taxonID	type	description	language	source
03A287B8FFE1FFA9FDD4D95DFB980736.taxon	type_taxon	Type species: Halictus anomalus Robertson 1892, by original designation and monotypy.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFA9FDD4D95DFB980736.taxon	diagnosis	Diagnosis Lasioglossum (Dialictus) are small bees (body length 3.1 – 8.1 mm) whose diagnosis on a global scale is somewhat problematic due to known exceptions to diagnostic characters. But on a regional scale, L. (Dialictus) can be reliably diagnosed from other Halictidae occurring on the Yucatán Peninsula by the combination of head and mesosoma dark (not brilliant) metallic blue, green, or golden, sometimes with red-brassy reflections; metasoma black, brown, or red; second and third fore wing submarginal crossveins weakened in the female; T 1 with well-developed setose fan in the female; inner metatibial spur of the female pectinate; and male clypeus apical margin black (not yellow).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	description	urn: lsid: zoobank. org: act: F 9897 B 79 - 0567 - 4 EAB- 802 A- 1 E 0 C 1 B 4 D 65 E 1 Figs 1, 5 A – B, 6 A, 7 – 8, 30 B, 36 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	diagnosis	Diagnosis Females of L. yucatanense sp. nov. can be recognized by the vertex and mesoscutum having very short, sparse pubescence, as if shaved (most noticeable in lateral view where most setae are separated by half or more their length); mesosoma entirely dulled by strong microsculpture; mesoscutum usually densely punctate laterad of parapsidal lines (i <1 pd) and sometimes partially shiny (especially posteromedially); mesepisternum strongly imbricate to finely rugulose with indistinct punctures at least in dorsal portion; tegula enlarged (reaching posterior margin of mesoscutum in dorsal view; tegula width / ITS> 0.23) and distinctly, densely punctate on lateral margins (i <1 pd), becoming more sparsely punctate medially (i ≥ 1 pd), sometimes densely punctate medially (i <1 pd); metapostnotum with fine rugae extending onto propodeum dorsolateral slope; discs of T 1 – T 2 with very fine, minute punctures, often hardly visible; and T 2 and usually T 3 apical impressed areas glabrous and impunctate. Males can be recognized by the same characters as females, except that the mesepisternum is shiny and distinctly and densely punctate (i <1 pd). Differential diagnosis Both sexes of L. yucatanense sp. nov. are most similar to Lasioglossum paxtoni sp. nov. and L. aureoviride sp. nov. and some members of the L. stictaspis species complex in the Yucatán Peninsula. They are also similar to the Nearctic species L. perparvum, which does not co-occur with L. yucatanense, and some undescribed species related to L. perparvum which may co-occur with L. yucatanense at the limits of its range. Both sexes of L. paxtoni have the tegula more finely and sparsely, sometimes inconspicuously punctate (i = 1 – 2 pd on lateral margins), mesonotum and mesoscutum shiny, mesoscutum finely and sparsely punctate (i = 1 – 3 pd) becoming slightly denser laterad of parapsidal lines (i = 1 – 2 pd); females also have the mesepisternum shiny, granular and finely, moderately densely punctate. Lasioglossum aureoviride females have the mesoscutum weakly tessellate and sparsely punctate between parapsidal lines (i = 1 – 3 pd), T 2 – T 3 apical impressed areas evenly covered with minute punctures and fine setae, head and mesosoma metallic dark turquoise-green with golden reflections on mesoscutum, and mesepisternum very densely punctate (i <0.5 pd). Both sexes of the L. stictaspis species complex have the mesoscutum with longer and denser pubescence (in lateral view all setae separated by less than half their length); females also have the mesepisternum usually imbricate and deeply, moderately densely punctate (i ≤ 1.5 pd) with distinct interspaces and T 2 – T 3 apical impressed areas usually with minute punctures or setae; males also usually have the mesepisternum more sparsely punctate (i = 1 – 2 pd). Females of L. perparvum have the mesepisternum distinctly punctate and T 2 – T 3 apical impressed areas with minute punctures; males have T 1 – T 2 with deep and distinct punctures often extending across premarginal line onto apical rim. Other undescribed species may have the tegula much larger (exceeding posterior margin of mesoscutum in dorsal view) and / or entirely densely punctate (i <1 pd); propodeum dorsolateral slope smooth without metapostnotal rugae; and / or mesepisternum shiny and distinctly punctate.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	etymology	Etymology The specific epithet refers to the Yucatán Peninsula region, Mexico where the species was discovered. The name was proposed by Manfred Stark who won a photo competition to name a species of bee at an event at the ZMH.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	materials_examined	Type material Holotype MEXICO – Yucatán • ♀; Nenela; [20.3364 ° N, 89.022 ° W]; 25 Oct. 2011; Quezada-Euán and MooValle leg.; original label 435.2; UNAM. Paratypes GUATEMALA – Huehuetenango • 1 ♀; Jacaltenango; 15.7167 ° N, 91.7455 ° W; elev. 1027 m; 28 Feb. 2010; César López leg.; ECOAB. 43352 • 1 ♀; La Democracia, Calauté; 15.571 ° N, 91.8496 ° W; elev. 915 m; 27 Apr. 2010; Jorge Mérida leg.; ECOAB. 43257 • 1 ♀; La Democracia, Camojaíto; 15.616 ° N, 91.8727 ° W; elev. 940 m; 1 Mar. 2010; Philippe Sagot leg.; ECOAB. 43199. MEXICO – Campeche • 1 ♂; Hopelchén; 19.58 ° N, 89.77 ° W; elev. 110 m; 25 Jan. 2016; Jesús López leg.; ECOAB. 82805. – Chiapas • 1 ♀; 3 km N of San Francisco Pujiltic, SW of Soyatitán; [16.3 ° N, 92.44 ° W]; elev. 710 m; 21 Apr. 1993; R. W. Brooks leg.; ex Bidens bipontina; SEMC SM 0341500 • 2 ♀♀; 3 km S of Palenque, Nututún; [17.485 ° N, 91.975 ° W]; elev. 40 m; 25 Apr. 1993; R. W. Brooks leg.; ex Bidens pilosa; SEMC SM 0341501, SM 0341502 • 5 ♂♂; same collection data as for preceding; SEMC SM 0341706 to SM 0341710 • 2 ♀♀; 5 mi S of Pichucalco; 17.4369 ° N, 93.1019 ° W; elev. 2137 – 2286 m; 13 Sep. 1974; George E. Bohart and W. J. Hanson leg.; BBSL 1101064, 1101065 • 2 ♂♂; same collection data as for preceding; BBSL 1101060, 1101061 • 51 ♀♀; 52.9 km N of Ocosingo Shanil; [17.2167 ° N, 92.1 ° W]; elev. 320 m; 23 Apr. 1993; R. W. Brooks leg.; ex Bidens; SEMC • 43 ♂♂; same collection data as for preceding; SEMC • 4 ♀♀; 52.9 km N of Ocosingo Shanil, near Agua Azul; 17.2167 ° N, 92.1 ° W; elev. 320 m; 23 Apr. 1993; E. Tovar leg.; ex Bidens pilosa; SEMC SM 0341611 to SM 0341614 • 4 ♀♀; Bonampak; [16.71 ° N, 91.06 ° W]; 23 – 26 Sep. 1977; W. D. Edmonds leg.; SEMC • 2 ♀♀; Estación Biológica Chajul, near Chajul; [16.113 ° N, 90.941 ° W]; elev. 200 m; 15 Apr. 1993; R. W. Brooks leg.; ex Oenothera sp.; SEMC SM 0341481, SM 0341482 • 1 ♂; same collection data as for preceding; SEMC SM 0341819 • 1 ♂; Ocosingo, El Rosario; 16.8859 ° N, 92.2742 ° W; elev. 1118 m; 15 Apr. 2010; Miguel Guzmán leg.; ECOAB. 43132 • 1 ♂; Ocosingo, San Francisco; 16.9156 ° N, 92.0483 ° W; elev. 922 m; 11 Feb. 2010; Miguel Cigarroa leg.; ECOAB. 43016 • 1 ♂; Ocozocoautla; 16.98 ° N, 93.54 ° W; elev. 985 m; 8 May 2016; Philippe Sagot leg.; ECOAB. 66283 • 2 ♂♂; Palenque; 17.5083 ° N, 91.9815 ° W; 10 Sep. 1974; George E. Bohart and W. J. Hanson leg.; BBSL 1101051 (photographed), 1101057 • 1 ♀; San Juan Cancuc, Chijil; 16.947 ° N, 92.4087 ° W; elev. 1095 m; 8 Apr. 2010; Carlos Balboa leg.; ECOAB. 43222 • 3 ♀♀; San Juan Cancuc, Tzuluwitz; 16.894 ° N, 92.4019 ° W; elev. 1270 m; 5 May 2009; Jorge Mérida, César López and T. López leg.; ECOAB. 42642, ECOAB. 42651, ECOAB. 42655 • 1 ♂; San Juan Cancuc, Tzumbal; 16.9394 ° N, 92.4434 ° W; elev. 1080 m; 6 Apr. 2010; Carlos Balboa leg.; ECOAB. 42996 • 1 ♂; Socoltenango; 16.17 ° N, 92.37 ° W; elev. 609 m; 14 Jan. 2017; Philippe Sagot leg.; ECOAB. 67384 • 1 ♂; Tzimol; 16.15 ° N, 92.32 ° W; elev. 617 m; 15 Jan. 2017; Philippe Sagot leg.; ECOAB. 67480. – Puebla • 8 ♂♂; 3 km S of Venustiano Carranza; [20.48 ° N, 97.67 ° W]; 30 Apr. 1984; J. C. Schaffner leg.; TAMU-ENTO X 1387389, X 1395191, X 1395942, X 1395974, X 1396008, X 1396057, X 1397280, X 1397583 • 1 ♀; 3 mi SW of Cuetzalán (N of Zacapoaxtla); [19.99 ° N, 97.56 ° W]; elev. 1250 m; 19 Jun. 1961; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; 5 mi E of Huauchinango; [20.18 ° N, 97.98 ° W]; elev. 1250 m; 25 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 3 ♂♂; same collection data as for preceding; SEMC • 2 ♀♀; N of Cuetzalan; 20.1042 ° N, 97.489 ° W; elev. 160 m; 4 Jul. 2011; Jason J. Gibbs leg.; WRME. – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC • 2 ♀♀; 49 km NE of Felipe Carrillo Puerto; [19.89 ° N, 87.71 ° W]; 11 Oct. 1986; Charles D. Michener leg.; SEMC • 3 ♂♂; Felipe Carrillo Puerto; 19.35 ° N, 88.03 ° W; 10 – 14 Oct. 1986; F. D. Parker leg.; BBSL 1100926, 1100927, 1100931 • 2 ♀♀; same collection data as for preceding; 10 – 14 Oct. 1986; BBSL 1100919, 1100932 • 4 ♀♀; Reforma; [18.81 ° N, 88.57 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC • 14 ♂♂; Xcan; [20.87 ° N, 87.6 ° W]; 31 Jul. 1962; A. B. Amerson Jr. leg.; SEMC. – San Luis Potosi • 1 ♀; 12 km NW of El Naranjo; [22.59 ° N, 99.38 ° W]; elev. 400 m; 5 Jul. 1990; Robert L. Minckley leg.; SEMC • 1 ♀; 2 mi NE of El Salto falls; [22.61 ° N, 99.36 ° W]; 21 Jul. 1962; Ellen Ordway Roberts leg.; ex Helenium sp.; SEMC • 8 ♀♀; 20 mi NE of Ciudad del Maíz; [22.61 ° N, 99.38 ° W]; elev. 914 m; 19 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 8 ♀♀; 3.4 mi NE of El Naranjo; [22.56 ° N, 99.3 ° W]; elev. 244 m; 5 Sep. 1962; University of Kansas Mexico Expedition leg.; SEMC • 6 ♂♂; same collection data as for preceding; SEMC • 2 ♀♀; 30 mi NE of Ciudad del Maíz; [22.7 ° N, 99.27 ° W]; elev. 396 m; 19 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; 9 mi S of Ciudad Valles; [21.9 ° N, 98.92 ° W]; elev. 183 m; 2 Sep. 1962; University of Kansas Mexico Expedition leg.; SEMC • 2 ♀♀; El Meco (near El Salto Falls); [22.57 ° N, 99.35 ° W]; elev. 350 m; 5 Jul. 1990; Ilan Yarom leg.; SEMC • 25 ♀♀; El Salto; [22.59 ° N, 99.38 ° W]; elev. 549 m; 8 Jun. 1961; University of Kansas Mexico Expedition leg.; ex Kallstroemia hirsutissima; SEMC • 13 ♀♀; same collection data as for preceding; SEMC • 1 ♂; same collection data as for preceding; SEMC • 3 ♂♂; same collection data as for preceding; SEMC • 1 ♀; El Salto Falls; [22.59 ° N, 99.38 ° W]; elev. 400 m; 4 Jul. 1990; Ilan Yarom leg.; SEMC • 1 ♂; same collection data as for preceding; 5 Jul. 1990; SEMC • 1 ♀; Pujal; [21.85 ° N, 98.94 ° W]; 20 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; Tamazunchale; [21.26 ° N, 98.79 ° W]; 18 Jun. 1937; SEMC • 2 ♀♀; Xilitla; [21.385 ° N, 98.975 ° W]; elev. 442 m; 23 Jul. 1954; University of Kansas Mexico Expedition leg.; SEMC • 4 ♂♂; same collection data as for preceding; SEMC. – Tabasco • 1 ♀; 2 mi SW of Frontera; [18.51 ° N, 92.67 ° W]; 7 Sep. 1968; Veryl V. Board leg.; TAMU-ENTO X 1313226 • 1 ♂; same collection data as for preceding; TAMU-ENTO X 1313330 • 1 ♂; Villahermosa; [17.99 ° N, 92.95 ° W]; Oct. 1954; N. L. H. Krauss leg.; SEMC. – Tamaulipas • 1 ♀; 10 km W of Antiguo Morelos, Highway 80; [22.555 ° N, 99.167 ° W]; elev. 470 m; 6 Jul. 1990; Ilan Yarom leg.; SEMC • 1 ♂; 6 mi W of Gómez Farías; [22.89 ° N, 99.12 ° W]; 5 Jul. 1986; J. C. Schaffner and Kovarik leg.; TAMU-ENTO X 1413144 • 1 ♀; El Limón; [22.82 ° N, 99.01 ° W]; 17 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 2 ♂♂; same collection data as for preceding; SEMC • 3 ♀♀; Gómez Farías; 23.0475 ° N, 99.1556 ° W; 14 Feb. 2001; Douglas Yanega leg.; UCRC ENT 49797 to ENT 49799 • 5 ♀♀; Padilla; [24.05 ° N, 98.9 ° W]; 15 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC • 1 ♀; W of Gómez Farías; [23.03 ° N, 99.16 ° W]; 15 Nov. 1985; P. W. Kovarik, Jones and Haack leg.; TAMU-ENTO X 1414798. – Veracruz • 5 ♀♀; 12 mi NW of San Andrés Tuxtla; [18.56 ° N, 95.32 ° W]; elev. 335 m; 24 Jun. 1961; University of Kansas Mexico Expedition leg.; SEMC • 1 ♀; 15 mi W of Tlapacoyan; 19.8232 ° N, 97.2246 ° W; 28 Feb. 1972; F. D. Parker and D. Miller leg.; BBSL 1101047 • 1 ♀; 15 mi W of Veracruz; [19.17 ° N, 96.36 ° W]; elev. 15 m; 30 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 4 ♀♀; 17 mi NW of San Andrés Tuxtla; [18.545 ° N, 95.39 ° W]; elev. 274 m; 24 Jun. 1961; University of Kansas Mexico Expedition leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC • 2 ♀♀; 2 mi N of Jesús Carranza (Isthmus of Tehuantepec); [17.47 ° N, 95.03 ° W]; elev. 46 m; 25 Jun. 1961; University of Kansas Mexico Expedition leg.; SEMC • 2 ♀♀; 3 mi SW of Paso del Toro; [19 ° N, 96.17 ° W]; elev. 15 m; 23 Jun. 1961; University of Kansas Mexico Expedition leg.; ex Porophyllum; SEMC • 2 ♀♀; same collection data as for preceding; SEMC • 1 ♀; 32 km N of Catemaco, UNAM Preserve; [18.58 ° N, 95.07 ° W]; 4 Jan. 1982; John W. Wenzel leg.; SEMC • 1 ♀; same collection data as for preceding; 9 Jan. 1982; E. M. May leg.; SEMC • 4 ♀♀; 34 km SE of Catemaco, 1 km along road to Montepio; [18.21 ° N, 94.88 ° W]; 3 Jan. 1982; B. H. Smith leg.; SEMC • 4 ♀♀; 4 mi W of Puente Nacional; [19.32 ° N, 96.55 ° W]; elev. 274 m; 22 Jun. 1961; University of Kansas Mexico Expedition leg.; ex Kallstroemia hirsutissima; SEMC • 1 ♂; 5 mi SW of Tlapacoyan; [19.91 ° N, 97.27 ° W]; elev. 853 m; 26 Jun. 1953; University of Kansas Mexico Expedition leg.; SEMC • 3 ♂♂; 7 mi NW of Alazán, near Tuxpan; [21.16 ° N, 97.81 ° W]; 11 Jun. 1961; University of Kansas Mexico Expedition leg.; ex Lippia sp.; SEMC • 2 ♂♂; Alazán; 21.0917 ° N, 97.7255 ° W; 27 Feb. 1972; F. D. Parker and D. Miller leg.; BBSL 1101044, 1101045 • 1 ♀; Balzapote, NE of Estación Los Tuxtlas; [18.62 ° N, 95.07 ° W]; 17 Sep. 1987; A. L. Norrbom leg.; USNM • 1 ♀; Boca del Río; [19.11 ° N, 96.11 ° W]; elev. 8 m; 23 Jun. 1961; University of Kansas Mexico Expedition leg.; ex Acacia; SEMC • 1 ♀; Huatusco; 19.1734 ° N, 96.9724 ° W; 11 Jan. 2007; Sam W. Droege leg.; PCYU USGS-DRO 074912 • 1 ♂; Veracruz; [19 ° N, 96 ° W]; 1959; N. L. H. Krauss leg.; USNM. – Yucatán • 1 ♀; 6 km E of Uxmal; [20.36 ° N, 89.71 ° W]; 6 Apr. 1997; R. W. Brooks leg.; ex Vitex gaumeri; SEMC SM 0105999 • 1 ♂; Xmatkuil, 15 km S of Mérida; [20.86 ° N, 89.62 ° W]; 13 Feb. 1987; Charles D. Michener leg.; SEMC • 1 ♀; Chichén-Itzá; [20.68 ° N, 88.57 ° W]; 11 Jan. 1976; L. Greenberg leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC • 2 ♂♂; Chichén-Itzá ruins (near Piste); [20.68 ° N, 88.57 ° W]; 15 Feb. 1987; Charles D. Michener leg.; SEMC • 2 ♀♀; Kabah, 25 km SW of Ticul; [20.25 ° N, 89.65 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC • 4 ♂♂; same collection data as for preceding; SEMC • 2 ♂♂; San Simón Pueblo; 20.2159 ° N, 89.8098 ° W; 22 Jan. 1981; George E. Bohart leg.; BBSL 1101107, 1101108 • 1 ♀; Timul; 20.3156 ° N, 88.9322 ° W; 9 Jun. 2011; José J. G. Quezada-Euán and Humberto Moo-Valle leg.; original label 300 C 2; ZMH 842012 • 1 ♀; same collection data as for preceding; original label 300 d; ZMH 842013. Other material examined MEXICO – Guerrero • 1 ♀; Acapulco; [16.9 ° N, 99.9 ° W]; Baker leg.; USNM. – Jalisco • 1 ♀; Careyes; 19.4289 ° N, 105.0274 ° W; 12 Feb. – 19 Mar. 1997; F. D. Parker leg.; BBSL 1100768. – Yucatán • 1 ♀; Nenela; [20 ° 20 ′ 10.90 ″ N, 89 ° 1 ′ 19.20 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 344 a; ZMH 842014 • 1 ♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 602 C; ZMH 81028 • 1 ♂; Nenela; [20 ° 20 ′ 10.90 ″ N, 89 ° 01 ′ 19.20 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 68 a; ZMH 81027 • 1 ♀; Timul; [20 ° 18 ′ 56.1 ″ N, 88 ° 55 ′ 55.9 ″ W]; 9 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 300 a; ZMH 839500 • 1 ♀; Nenela; [20 ° 15 ′ 10.0 ″ N, 89 ° 05 ′ 24.5 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 65 a 1; ZMH 842000 • 1 ♀; Nenela; [20 ° 15 ′ 10.0 ″ N, 89 ° 05 ′ 24.5 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 65 a 2; ZMH 842001 • 1 ♀; Nenela; [20 ° 15 ′ 10.0 ″ N, 89 ° 05 ′ 24.5 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 68 c; ZMH 842002 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 77; ZMH 842003 • 1 ♀; Moctezuma; [21 ° 24 ′ 46.2 ″ N, 87 ° 42 ′ 05.7 ″ W]; 30 May 2011; Quezada-Euán and Moo-Valle leg.; original label 148; ZMH 842004 • 1 ♀; Moctezuma; [21 ° 24 ′ 46.2 ″ N, 87 ° 42 ′ 05.7 ″ W]; 30 May 2011; Quezada-Euán and Moo-Valle leg.; original label 153; ZMH 842005 • 1 ♀; San Pedro Bacab; [21 ° 18 ′ 04.9 ″ N, 087 ° 38 ′ 24.8 ″ W]; 31 May 2011; QuezadaEuán and Moo-Valle leg.; original label 169; ZMH 842006 • 1 ♀; San Pedro Bacab; [21 ° 18 ′ 04.9 ″ N, 087 ° 38 ′ 24.8 ″ W]; 31 May 2011; Quezada-Euán and Moo-Valle leg.; original label 173; ZMH 842007 • 1 ♀; Rancho Alegre; [21 ° 18 ′ 26.7 ″ N, 87 ° 46 ′ 29.6 ″ W]; 13 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 213; ZMH 842008 • 1 ♀; same collection data as for preceding; original label 216; ZMH 842009 • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 6 Jun. 2011; Quezada-Euán and MooValle leg.; original label 240 a; ZMH 842010 • 1 ♀; Timul; [20 ° 18 ′ 56.1 ″ N, 88 ° 55 ′ 55.9 ″ W]; 9 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 299 e; ZMH 842011 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 432.1; ZMH 842015 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 433 a; ZMH 842016 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 433 b; ZMH 842017 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 435; ZMH 842018 • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 6 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 473; ZMH 842019 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 488 a 2; ZMH 842020 • 1 ♀; Muna; [20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W]; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 569 d; ZMH 842021 • 1 ♀; Santa María; [20 ° 23 ′ 32.5 ″ N, 88 ° 55 ′ 14.6 ″ W]; 26 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 587 f; ZMH 842022 • 1 ♀; same collection data as for preceding; original label 590 a; ZMH 842023 • 1 ♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 1 Aug. 2011; Quezada-Euán and MooValle leg.; original label 603 a; ZMH 842024 • 1 ♀; Timul; [20 ° 18 ′ 56.1 ″ N, 88 ° 55 ′ 55.9 ″ W]; 9 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 300 d; ZMH 842013. Floral records ASTERACEAE Giseke: Bidens L.: B. bipontina Sherff • B. pilosa L. • Helenium L. • Porophyllum Guett. • FABACEAE Juss.: Acacia Mill. • LAMIACEAE Martinov: Vitex L.: V. gaumeri Greenm. • ONAGRACEAE Juss.: Oenothera L. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. • VERBENACEAE J. St. - Hil.: Lippia L. • ZYGOPHYLLACEAE R. Br.: Kallstroemia Scop.: K. hirsutissima Vail. DNA barcodes Thirty sequences available, two haplotypes (BOLD process IDs: LDSPS 002 - 15 to LDSPS 008 - 15, LDSPS 010 - 15 to LDSPS 028 - 15 (haplotype 1); DLII 504 - 07, DLIII 127 - 18, DLIII 137 - 19, DLIII 138 - 19 (haplotype 2). The holotype GenBank accession number: KU 574888. BOLD process ID: LDSPS 009 - 15. Haplotype 1 is morphologically and genetically similar to haplotype 2 with a large number of sequences available (consistent with the relative abundance of specimens of L. yucatanense sp. nov.). The sequences are highly variable (maximum intraspecific p-distance between haplotypes 3.53 %; within haplotype 1 intraspecific p-distance 0.54 %; minimum interspecific p-distance (to L. paxtoni sp. nov.) 2.89 %). Two reasons that may influence the high intraspecific variation are the existence of cryptic species throughout the distribution of these taxa and problems in the quality of the sequence data for the Yucatán specimens.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	description	Description Female (holotype) MEASUREMENTS. Length 3.88 mm; head length 1.08 mm; head width 1.14 mm; forewing length 3.1 mm; 14 female paratypes measured: length 3.88 – 4.91 mm; head length 1.08 – 1.18 mm; head width 1.14 – 1.24 mm; fore wing length 2.85 – 4.96 mm. COLOUR. Head and mesosoma dark metallic green with copper-red reflections on mesoscutum; clypeus basally metallic green and apically black; scape and pedicel dark brown; F 1 – F 10 dark brown dorsally, light brown ventrally; tegula dark reddish brown; wing membrane subhyaline, venation and pterostigma reddish brown; legs black with tarsal segments light brown; metasoma black with apical rims of terga and sterna dark brown. PUBESCENCE. Light yellow. Head and mesosoma with abundant setae (1 – 2 OD), very short and sparse on vertex and mesoscutum (i ≤ 1 OD), most setae on mesoscutum separated by half their length or more in lateral view and subappressed setae little more than stubble, appearing shaved; lower paraocular area with sparse subappressed tomentum and gena with sparse erect setae; propodeum with plumose setae on lateral and posterior surfaces, more scattered on the latter (2 – 2.5 OD); T 1 with dense complete setose fan; T 2 – T 3 with small and short basolateral patches of appressed tomentum covering less than half length of segment and usually apical rims glabrous and impunctate; discs of T 2 – T 6 with sparse, short, simple setae; apical impressed areas glabrous except T 3 – T 4 with sparse apicolateral setae. SURFACE SCULPTURE. Clypeus and supraclypeal area shiny and moderately densely punctate (i = 1 – 2 pd); lower paraocular area shiny and densely punctate (i ≤ 1 d); antennocular area imbricate and densely punctate (i ≤ 1 pd); upper paraocular area, frons, and ocellocular area shiny and densely punctate (i <1 d); gena and postgena lineate; tegula larteral margin with deep, distinct, and dense punctures (i <1 d) slightly larger than mesoscutum punctures, sparse medially (i = 1 – 3 pd); mesoscutum tessellate and finely and densely punctate laterad of parapsidal lines (i ≤ 1 pd), becoming sparse and obscure anteromedially (i = 1 – 3 pd); mesoscutellum tessellate and coarsely, irregularly, sparsely punctate (i = 1 – 5 pd); axilla similar to mesoscutellum; metanotum finely rugulose-punctate; mesepisternum strongly imbricate to finely rugulose and densely punctate (i ≤ 1 pd), punctures shallow and indistinct on ventral half and dorsal margin; metepisternum finely rugulose; metapostnotum dull, finely reticulate with fine subparallel rugae reaching posterior margin; propodeum dorsolateral slope strigate; discs of metasomal terga shiny to finely coriarious with minute, shallow, sparse punctures (i = 1 – 4 pd); apical impressed areas impunctate; T 2 and usually T 3 apical rims impunctate; metasomal terga polished from T 4 – T 6 with irregularly distributed punctures. STRUCTURE. Head wide (length / width ratio = 0.95 – 0.98; holotype = 0.95); eyes weakly convergent below (UOD / LOD ratio = 1.25 – 1.35; holotype = 1.35); apicolateral margins of clypeus strongly convergent; antennal sockets close (IAD / AOD = 0.57 – 0.7); frontal line ending 2.5 OD below median ocellus; gena narrower than eye; inner metatibial spur pectinate with four teeth; tegula relatively large, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight, more bean-shaped; scutellum length 0.23; metapostnotum length 0.2, metapostnotum moderately elongate (MMR ratio = 1.15), posterior margin sharply angled onto posterior surface; propodeum with oblique carina, lateral carina nearly reaching margin of dorsal surface. Male MEASUREMENTS. Length 3.60 – 3.80 mm; head length 1.05 – 1.18 mm; head width 1.11 – 1.48 mm; fore wing length 2.57 – 3.03 mm. COLOUR. Head and mesosoma dark metallic blue-green with copper-red reflections on mesoscutum; antenna dorsal side dark brown and ventral side light brown; tegula dark brown; wing membrane light brownish, venation and pterostigma brown; legs dark brown; metasoma black with apical rims of terga and sterna dark brown. PUBESCENCE. Light brown. Head with abundant setae (0.5 – 1 OD), more abundant, forming dense tomentum in paraocular and supraclypeal areas; gena with sparse setae; mesoscutum with sparse plumose setae 0.5 – 1 OD long (most setae separated by half their length or more in lateral view, especially in posterior half); propodeum with plumose setae on lateral and posterior surfaces, sparser on the latter (0.5 – 1 OD); discs of metasomal terga with sparse short setae; apical impressed areas impunctate; T 2 – T 3 basolateral margins with a few sparse tomentose setae. SURFACE SCULPTURE. Clypeus, supraclypeal area, paraocular area, and ocellocular area shiny and densely punctate (i <1 pd); frons dull with crowded punctures (i = 0 pd); gena and postgena lineolate; tegula lateral margin with deep, distinct, and dense punctures (i <1 d) slightly larger than mesoscutal punctures, moderately dense medially (i = 1 – 2 pd); mesoscutum shiny to weakly tessellate and densely punctate (i ≤ 1 pd), becoming more strongly tessellate and slightly sparser anteromedially (i = 1 – 2 pd); mesoscutellum shiny to weakly tessellate and densely punctate (i ≤ 1 pd); metanotum rugulose; mesepisternum shiny and densely punctate (i <1 pd); metepisternum rugulose; propodeum with dorsolateral slope strigate, metapostnotum somewhat shiny, finely and weakly reticulate with strong subparallel rugae; metasomal terga shiny with minute, shallow, sparse punctures (i = 1 – 4 pd). STRUCTURE. Head wide (length / width ratio = 0.94 – 0.98). Eyes weakly convergent below (UOD / LOD ratio = 1.65 – 1.69); antennal sockets slightly separated (IAD / AOD <1.07); frontal line ending 2.5 OD below median ocellus; tegula relatively large, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight or concave; scutellum length 0.22; metapostnotum length 0.19, metapostnotum elongate (MMR ratio = 1.16), posterior margin sharply angled onto posterior surface; genitalia with penis valve short, delicate and thin; retrorse lobe of genital capsule of median size and width, gonostylus small, fine and rounded, with a few short, simple setae near apex; S 7 – S 8 median processes narrow.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	distribution	Distribution Widely dispersed throughout the eastern lowlands of Mexico from Tamaulipas to Yucatán and Chiapas and in northwestern Guatemala. Two outliers from Jalisco and Guerrero are morphologically indistinguishable from the eastern specimens; it is unclear whether these represent long-range dispersal events, a natural range extension, or a cryptic species.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFE1FFB1FEE8DF63FDE501E9.taxon	discussion	Remarks Very common. Specimens of both DNA barcode haplotypes are morphologically indistinguishable, but geographically separate. All haplotype 1 sequences are from Yucatán while haplotype 2 is from Puebla, Veracruz, and Chiapas. It is possible that these represent cryptic species; however, the geographic separation disappears when considering all available specimens (with barcodes or not). Yet, the variation between haplotypes could be reinforced, mainly when considering genetic variation, following the findings from other species of bees and insects in the region (Landaverde-González et al. 2020; Urueña et al. 2022). Thus, in order to be conservative, it is inadvisable to consider a two-species hypothesis at this time. This species is a member of the L. gemmatum species complex and corresponds to mOTU 1 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	description	urn: lsid: zoobank. org: act: 8 AB 32 A 78 - 9274 - 49 AE-B 9 CA- 3 D 2 BF 1 A 925 BE Figs 5 C – D, 6 B, 9 – 10, 28 A, 29 A, 30 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	diagnosis	Diagnosis Females of L. paxtoni sp. nov. can be recognised by having the vertex and mesoscutum with very short, sparse pubescence as if shaved (most noticeable in lateral view where most setae are separated by half or more their length); tegula enlarged (reaching posterior margin of mesoscutum in dorsal view; tegula width / ITS 0.21 – 0.22) and lateral margin with shallow, minute, and sparse punctures (i = 1 – 2 d) no larger than mesoscutum punctures (sometimes inconspicuous and tegula nearly impunctate); mesoscutum shiny, finely and sparsely punctate (i = 1 – 3 pd), becoming slightly denser laterad of parapsidal lines (i = 1 – 2 pd), and with distinct red – brassy reflections medially; mesepisternum shiny, granular and finely, moderately densely punctate (i = 1 – 1.5 pd); metapostnotum with fine rugae extending onto propodeum dorsolateral slope; discs of T 1 – T 2 with very fine, minute punctures, often hardly visible; and T 2 and usually T 3 apical impressed areas glabrous and impunctate. Males can be recognized by the same characters, except that the mesoscutum color is less red and more brassy, and the mesepisternum is more densely punctate (i <1 pd), the mesoscutum has sparse plumose setae 0.5 – 1 OD long (most setae separated by half their length or more in lateral view, especially in posterior half). Differential diagnosis Both sexes of L. paxtoni sp. nov. are most similar to L. yucatanense sp. nov., L. (D.) aureoviride sp. nov., specimens of the Lasioglossum stictaspis species complex, the Nearctic species L. perparvum, and some undescribed species related to L. perparvum which are not known to co-occur with L. paxtoni. See the differential diagnosis for L. yucatanense for characters separating these species. Lasioglossum (D.) aureoviride has the mesoscutum weakly tessellate and sparsely punctate between the parapsidal lines (i = 1 – 3 pd) and with dense erect setae ~ 1 OD long (all setae separated by less than half their length in lateral view); T 2 – T 3 apical rims evenly covered with fine setae and / or punctures; mesoscutum with dense erect setae ~ 1 OD long and subappressed setae 0.25 – 0.5 OD long; mesepisternum imbricate and very densely punctate (i <0.5 pd). Specimens of Lasioglossum stictaspis species complex have the mesepisternum imbricate and deeply, moderately densely punctate (i ≤ 1.5 pd) with distinct interspaces, T 2 – T 3 apical rims evenly covered with fine setae and / or punctures. Females of L. perparvum have the scutum olive green with no red reflections, tarsi dark brown, scutum tessellate, mesepisternum tessellate with indistinct punctures, and T 2 – T 3 with extensive basolateral fine tomentum covering about half length of segment laterally and apical impressed areas minutely punctate with fine setae associated with punctation. One undescribed species from western Veracruz labeled as L. sp. mex 9 on BOLD is especially similar to L. paxtoni sp. nov., but lacks copper-red reflections on the mesoscutum and the tegula is more deeply and distinctly (but still sparsely) punctate. This species is apparently restricted to high elevations in the Sierra Madre Oriental mountains, in contrast to L. paxtoni which is restricted to the Yucatán Peninsula and northern Chiapas.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	etymology	Etymology The specific epithet is in dedication to Prof Robert Paxton, the PhD advisor of PLG and JQE.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	materials_examined	Type material Holotype MEXICO – Yucatán • ♀; Yaxnic; [20.79 ° N, 89.62 ° W]; 8 Apr. 1997; R. W. Brooks, H. Delphin, H. Contreras and U. Mao leg.; ex Momordica charantia; SEMC SM 0106374. Paratypes MEXICO – Campeche • 1 ♂; 10 mi N of Hopelchén; [19.89 ° N, 89.84 ° W]; 17 Apr. 1962; L. A. Stange leg.; UCDC. – Chiapas • 1 ♀; San Juan Cancuc, Tzajalchén; 16.9474 ° N, 92.3578 ° W; elev. 1020 m; 4 Feb. 2010; Philippe Sagot leg.; ECOAB. 43220 • 1 ♂; same collection data as for preceding; ECOAB. 43235 • 1 ♀; San Juan Cancuc, Tzuluwitz; 16.894 ° N, 92.4019 ° W; elev. 1270 m; 5 May 2009; Jorge Mérida, César López and T. López leg.; ECOAB. 42654. – Quintana Roo • 2 ♂♂; Xcan; [20.87 ° N, 87.6 ° W]; 31 Jul. 1962; A. B. Amerson Jr. leg.; SEMC. – Yucatán • 1 ♂; Xmatkuil, 15 km S of Mérida; [20.86 ° N, 89.62 ° W]; 13 Feb. 1987; Charles D. Michener leg.; SEMC • 2 ♀♀; Mérida; [20.97 ° N, 89.59 ° W]; Nov. 1961; N. L. H. Krauss leg.; SEMC • 1 ♀; Mérida, 15 km S of University of Yucatán; [20.83 ° N, 89.62 ° W]; 7 Apr. 1997; R. W. Brooks leg.; ex Piscidia piscipula; SEMC SM 0105915 • 1 ♂; Yaxnic; [20.79 ° N, 89.62 ° W]; 8 Apr. 1997; R. W. Brooks, H. Delphin, H. Contreras and U. Mao leg.; ex Momordica charantia; SEMC SM 0106372 (photographed). Other material examined MEXICO – Yucatán • 1 ♀; Alfonso Caso; 20.084 ° N, 89.1609 ° W; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 842027 • 1 ♂; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 38 b; ZMH 81029 • 1 ♀; Santa María; [20 ° 23 ′ 32.5 ″ N, 88 ° 55 ′ 14.6 ″ W]; 26 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 587 e; ZMH 81040 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 81; ZMH 842025 • 1 ♀; same collection data as for preceding; original label 87; ZMH 842026 • 1 ♀; same collection data as for preceding; original label 91; ZMH 842027 1 ♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 1 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 602 c; ZMH 842029 • 1 ♀; same collection data as for preceding; original label 86; UADY. Floral records CUCURBITACEAE Juss.: Momordica L.: M. charantia L. • FABACEAE Juss.: Piscidia: P. piscipula (L.) Sarg. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes Five sequences available (BOLD process IDs: LDSPS 029 - 15 to LDSPS 033 - 15). The attribution of these sequences to L. paxtoni sp. nov. is based on their genetic similarity to the undescribed L. sp. mex 9, which is morphologically similar to the description of L. paxtoni (unfortunately the specimen originally designated as a holotype was destroyed), and the small number of available sequences (consistent with the low relative abundance of L. paxtoni). The sequences are variable and distinguished from those of other species (maximum intraspecific p-distance 0.82 %; minimum interspecific p-distance (to L. yucatanense sp. nov.) 2.89 %).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	description	Description Female (holotype) MEASUREMENTS. Length 3.75 mm; head length 1.05 mm; head width 1.08 mm; fore wing length 2.43 mm. Five female paratypes measured: length 3.75 – 4.4 mm; head length 1.05 – 1.11 mm; head width 1.08 – 1.17 mm; forewing length 2.43 – 3.21 mm. COLOUR. Head and mesosoma metallic blue-green with red-brassy reflections dorsally; scape and pedicel dark brown; F 1 – F 10 dark brown dorsally, orange-brown ventrally; tegula orange-brown; wing membrane subhyaline, venation and pterostigma dark brown; legs dark brown with tarsi lighter orangebrown; metasoma dark brown. PUBESCENCE. Light yellow; head and mesosoma with moderately abundant setae (1 – 2 OD), very short and sparse on vertex, gena, and mesoscutum (<1 OD); lower paraocular area with sparse subappressed tomentum; propodeum with plumose long setae (2 – 2.5 OD) on lateral and posterior surfaces, in the latter sparser; T 1 with sparse complete setose fan; T 1 – T 6 evenly covered with very short, sparse, simple setae, except T 1 – T 2 apical impressed areas glabrous, tarsal segments with plumose, light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and moderately densely punctate (i = 1 – 2 pd); supraclypeal area shiny and sparsely punctate (i = 1 – 3 d); paraocular area shiny and densely punctate (i ≤ 1 pd); frons dull with very fine crowded punctures (i = 0 pd); ocellocular area shiny and moderately sparsely punctate (i = 1 – 2 pd); gena and postgena lineate; tegula lateral margin with a few shallow, minute, and sparse punctures (i = 1 – 2 d), otherwise impunctate; mesoscutum shiny and sparsely punctate medially (i = 1 – 3 pd), becoming moderately dense laterad of parapsidal lines and posteromedially (i = 1 – 1.5 pd); mesoscutellum weakly tessellate and moderately sparsely punctate (i = 1 – 2 pd); axilla similar to mesoscutellum; metanotum very finely rugulose; mesepisternum granular, shiny and moderately fine and densely punctate (i = 1 – 1.5 d); metepisternum very finely rugulose; metapostnotum reticulate with fine subparallel rugae reaching posterior margin; propodeum lateral and posterior surface finely reticulate; discs of metasomal terga weakly coriarious and very minutely, sparsely, obscurely punctate (i = 2 – 4 pd); apical impressed areas impunctate; T 2 and usually T 3 apical rims impunctate. STRUCTURE. Head square (length / width ratio = 0.99 – 1.01; holotype: 1.0); eyes weakly convergent below (UOD / LOD ratio = 1.29 – 1.31; holotype = 1.33); clypeus ½ below suborbital tangent; antennal sockets close (IAD / AOD = 0.53 - 0.65), frontal line ending 2.5 OD below median ocellus; gena wider than eye; inner metatibial spur pectinate with 2 – 3 teeth; tegula relatively large, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight, more bean-shaped; scutellum length 0.22; metapostnotum length 0.15, metapostnotum moderately elongate (MMR ratio = 1.47), weakly rounded posteriorly; propodeum with oblique carina, lateral carina nearly reaching margin of dorsal surface. Male MEASUREMENTS. Length 3.53 – 3.85 mm; head length 0.86 – 1.01 mm; head width 0.95 – 1.18 mm; fore wing length 2.02 – 2.58 mm. COLOURATION. Head and mesosoma dark turquoise-green to olive green with brassy-gold reflections dorsally; antenna dark brown dorsally, orange-brown ventrally; wing membrane subhyaline, venation and pterostigma dark brown; legs dark brown with tarsi lighter orange-brown; metasoma dark brown. PUBESCENCE. Light yellowish; head and mesosoma with moderately abundant setae (1 – 2 OD), very short and sparse on vertex and mesoscutum (<1 OD); lower paraocular area with dense subappressed tomentum; mesoscutum with sparse plumose setae 0.5 – 1 OD long (most setae separated by half their length or more in lateral view, especially in posterior half); propodeum with short plumose setae on lateral and posterior surfaces (0.5 – 1 OD); discs of metasomal terga covered with sparse, short, simple setae. SURFACE SCULPTURE. Clypeus, supraclypeal area, and lower paraocular area shiny and densely punctate (i ≤ 1 pd), upper paraocular area and frons shiny with crowded punctures (i = 0 pd), ocellocular area shiny and densely punctate (i ≤ 1 pd); gena and postgena lineate; mesoscutum shiny and sparsely punctate (i = 1 – 3 pd), becoming slightly denser laterad of parapsidal lines (i = 1 – 2 pd); mesoscutellum shiny and moderately densely punctate (i = 1 – 2 pd); tegula sparsely punctate (i = 2 – 4 pd), more sparse medially (i> 1.5 dp), sometimes inconspicuous and tegula nearly impunctate; mesepisternum granular, shiny and densely punctate (i <1 – 1.5 pd); propodeum lateral surface finely reticulate, posterior surface shiny and moderately densely punctate (i = 1 – 2 pd); discs of T 1 – T 3 shiny and moderately sparsely punctate (i = 1 – 3 pd) sometimes impuctate; apical impressed areas and discs of T 4 – T 6 impunctate. STRUCTURE. Head slightly long (length / width ratio = 1.01 – 1.04); eyes weakly convergent below (UOD / LOD ratio = 1.29 – 1.62); clypeus ½ below suborbital tangent; antennal sockets slightly close (IAD / AOD <1.42); frontal line ending 2.5 OD below median ocellus; gena narrower than eye; tegula relatively large, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight or concave; scutellum length 0.19; metapostnotum length 0.15, metapostnotum elongate (MMR ratio = 1.27), weakly rounded onto posterior surface; propodeum with lateral carina not reaching margin of dorsal surface; genitalia with penis valve small and delicate, retrorse lobe small, gonostylus of medium size and with a few short, simple setae near apex; S 7 median process narrow; S 8 median process wide.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	distribution	Distribution Only known from the Yucatán Peninsula and northern Chiapas.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF9FFB4FE0DD9A1FAFA01A9.taxon	discussion	Remarks Rare and apparently geographically restricted to the Yucatán Peninsula. This species is a member of the L. gemmatum species complex and corresponds to mOTU 2 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFFCFFBAFDBED9E1FB4D0632.taxon	description	Figs 6 C, 11 – 12, 22 C, 31 A Ten specimens and six DNA barcode sequences were examined from the Yucatán Peninsula which belong to a complex of species related to L. stictaspis (Sandhouse, 1923). Morphological variation suggests that this complex may include up to 5 – 6 cryptic species, but overlapping geographic ranges and COI haplotypes preclude delimitation of these species. Further revision, including more robust genetic data beyond DNA barcodes and across a large geographic area, is needed. The Yucatán specimens appear to be distinct from the nominal L. stictaspis, but separating them from L. cupreicollis (Friese, 1917) and other undescribed morphospecies is difficult and beyond the scope of this study. Here we diagnose briefly the Yucatán morphospecies in the L. stictaspis species complex from other species on the Yucatán Peninsula.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFFCFFBAFDBED9E1FB4D0632.taxon	diagnosis	Diagnosis Females of the L. stictaspis species complex in the Yucatán Peninsula can be recognised by the diagnostic combination of tegula greatly enlarged (reaching posterior margin of mesoscutum in dorsal view and tegula width / ITS> 0.23) and densely, distinctly punctate (i <1 pd), sometimes becoming more sparsely punctate medially (i ≤ 1.5 pd); mesepisternum usually imbricate and moderately densely punctate (i ≤ 1.5 pd) with distinct interspaces; mesoscutum with dense plumose setae 1 OD long or slightly more (all setae separated by less than half their length in lateral view); T 2 – T 3 with extensive basolateral fine tomentum covering about half length of segment laterally and apical impressed areas minutely punctate with fine setae associated with punctation. Males have the tegula large and densely punctate (as in the female, but punctures not becoming sparser medially); mesepisternum shiny and moderatly sparsely punctate at least in ventral half (i = 1 – 2 pd); and mesoscutum with dense plumose setae about 1 OD long (as in the female). Differential diagnosis Both sexes of the L. stictaspis species complex are most similar to L. yucatanense sp. nov., L. paralepidii sp. nov., and L. aureoviride sp. nov. Both sexes of L. yucatanense have the mesoscutum with sparser, shorter setae (most setae separated by half or more their length in lateral view); females of L. yucatanense also have the mesepisternum strongly imbricate to finely rugulose with indistinct punctures at least in dorsal portion and T 2 – T 3 apical impressed areas largely glabrous; males of L. yucatanense have the mesepisternum shiny and densely and distinctly punctate (i <1 pd). Both sexes of L. paralepidii and L. aureoviride have the mesepisternum much more densely punctate (i <1 pd). DNA barcodes Six sequences available (BOLD process IDs: LDSPS 034 - 15 to LDSPS 039 - 15). These sequences are distinct from those of other Yucatán species (maximum intraspecific p-distance 0.6 %; minimum interspecific distance (to L. aureoviride sp. nov.) 3.77 %) but poorly distinguished from other members of the L. stictaspis species complex (minimum p-distance 0.15 %).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFFCFFBAFDBED9E1FB4D0632.taxon	discussion	Remarks Common. The L. stictaspis species complex is a subset of the L. gemmatum species complex. The Yucatán morphospecies corresponds to mOTU 3 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	description	urn: lsid: zoobank. org: act: 56635 D 12 - 86 E 3 - 4758 - B 5 A 1 - BFE 003 DBAF 00 Figs 5 G – H, 6 D, 13 – 14, 25 A, 26 A, 34 C	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	diagnosis	Diagnosis Females of L. (D.) ameshoferi sp. nov. can be recognised by the combination of tegula small and ovoid with inner posterior angle not produced mesally (tegula width / ITS 0.21 – 0.22), clearly not reaching posterior margin of mesoscutum in dorsal view, and impunctate except for scattered minute punctures in anterior half; frons punctures as large and dense as those of lower paraocular area; mesoscutum with large, coarse and dense punctures (i <1 pd), crowded laterad of parapsidal lines (i = 0 pd) except on anteromedian margin (i> 1.5 pd); mesepisternum strongly rugose with the upper part areolate; metapostnotum shiny with strong subparallel rugae usually reaching posterior margin; and propodeum with strong U-shaped oblique carina sharply delineating metapostnotum. Males have the tegula small and ovoid (as in the female); frons punctures as large and dense as those of lower paraocular area, which is clearly visible beneath sparse appressed tomentum; metapostnotum with strong subparallel rugae reaching or nearly reaching posterior margin; and propodeum with trace of oblique carina present (this is unusual for males which almost always lack an oblique carina even when it is well-developed in the female). Differential diagnosis Both sexes of Lasioglossum (Dialictus) ameshoferi sp. nov. are most similar to L. (D.) nanotegula sp. nov. and females of L. (D.) milpa sp. nov. (the male is unknown). Females of L. ameshoferi are also similar to an undescribed species known from higher elevations in the mountains of Chiapas. Both sexes of L. (D.) nanotegula have the frons punctures much smaller and denser than those of the lower paraocular area, which in the male is partially obscured by dense appressed tomentum; females also have the propodeum with an oblique carina straight; and males have the propodeum without a trace of an oblique carina. Females of L. milpa also have the metapostnotum dull, imbricate, with shallow anastomosing rugae reaching posterior margin or nearly so and mesepisternum slightly sparsely punctate (i ≤ 1 – 1.5 d), while females of L. nanotegula have the mesoscutum punctures laterad of the parapsidal lines moderately dense but not crowded (i ≤ 1 pd). Females of the undescribed Chiapas species have the frons punctures much smaller and denser than those of the lower paraocular area. Lasioglossum ameshoferi sp. nov. is very similar to the Panama species L. strigosigena Michener, 1954, and diagnostic characters separating the two are not well known. It seems that the postgena of L. ameshoferi is mostly smooth, while in L. strigosigena it is entirely and strongly lineate, but a few specimens of L. ameshoferi approach the condition found in L. strigosigena. Geography is probably the most reliable way to separate these species.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	etymology	Etymology The specific epithet is dedicated to Andreas Ameshofer for his great support to PLG and his love and patience during the development of the entire study.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	materials_examined	Type material Holotype MEXICO – Campeche • ♀; Hopelchén; 19.66 ° N, 89.66 ° W; elev. 77 m; 24 Jan. 2016; Misael Hdz leg.; ECOAB. 82784. Paratypes GUATEMALA – Huehuetenango • 1 ♀; Jacaltenango, San Andrés; 15.7167 ° N, 91.7455 ° W; elev. 1027 m; 28 Feb. 2010; Miguel Cigarroa leg.; ECOAB. 44665 • 1 ♀; La Democracia, Unión; 15.574 ° N, 91.8141 ° W; elev. 1038 m; 26 Feb. 2010; Jorge Mérida leg.; ECOAB. 44666 • 1 ♀; San Antonio Huista, Pinalito; 15.6653 ° N, 91.8618 ° W; elev. 963 m; 1 May 2010; Philippe Sagot leg.; ECOAB. 44660. MEXICO – Campeche • 1 ♀; Hopelchén; 19.71 ° N, 89.8 ° W; elev. 70 m; 2 Oct. 2015; Roberto May leg.; ECOAB. 82345 • 1 ♀; Hopelchén; 19.39 ° N, 89.71 ° W; elev. 147 m; 4 Nov. 2015; Misael Hdz leg.; ECOAB. 82585 • 1 ♀; Hopelchén; 20.04 ° N, 89.74 ° W; elev. 105 m; 22 Jan. 2016; Eric Vides leg.; ECOAB. 82685. – Chiapas • 1 ♀; 37 km E of Tuxtla Gutiérrez; 16.75 ° N, 92.9167 ° W; elev. 1240 m; 12 Apr. 1993; George C. Eickwort leg.; ex Senecio deppeanus; SEMC SM 0341238 • 1 ♀; Arriaga, Ej. Adolfo López Mateos; 16.3463 ° N, 93.9741 ° W; elev. 367.5 m; 15 Sep. 2009; Carlos Balboa, Miguel Guzmán and Miguel Cigarroa leg.; ECOAB. 54267 • 1 ♀; Nicolás Ruiz and Carr. N. Ruiz-V. Guerrero; 16.4238 ° N, 92.6326 ° W; elev. 685 m; 29 Oct. 2011; Philippe Sagot leg.; ECOAB. 53509 • 2 ♀♀; Ocozocoautla; 16.84 ° N, 93.45 ° W; elev. 836 m; 30 Dec. 2015; Philippe Sagot leg.; ECOAB. 79338, 79346 • 1 ♀; Suchiapa; 16.6294 ° N, 93.0916 ° W; elev. 465 m; 8 Sep. 1987; L. Mendoza leg.; ECOAB. 43998 • 1 ♀; Venustiano Carr.; 16.49 ° N, 92.5 ° W; elev. 1073 m; 31 Dec. 2016; Philippe Sagot leg.; ECOAB. 67208. – Colima • 1 ♀; San Antonio; 19.4515 ° N, 103.7184 ° W; elev. 1200 m; 10 Oct. 2008; Laurence Packer leg.; PCYU. – Guerrero • 2 ♀♀; 23 mi W of Acapulco; [17 ° N, 100.2 ° W]; 10 Aug. 1962; Ellen Ordway leg.; SEMC. – Jalisco • 1 ♀; Chamela; [19.5 ° N, 105.04 ° W]; 6 Jul. 1985; Ricardo Ayala Barajas leg.; ex Prockia crucis; SEMC • 1 ♀; same collection data as for preceding; 17 Aug. 1985; SEMC. – Oaxaca • 1 ♀; Puerto Escondido; [15.87 ° N, 97.08 ° W]; elev. 10 m; 1 Sep. 1990; Luis M. Gódinez leg.; SEMC • 1 ♀; same collection data as for preceding; 30 Sep. 1990; SEMC. – Quintana Roo • 2 ♀♀; Tulum; [20.21 ° N, 87.47 ° W]; 22 Jan. 1976; L. Greenberg leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC. – Yucatán • 1 ♂; Yucatán, Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 293; UNAM (photographed) • 3 ♀♀; 30 mi S of Mérida; [20.53 ° N, 89.61 ° W]; 31 Jul. 1964; Paul J. Spangler leg.; USNM • 2 ♂♂; Chichén-Itzá; [20.68 ° N, 88.57 ° W]; 11 Jan. 1976; L. Greenberg leg.; SEMC • 1 ♂; Kabah, 25 km SW of Ticul; [20.25 ° N, 89.65 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC • 1 ♀; Mérida; [20.97 ° N, 89.59 ° W]; Nov. 1961; N. L. H. Krauss leg.; SEMC • 2 ♀♀; Uxmal Ruins, 16 km SW of Muna; [20.36 ° N, 89.77 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC • 1 ♀; Yaxnic; [20.79 ° N, 89.62 ° W]; 8 Apr. 1997; R. W. Brooks, H. Delphin, H. Contreras and U. Mao leg.; ex Acacia pennatula; SEMC SM 0106223. Other material examined MEXICO - Yucatán • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 113; ZMH 842030 • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 241 a 1; ZMH 842033 • 1 ♂; Tixcacaltuyub; [20 ° 25 ′ 03.1 ″ N, 88 ° 55 ′ 51.5 ″ W]; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 502 a; ZMH 839502 • 1 ♀; Tixcuytun; [20 ° 11 ′ 25.30 ″ N, 89 ° 10 ′ 29.30 ″ W]; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 493 d; ZMH 63081 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 89; ZMH 842065 • 1 ♀; Tixmehuac; [20 ° 15 ′ 52.4 ″ N, 89 ° 08 ′ 58.1 ″ W]; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 411; ZMH 842067 • 1 ♀; Yucatán, Nenela; [20 ° 14.44 ′ 0.0 ″ N, 89 ° 05 ′ 24.5 ″ W]; 9 May 2011; Quezada-Euán and Moo-Valle leg.; original label 2; UADY. Floral records ASTERACEAE Giseke: Senecio L.: S. deppeanus Hemsl. • FABACEAE Juss.: Acacia Mill.: A. pennatula (Schltdl. & Cham.) Benth. • SALICACEAE Mirb.: Prockia P. Browne ex L.: P. crucis P. Browne ex L. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes Fourteen sequences are available (BOLD process IDs: BBLEG 181 - 17, DIAL 1304 - 08, GMMCK 090 - 14, GMMCK 130 - 14, GMMCK 932 - 14, LDSPS 110 - 15 to LDSPS 118 - 15). These sequences are attributed to L. ameshoferi sp. nov. based on two specimens (BBLEG 181 - 17, DIAL 1304 - 08) that were examined and barcoded independently of the sequences from Yucatán; the specimen corresponding to BBLEG 181 - 17 is the holotype. Including the Yucatán sequences, there is a large amount of divergence (maximum intraspecific p-distance 4.21 %; minimum interspecific p-distance (to L. aureoviride sp. nov.) 5.92 %). Within the Yucatán sequence there is also variation (maximun intraspecific p-distance 1.44 %; minimum interspecific p-distance (to L. aureoviride) 5.53 %).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	description	Description Female (holotype) MEASUREMENTS. Length 5.47 mm; head length 1.48 mm; head width 1.6 mm; fore wing length 3.7 mm. 15 female paratypes measured: length 5.01 – 5.47 mm; head length 1.17 – 1.48 mm; head width 1.22 – 1.6 mm; fore wing length 3.22 – 3.7 mm. COLOUR. Head and mesosoma metallic dark blue-green; clypeus apical half black; scape black, F 1 – F 10 black dorsally, dark brown ventrally; tegula reddish brown; wing membrane subhyaline, subcosta black, venation and pterostigma otherwise brown; legs dark brown; metasoma black with apical margins of terga and sterna dark brown. PUBESCENCE. Whitish; head and mesosoma with abundant long pubescence (1 – 2.5 OD); gena with sparse appressed tomentum; propodeum with abundant plumose setae on lateral and posterior surfaces (1.5 – 2.5 OD); T 1 with dense complete setose fan; T 2 – T 3 with small basolateral patches of appressed tomentum covering less than half length of segment; T 1 – T 2 evenly and densely covered by short simple setae, T 3 – T 4 with similar setae but about twice as long; tarsal segments with plumose light-yellow setae. SURFACE SCULPTURE. Face with strong uniform large and dense punctation; clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area tessellate and sparsely punctate (i = 1 – 4 pd); upper paraocular area, frons, and ocellocular area shiny, with crowded punctures (i = 0 pd); lower paraocular area shiny and very densely punctate (i <0.5 pd); antennocular area imbricate and slightly less densely punctate (i ≤ 1 pd); gena and postgena finely lineate, becoming smooth and shiny on postgena anteriorly; mesoscutum tessellate, and large, coarsely and densely punctate (i <1 pd), becoming crowded laterad of parapsidal line (i = 0 pd) and slightly sparse on anteromedian margin (i> 1.5 pd); tegula impunctate except a few scattered minute punctures on anterior half; mesoscutellum coarsely and moderately sparsely punctate (i = 1 – 2 pd), becoming fine and dense (i <1 pd) on margins and median line; axilla shiny and densely punctate (i <1 pd); metanotum rugulose with abundant plumose setae; mesepisternum rugose with the upper part areolate; metepisternum rugose dorsally, weakly rugulose ventrally; metapostnotum shiny with coarse subparallel rugae reaching posterior margin; propodeum posterior surface smooth and tessellate; T 1 anterior surface coriarious; T 1 – T 2 shiny to weakly coriarious, and finely and sparsely punctate (i = 2 – 4 pd). STRUCTURE. Head wide (length / width ratio = 0.91 – 0.98; holotype = 0.93); eyes weakly convergent below (UOD / LOD ratio = 1.19 – 1.46; holotype = 1.46); clypeus ¾ below suborbital tangent; antennal sockets close (IAD / AOD <1.18); frontal line ending 2.5 OD below median ocellus; gena wider than eye; tegula ovoid and relatively small, not produced mesally; inner metatibial spur pectinate, with three teeth; scutellum length 0.36; metapostnotum length 0.35, metapostnotum moderately long (MMR ratio = 1.03), posterior margin sharply angled onto posterior surface; propodeum with strong U-shaped oblique carina extending onto dorsolateral slope. Male MEASUREMENTS. Length 5.37 – 3.85 mm; head length 1.25 – 1.48 mm; head width 1.43 – 1.58 mm; fore wing length 2.59 – 3.5 mm. COLOUR. Head and mesosoma metallic dark turquoise-green to golden-green; clypeus apical half black; scape black, F 1 – F 10 black dorsally, dark brown ventrally; tegula dark reddish brown; legs black with tarsi becoming dark reddish brown; metasoma black with apical rims of terga and sterna dark reddish brown. PUBESCENCE. Dull white; head and mesosoma with abundant long setae (1 – 2.5 OD); S 3 – S 5 pubescence short (1 – 2 OD), suberect, and weakly plumose, appearing simple at <40 × magnification; face with sparse appressed tomentum below eye emargination; propodeum with abundant long plumose setae on lateral and posterior surfaces (1.5 – 2.5 OD); discs of metasomal terga with sparse, short, simple setae medially and longer plumose setae laterally (1 – 3 OD). SURFACE SCULPTURE. Clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area tessellate and sparsely punctate (i = 1 – 3 pd); paraocular area, frons, and ocellocular area shiny with crowded punctures (i = 0 pd); gena and postgena finely lineate to imbricate; mesoscutum shiny and coarsely, moderately sparsely punctate (i = 1 – 2 pd); tegula impunctate; mesoscutellum coarsely and sparsely punctate (i = 2 – 4 pd), becoming dense on margins and median line (i <1 pd); metanotum areolate-rugulose; mesepisternum rugose and obscurely punctate; metapostnotum shiny with coarse and strong subparallel rugae reaching posterior margin; propodeum posterior surface shiny and finely, sparsely punctate (i = 1 – 3 pd), dorsolateral slope sometimes roughened by rugae reaching posterior margin, and with trace of oblique carina present (this is unusual for males which almost always lack an oblique carina even when it is well-developed in the female); discs of T 1 – T 3 shiny and sparsely punctate in basal half (i = 1 – 3 pd), becoming very sparse in apical half (i = 2 – 4 pd); apical impressed areas impunctate. STRUCTURE. Head wide (length / width ratio = 0.80 – 0.81); eyes weakly convergent below (UOD / LOD ratio = 1.13 – 1.29); clypeus ¾ below suborbital tangent; antennal sockets close (IAD / AOD <0.48); frontal line ending 2.5 OD below median ocellus; gena wider than eye; tegula small and ovoid, not produced mesally and clearly not reaching posterior margin of mesoscutum in dorsal view; scutellum length 0.32; metapostnotum length 0.29, metapostnotum long (MMR ratio = 1.1), posterior margin gently angled onto posterior surface; genitalia with penis valve small and delicate, retrorse lobe small, gonostylus wider and rounded with a few short, simple setae near apex.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	distribution	Distribution Yucatán Peninsula and Pacific coast from Oaxaca to Jalisco.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF2FFBCFE13DE64FD7A027F.taxon	discussion	Remarks Uncommon. Lasioglossum ameshoferi sp. nov. has an unusual distribution which seems to cross from the Atlantic coast to the Pacific coast at the Isthmus of Tehuantepec. It is not known from the Atlantic coast west of the isthmus or the Pacific coast east of the isthmus. Specimens from both sides are nearly identical both morphologically and in their DNA barcodes, precluding any consideration of splitting the populations into separate species. It is possible that additional sampling will reveal a more extensive distribution. This species is a member of the informal L. comulum species group and corresponds to mOTU 7 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	description	urn: lsid: zoobank. org: act: C 0 BCD 1 CE- 12 B 0 - 4363 - AD 44 - D 4 B 628683 ACC Figs 5 E – F, 6 E, 15 – 16, 28 B, 32 A, 35 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	diagnosis	Diagnosis Females of L. (Dialictus) aureoviride sp. nov. can be recognised by the diagnostic combination of tegula enlarged (reaching posterior margin of mesoscutum in dorsal view or nearly so and tegula width / ITS 0.21 – 0.24), with inner posterior margin straight, and scattered minute punctures (i ≥ 1.5 pd), becoming moderately dense on posterior margin (i = 1 – 2 pd) but still inconspicuous, smaller than those of mesoscutum; mesepisternum very densely punctate (i <0.5 pd); mesoscutum weakly tessellate and sparsely punctate between parapsidal lines (i = 1 – 3 pd) and with dense plumose setae about 1 OD long (all setae less than half their length from each other in lateral view); supraclypeal area sparsely punctate (i = 1 – 3 pd); metapostnotum dull with shallow rugae blending into finely reticulate background microsculpture; T 2 – T 3 apical impressed areas evenly covered with minute punctures and fine setae. Males may be recognised by the same characters, except the tegula is often more distinctly, but still sparsely punctate (i = 1 – 3 pd) and the T 2 – T 3 apical impressed areas are impunctate. Differential diagnosis Both sexes of Lasioglossum (Dialictus) aureoviride sp. nov. are most similar to Lasioglossum (Dialictus) paxtoni sp. nov., Lasioglossum (Dialictus) yucatanense sp. nov., to species within the L. stictaspis species complex and L. paralepidii sp. nov., all found on the Yucatán Peninsular, the subtropical Florida species L. lepidii (Graenicher, 1927), and some possible undescribed species occurring in other parts of Mexico. Both sexes of all of these undescribed Mexican species have the tegula more distinctly and densely punctate (i = 1 – 3 pd in females, i ≤ 1 pd in males) and the metapostnotum shiny with strong, coarse rugae. Both sexes of L. paralepidii and L. lepidii also have the mesoscutum densely punctate (i ≤ 0.5 – 1 pd), becoming moderately sparse submedially and anteromedially (i = 1 – 2 pd), and both sexes of L. paralepidii have the supraclypeal area shiny and very densely punctate (i ≤ 0.5 – 1 pd). For differences between L. (D.) aureoviride and L. (D.) paxtoni see above in the diagnosis for the latter. For differences between L. (D.) aureoviride and L. (D.) yucatanense see above in the diagnosis for the latter. For differences between L. (D.) aureoviride and the species of the L. stictaspis species complex see above in the diagnosis for that complex.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	etymology	Etymology The specific epithet ‘ aureoviride ’ is a combination of the Latin adjectives ‘ aureum ’ (‘ golden’) and ‘ viride ’ (‘ green’), referring to the presence of both colours on the thorax.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	materials_examined	Type material Holotype MEXICO - Yucatán • ♀; Tixcuytún; [20.2061 ° N, 89.1549 ° W]; 7 Jun. 2011; Quezada-Euán and MooValle leg.; original label 490 d; UNAM. Paratypes MEXICO – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM 0753056 • 1 ♀; 49 km NE of Felipe Carrillo Puerto; [19.89 ° N, 87.71 ° W]; 11 Oct. 1986; Charles D. Michener leg.; SEMC • 6 ♂♂; Xcan; [20.87 ° N, 87.6 ° W]; 31 Jul. 1962; A. B. Amerson Jr. leg.; SEMC. – Yucatán • 1 ♂; 6 km E of Uxmal; [20.36 ° N, 89.71 ° W]; 6 Apr. 1997; R. W. Brooks leg.; ex Vitex gaumeri; SEMC SM 0106177 (photographed) • 1 ♀; Alfonso Caso; 20.084 ° N, 89.1609 ° W; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 842058 • 1 ♂; Xmatkuil, 15 km S of Mérida; [20.86 ° N, 89.62 ° W]; 13 Feb. 1987; Charles D. Michener leg.; SEMC • 2 ♀♀; ChichénItzá Ruins (near Piste); [20.68 ° N, 88.57 ° W]; 15 Feb. 1987; Charles D. Michener leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC • 1 ♀; Dzibichaltún; [21.1 ° N, 89.6 ° W]; 13 Jan. 1976; L. Greenberg leg.; SEMC • 4 ♀♀; Kabah, 25 km SW of Ticul; [20.25 ° N, 89.65 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC • 3 ♂♂; same collection data as for preceding; 14 Feb. 1987; Charles D. Michener leg.; SEMC • 1 ♀; Mérida; [20.97 ° N, 89.59 ° W]; Nov. 1961; N. L. H. Krauss leg.; SEMC • 1 ♀; Mérida; 20.9678 ° N, 89.5928 ° W; 19 Oct. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 839501 • 5 ♀♀; Mérida, 15 km S of University of Yucatán; [20.83 ° N, 89.62 ° W]; 7 Apr. 1997; R. W. Brooks leg.; ex Piscidia piscipula; SEMC SM 0105911, SM 0105919, SM 0105921, SM 0105923, SM 0105927 • 3 ♂♂; same collection data as for preceding; SEMC SM 0105912, SM 0105913, SM 0105920 • 2 ♀♀; Yaxnic; [20.79 ° N, 89.62 ° W]; 8 Apr. 1997; R. W. Brooks, H. Delphin, H. Contreras and U. Mao leg.; ex Acacia pennatula; SEMC SM 0105951, SM 0106219 • 4 ♂♂; same collection data as for preceding; SEMC SM 0106222, SM 0106227, SM 0106247, SM 0106248 • 1 ♂; same collection data as for preceding; ex Porophyllum punctatum; SEMC SM 0106360. Other material examined MEXICO - Yucatán • 1 ♀; Mérida; [20 ° 58 ′ 04.05 ″ N, 89 ° 35 ′ 33.93 ″ W]: 19 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 622 d 1; ZMH 839506 • 1 ♀; Moctezuma; [21 ° 24 ′ 46.2 ″ N, 87 ° 42 ′ 05.7 ″ W]; 30 May 2011; Quezada-Euán and Moo-Valle leg.; original label 149; ZMH 842038 • 1 ♀; same collection data as for preceding; original label 157; ZMH 842039 • 1 ♀; San Pedro Bacab; [21 ° 18 ′ 04.9 ″ N, 87 ° 38 ′ 24.8 ″ W]; 31 May 2011; Quezada-Euán and Moo-Valle leg.; original label 175; ZMH 842041 • 1 ♀; San Pedro Bacab; [21 ° 18 ′ 04.9 ″ N, 87 ° 38 ′ 24.8 ″ W]; 31 May 2011; Quezada-Euán and Moo-Valle leg.; original label 176; ZMH 842042 • 1 ♀; same collection data as for preceding; original label 181; ZMH 842043 • 1 ♀; same collection data as for preceding; original label 188; ZMH 842044 • 1 ♀; Rancho Alegre; [21 ° 18 ′ 26.7 ″ N, 87 ° 46 ′ 29.6 ″ W]; 13 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 219; ZMH 842045 • 1 ♀; Nenela; [20 ° 20 ′ 10.90 ″ N, 89 ° 1 ′ 19.20 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 342 b; ZMH 842047 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 489 e; ZMH 842048 • 1 ♀; same collection data as for preceding; original label 490; ZMH 842049 • 1 ♀; same collection data as for preceding; original label 491 c; ZMH 842050 • 1 ♀; Muna; [20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W]; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 546; ZMH 842051 • 1 ♀; same collection data as for preceding; original label 564; ZMH 842053 • 1 ♀; same collection data as for preceding; original label 570 d; ZMH 842054 • 1 ♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 1 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 603 c; ZMH 842055 • 1 ♀; Mérida; [20 ° 58 ′ 04.05 ″ N, 89 ° 35 ′ 33.93 ″ W]; 19 Oct. 2011; QuezadaEuán and Moo-Valle leg.; original label 622 a; ZMH 842057 • 1 ♀; San Pedro Bacab; [21 ° 18 ′ 04.9 ″ N, 87 ° 38 ′ 24.8 ″ W]; 31 May 2011; Quezada-Euán and Moo-Valle leg.; original label 172; ZMH 842040 • 1 ♀; Xaya, [20 ° 16 ′ 51.70 ″ N, 89 ° 11 ′ 28.70 ″ W]; 5 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 621; ZMH 842056 • 1 ♀; Nenela; [20 ° 20 ′ 10.90 ″ N, 89 ° 1 ′ 19.20 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 342 e; ZMH 842046 • 1 ♀; Muna; [20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W]; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 553; ZMH 842052 • 1 ♀; Yucatán, Tekal de Venegas; [21 º 01 ′ 40.5 ″ N, 88 ° 58 ′ 46.3 ″ W]; 21 May 2011; Quezada-Euán and Moo-Valle leg.; original label 115; UADY. Floral records ASTERACEAE Giseke: Porophyllum Guett.: P. punctatum (Mill.) S. F. Blake • FABACEAE Juss.: Acacia Mill.: A. pennatula (Schltdl. & Cham.) Benth. • Piscidia L.: P. piscipula (L.) Sarg. • LAMIACEAE Martinov: Vitex L.: V. gaumeri Greenm. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes Twenty-five sequences available (BOLD process IDs: LDSPS 052 - 15 to LDSPS 076 - 15). The holotype and male paratype are GenBank accession: KU 574945. BOLD process ID: LDSPS 065 - 15, paratype male GenBank accession: KU 574946. BOLD process ID: LDSPS 064 - 15. These sequences are very variable (maximum intraspecific p-distance 1.63 %; minimum interspecific p-distance (to L. lepidii) 2.15 %). This group of sequences is tentatively attributed to L. aureoviride sp. nov., although they share similarity with L. lepidii sequences. Some sequences are likely attributable to L paralepidii sp. nov. as well, but the intraspecific variation is too great to distinguish species within the broader L. lepidii species complex.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	description	Description Female (holotype) MEASUREMENTS. Length 4.3 mm; head length 1.26 mm; head width 1.33 mm; fore wing length 2.77 mm. Ten female paratypes measured: length 4.1 – 4.3 mm; head length 1.17 – 1.26 mm; head width 1.22 – 1.33 mm; fore wing length 2.77 – 2.78 mm. COLOUR. Head and mesosoma metallic dark turquoise-green with golden reflections on mesoscutum; clypeus apical half black; scape dark reddish brown, F 1 – F 10 dark reddish brown dorsally, light brown ventrally; tegula reddish-brown; wing membrane subhyaline, venation and pterostigma brown; legs dark brown; metasoma black with rims of terga and sterna dark brown. PUBESCENCE. Dull white; head and mesosoma with abundant long setae (1 – 2.5 OD); lower paraocular area and gena with sparse subappressed tomentum; mesoscutum with dense erect setae ~ 1 OD long interspersed with subappressed setae 0.25 – 0.5 OD long; propodeum with abundant plumose setae on lateral and posterior surfaces (1.5 – 2.5 OD); T 1 with dense and complete setose fan, T 2 – T 3 basal margins with dense appressed tomentum and disc of T 4 with sparse tomentum throughout; T 2 – T 4 evenly covered with dense, short, simple setae becoming long and plumose laterally (1 – 3 OD); tarsal segments with plumose, light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and moderately sparsely punctate (i = 1 – 2 pd); supraclypeal area shiny and sparsely punctate (i = 1 – 3 pd); lower paraocular area shiny and densely punctate (i <1 pd); antennocular area imbricate and densely punctate (i ≤ 1 pd); upper paraocular area and frons shiny and finely, densely punctate (i <1 pd); ocellocular area shiny and densely punctate (i ≤ 1 pd); gena and postgena lineolate; tegula with a few fine and scattered minute punctures (i ≥ 1.5 pd), hardly visible at 40 × magnification; mesoscutum weakly tessellate and sparsely punctate (i = 1 – 3 pd), becoming dense laterad of parapsidal lines (i <1 pd); mesoscutellum shiny and moderately densely punctate (i = 1 – 1.5 pd); axilla shiny and densely punctate (i <1 pd); metanotum finely rugulose; mesepisternum very densely punctate (i <0.5 pd); metapostnotum dull with shallow subparallel rugae blending into finely reticulate background microsculpture; propodeum with posterior surface tessellate; T 1 – T 2 weakly coriarious and minutely, moderatey sparsely punctate (i = 1 – 2 pd); T 2 – T 3 apical impressed areas weakly coriarious and minutely, sparsely punctate (i = 1 – 4 pd). STRUCTURE. Head wide (length / width ratio = 0.95 – 0.99; holotype = 0.95); eyes weakly convergent below (UOD / LOD ratio = 1.16 – 1.24; holotype = 1.21); clypeus ⁴ / 5 below suborbital tangent; antennal sockets close (IAD / AOD <0.54); frontal line ending 2.5 – 3 OD below median ocellus; gena narrower than eye; tegula inner posterior margin straight; inner metatibial spur pectinate with three teeth; scutellum length 0.27; metapostnotum length 0.22, metapostnotum elongate (MMR ratio = 1.23), posterior margin sharply angled onto posterior surface, propodeum with oblique carina present and lateral carina not reaching margin of dorsal surface. Male MEASUREMENTS. Length: 4.5 – 4.52 mm; head length 1.01 – 1.3 mm; head width 1.07 – 1.33 mm; fore wing length 3.13 – 3.33 mm. COLOUR. Head and mesosoma dark turquoise-green to olive green; clypeus apical half black; scape black; F 1 – F 11 dark brown dorsally, light brown ventrally; tegula reddish-brown; legs dark brown with tarsi light brown; wing membrane subhyaline; venation and pterostigman brown; metasoma black with rims of terga and sterna dark brown. PUBESCENCE. Dull white. Head and mesosoma with abundant long setae (1 – 2 OD); paraocular area and lower frons with dense appressed tomentum; clypeus, supraclypeal area, gena, and preëpisternum with sparse appressed tomentum; mesoscutum with dense plumose setae 0.5 – 1 OD long (all setae separated by less than half their length in lateral view); propodeum with abundant plumose setae on lateral and posterior surfaces (1 – 2 OD); tarsal segments with plumose light-yellow setae; discs of T 1 – T 6 evenly covered with dense, short, simple setae, becoming long and plumose laterally (1 – 3 OD). SURFACE SCULPTURE. Clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area shiny and moderately sparsely punctate (i = 1 – 2 pd); paraocular area and ocellocular area shiny and densely punctate (i <1 pd); frons shiny with fine, crowded punctures (i = 0 pd); gena and postgena shiny; tegula finely, sparsely punctate (i = 1 – 3 pd); tegula with sparse punctures medially (i> 1.5 dp) (sometimes inconspicuous and tegula nearly impunctate); mesoscutum shiny and sparsely punctate (i = 1 – 3 pd), becoming dense laterad of parapsidal lines and on posterior margin (i ≤ 1 pd); mesoscutellum shiny and densely punctate (i ≤ 1 pd); mesepisternum rugulose with distinct dense punctures (i <1 pd); propodeum with posterior surface shiny and densely punctate (i <1 pd); discs of T 1 – T 3 shiny and moderately densely punctate (i = 1 – 2 pd), apical impressed areas impunctate. STRUCTURE. Head wide (length / width ratio = 0.94 – 0.96); eyes weakly convergent below (UOD / LOD ratio = 1.16 – 1.24; holotype = 1.19); clypeus ⁴ / 5 below suborbital tangent; antennal sockets separated (IAD / AOD> 1.19); frontal line ending 2.5 – 3 OD below median ocellus; tegula enlarged, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight; scutellum length 0.28; metapostnotum length 0.22, metapostnotum elongate (MMR ratio = 1.27), posterior margin rounded onto posterior surface; genitalia with penis valve long and wide, retrorse lobe enlarged and wide, gonostylus medium and rounded, with a few short, simple setae near apex; S 7 – S 8 median processes narrow.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	distribution	Distribution Only known from the Yucatán Peninsula.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFF4FF87FEA4DA3BFC2E06EA.taxon	discussion	Remarks Common. Morphologically similar specimens were examined from the Atlantic coast from Veracruz to Tamaulipas. These specimens have the metapostnotum with strong anastomosing rugae, tegula more distinctly punctate, and the face noticeably shorter, and are thought to be an undescribed species. Lasioglossum aureoviride sp. nov. is a member of the L. gemmatum species complex and partially corresponds to mOTU 5 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	description	urn: lsid: zoobank. org: act: D 68 E 4 E 0 E- 879 C- 4944 - 9 AFE- 025 ADC 3580 AE Figs 6 F, 17 – 18. 29 B, 31 B, 32 B, 35 B, 36 B	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	diagnosis	Diagnosis Females of L. paralepidii sp. nov. can be recognised by the diagnostic combination of tegula enlarged (reaching posterior margin of mesoscutum in dorsal view), sparsely punctate (i = 1 – 3 pd), becoming dense on lateral and posterior margins (i ≤ 1 pd), and with inner posterior margin weakly concave; mesoscutum densely punctate (i ≤ 0.5 – 1 pd), becoming moderately sparse submedially and anteromedially (i = 1 – 2 pd); supraclypeal area very densely punctate (i ≤ 0.5 – 1 pd); mesepisternum very densely punctate (i <0.5 pd); metapostnotum mostly shiny with weak microsculpture and strong anastomosing rugae reaching posterior margin; and T 2 – T 3 apical impressed areas evenly covered with dense, short, simple setae. Males can be recognised by the same characters, except the tegula is more densely punctate (i ≤ 1 pd), the metapostnotum shiny with strong anastomosing rugae, and the metasomal terga apical impressed areas are glabrous. In addition, the paraocular area is covered with dense appressed tomentum contrasting with the clypeus and supraclypeal area, which are mostly bare. Differential diagnosis Both sexes of L. paralepidii sp. nov. are most similar to L. aureoviride sp. nov. and some members of the L. stictaspis species complex. They are also very similar to the subtropical Florida species L. lepidii. See the differential diagnoses for L. aureoviride and the L. stictaspis species complex for comparison. Males of L. lepidii have the face below the eye emargination, including the clypeus and supraclypeal area, completely covered with dense appressed tomentum. Females of L. lepidii are morphologically nearly identical to L. paralepidii sp. nov., and reliable diagnostic characters separating the two are not known; it is best to identify females by geography and / or in association with males.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	etymology	Etymology The specific epithet ‘ paralepidii ’ sp. nov. is formed from the Greek prefix ‘ para - ’ (‘ near’) and the specific epithet ‘ lepidii ’, referring to its close relationship to L. lepidii.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	materials_examined	Type material Holotype MEXICO – Quintana Roo • ♂; Felipe Carrillo Puerto; 19.35 ° N, 88.03 ° W; 10 – 14 Oct. 1986; USDAARS staff leg.; BBSL 1100921. Paratypes MEXICO – Quintana Roo • ♀; Isla Mujeres; 21.2412 ° N, 86.7397 ° W; 25 Jan. 1981; George E. Bohart leg.; BBSL 1100936 • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM 0753055 • 1 ♀; 8 km W of Puerto Morelos; [20.85 ° N, 86.95 ° W]; 16 Oct. 1986; Charles D. Michener leg.; SEMC • 2 ♂♂; Felipe Carrillo Puerto; 19.35 ° N, 88.03 ° W; 10 – 14 Oct. 1986; F. D. Parker leg.; BBSL 1100928, 1100930 • 4 ♂♂; same collection data as for holotype; BBSL 1100922 to 1100925 • 1 ♂; same collection data as for preceding; 13 Oct. 1986; F. D. Parker and Terry L. Griswold leg.; ex Mentha sp.; BBSL 1100934 • 1 ♂; Vallarta, 17 km W of Puerto Morelos; 20.8619 ° N, 87.0304 ° W; 6 – 8 Oct. 1986; Terry L. Griswold leg.; BBSL 1100937. – Yucatán • 1 ♀; Progreso Beach, N of Mérida; [21.28 ° N, 89.66 ° W]; 29 Jun. 1966; University of Kansas Mexico Expedition leg.; SEMC • 1 ♂; same collection data as for preceding; SEMC • 1 ♀; Tixcuytún; 20.2061 ° N, 89.1549 ° W; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 842060. Other material examined MEXICO – Tabasco • 1 ♀; 38 mi SE of Villahermosa; 17.6872 ° N, 92.5216 ° W; 9 Sep. 1974; George E. Bohart and W. J. Hanson leg.; BBSL 1101072 • 1 ♂; same collection data as for preceding; BBSL 1101071. Floral records LAMIACEAE Martinov: Mentha L. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes None confirmed, but it is reasonably likely that some of the sequences listed for L. aureoviride sp. nov. actually correspond to L. paralepidii sp. nov. (see the discussion of DNA barcodes for L. aureoviride).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	description	Description Female MEASUREMENTS. Length 4.02 mm; head length 1.18 mm; head width 1.27 mm; fore wing length 2.57 mm. COLOUR. Head and mesosoma metallic blue-green with golden reflections on mesoscutum, clypeus, and supraclypeal area; clypeus apical half black; scape and pedicel dark reddish brown, F 1 – F 10 dark reddish brown, F 8 – F 10 becoming light brown ventrally; tegula dark reddish-brown; wing membrane subhyaline, venation and pterostigma brown; legs dark brown; metasoma black with rims of terga and sterna reddish brown. PUBESCENCE. Dull white; head and mesosoma with abundant long setae (1 – 2.5 OD); lower paraocular area, gena, and preëpisternum with sparse subappressed tomentum; mesoscutum with dense erect setae ~ 1 OD long interspersed with subappressed setae 0.25 – 0.5 OD long; propodeum with abundant plumose setae on lateral and posterior surfaces (1.5 – 2.5 OD); T 1 with dense and complete setose fan, T 2 – T 3 basal margins with dense appressed tomentum and disc of T 4 with sparse tomentum throughout; T 2 – T 4 evenly covered with dense, short, simple setae becoming long and plumose laterally (1 – 3 OD); tarsal segments with plumose, light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area shiny and very densely punctate (i ≤ 0.5 - 1 pd); lower paraocular area shiny and densely punctate (I ≤ 1 pd); antennocular area imbricate and densely punctate (i ≤ 1 pd); upper paraocular area and frons shiny and finely, densely punctate (i <1 pd); ocellocular area shiny and densely punctate (i ≤ 1 pd); gena and postgena lineate; tegula finely and sparsely punctate (i = 1 – 3 pd), becoming dense on lateral and posterior margins (i ≤ 1 pd); mesoscutum weakly tessellate and densely punctate (i ≤ 0.5 - 1 pd), becoming moderately sparse submedially and anteromedially (i = 1 – 2 pd); mesoscutellum weakly tessellate and densely punctate (i <1 pd), becoming moderately sparse submedially (i = 1 – 2 pd); axilla shiny and densely punctate (i <1 pd); metanotum finely rugulose; mesepisternum imbricate and very densely punctate (i <0.5 pd); metapostnotum shiny laterally, becoming dull with finely reticulate microsculpture medially, covered with strong anastomosing rugae reaching posterior margin; propodeum with posterior surface weakly tessellate; T 1 – T 2 weakly coriarious and minutely, moderatey sparsely punctate (i = 1 – 2 pd); T 2 – T 3 apical impressed areas weakly coriarious and minutely, sparsely punctate (i = 1 – 4 pd). STRUCTURE. Head wide (length / width ratio = 0.93); eyes weakly convergent below (UOD / LOD ratio = 1.20); clypeus ³ / 5 below suborbital tangent; antennal sockets close (IAD / AOD = 0.52); frontal line ending 1 – 2 OD below median ocellus; gena narrower than eye; tegula inner posterior margin straight; inner metatibial spur pectinate, with three teeth; metapostnotum elongate (MMR ratio = 1.09), posterior margin sharply angled onto posterior surface, propodeum with oblique carina straight and lateral carina not reaching margin of dorsal surface. Male (holotype) MEASUREMENTS. Length: 4.16 mm; head length 1.05 mm; head width 1.05 mm; fore wing length 2.53 mm. COLOUR. Head and mesosoma metallic blue-green to golden green; clypeus apical half black; scape and pedicel brown; F 1 – F 11 dark brown dorsally, light brown ventrally; tegula dark reddish brown; legs dark brown with tarsi light brown; wing membrane hyaline; venation and pterostigma brown; metasoma dark brown with rims of terga and sterna reddish brown. PUBESCENCE. Dull white. Head and mesosoma with abundant long setae (1 – 2 OD); paraocular area and lower frons with dense appressed tomentum; gena, preepisternum, and sometimes clypeus and supraclypeal area with sparse appressed tomentum; mesoscutum with dense plumose setae 0.5 – 1 OD long; propodeum with abundant plumose setae on lateral and posterior surfaces (1 – 2 OD); tarsal segments with plumose light-yellow setae; discs of T 1 – T 6 evenly covered with dense, short, simple setae, becoming long and plumose laterally (1 – 3 OD). SURFACE SCULPTURE. Clypeus shiny and densely punctate (i <1 pd); supraclypeal area shiny and densely punctate (i ≤ 1 pd); paraocular area and ocellocular area shiny and densely punctate (i <1 pd); frons shiny with fine, crowded punctures (i = 0 pd); gena shiny; postgena lineolate; tegula densely punctate medially (i ≤ 1 pd); mesoscutum shiny or tessellate and moderately densely punctate (i = 1 – 2 pd), becoming denser laterad of parapsidal lines and on posterior margin (i <1 pd); mesoscutellum shiny and densely to moderately densely punctate (i = 0.5 – 2 pd); mesepisternum shiny and densely punctate (i <1 pd); metapostnotum shiny with weak microsculpture and strong rugae; propodeum with posterior surface shiny and moderately sparsely punctate (i = 1 – 2 pd); discs of T 1 – T 3 shiny and finely, moderately densely punctate (i = 1 – 2 pd), apical impressed areas impunctate. STRUCTURE. Head round (length / width ratio = 1.00); antennal sockets separated (IAD / AOD = 1.35); frontal line ending 1 – 2 OD below median ocellus; tegula enlarged, reaching posterior margin of mesoscutum in dorsal view, with inner posterior margin straight or weakly concave; metapostnotum elongate (MMR ratio = 1.34), posterior margin rounded onto posterior surface; genitalia not examined.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	distribution	Distribution Only known from the Yucatán Peninsula.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFCFFF8AFE4FDEAFFDE501C0.taxon	discussion	Remarks Uncommon. Some morphologically similar specimens were examined from María Cleofas, Isla Tres Marías, Nayarit. These specimens have the metapostnotum rugae not reaching the posterior margin and are believed to be an undescribed species. It seems likely that there is a large complex including many undescribed species related to L. lepidii, L. aureoviride sp. nov., and L. paralepidii sp. nov. occurring throughout the Neotropics. Further revisionary work is needed to elucidate this complex. Lasioglossum paralepidii is a member of the L. gemmatum species complex and partially corresponds to mOTU 5 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	description	urn: lsid: zoobank. org: act: 6 D 61 F 2 D 7 - BF 99 - 4 B 3 E- 8560 - 01405 B 0 F 3977 Figs 6 G, 19, 25 C, 27 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	diagnosis	Diagnosis Females of L. (D.) milpa sp. nov. can be recognised by the diagnostic combination of tegula small, ovoid, not produced mesally (tegula width / ITS <0.20), and impunctate; frons punctures much smaller and denser than those of lower paraocular area; mesoscutum sparsely punctate between parapsidal lines (i = 1.5 – 3 pd), becoming moderately dense but not crowded laterad of parapsidal lines (i = 1 pd); metapostnotum dull, imbricate with shallow anastomosing rugae reaching posterior margin or nearly so; and head about as long as broad (length / width 0.95 – 0.99). The male is unknown. Differential diagnosis Females of Lasioglossum (D.) milpa sp. nov. are most similar to those of L. (D.) ameshoferi sp. nov., L. (D.) nanotegula sp. nov., and L. (D.) aureoviride sp. nov. Females of L. ameshoferi also have the frons punctures as large and dense as those in the lower paraocular area and the mesoscutum much more coarsely and densely punctate laterad of the parapsidal lines (i = 0 pd). Females of L. ameshoferi and L. nanotegula have the metapostnotum shiny with strong and coarse rugae and the propodeum with its oblique carina U-shaped and extending onto the dorsolateral slope. Females of L. aureoviride have the tegula enlarged (reaching posterior margin in dorsal view), with the inner posterior margin straight.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	etymology	Etymology The specific epithet ‘ milpa ’ is a noun in apposition that refers to the traditional agriculture that is mainly found in the region and apparently beneficial for the different species of Lasioglossum (Dialictus) found there (Landaverde-González et al. 2017 b).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	materials_examined	Type material Holotype MEXICO – Campeche • ♀; Hopelchén; 19.41 ° N, 89.35 ° W; elev. 130 m; 27 Jan. 2016; Eric Vides leg.; ECOAB. 82909. Paratypes MEXICO – Chiapas • 1 ♀; Ocosingo, El Rosario; 16.8859 ° N, 92.2742 ° W; elev. 1118 m; 11 Feb. 2010; Jorge Mérida leg.; ECOAB. 43291. – Yucatán • 1 ♀; Tixcacaltuyub; [20.4175 ° N, 88.931 ° W]; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 839502 • 1 ♀; Uxmal Ruins, 16 km SW of Muna; [20.36 ° N, 89.77 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC. Other material examined MEXICO – Yucatán • 1 ♀; Tixcacaltuyub; [20.4175 ° N, 88.931 ° W]; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; ZMH 839505 • 2 ♀♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original labels 602 a, 602 b; ZMH 81035, 81036 • 2 ♀♀; same collection data as preceding; original labels 604 a 1, 604 a 2; ZMH 81037, 81038 • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 6 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 240 a 2; ZMH 839504 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 84; ZMH 842058 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 85; ZMH 842059 • 1 ♀; Moctezuma; [21 ° 24 ′ 46.2 ″ N, 87 ° 42 ′ 05.7 ″ W]; 30 May 2011; Quezada-Euán and Moo-Valle leg.; original label 159; ZMH 842028 • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 238; ZMH 842032 • 1 ♀; Tixcacaltuyub; 20 ° 25 ′ 03.1 ″ N, 88 ° 55 ′ 51.5 ″ W; 22 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 503 d; ZMH 842061 • 1 ♀; Santa María; [20 ° 23 ′ 32.5 ″ N, 88 ° 55 ′ 14.6 ″ W]; 26 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 587 b; ZMH 842063 • 1 ♀; Santa María; 20 ° 23 ′ 32.5 ″ N, 88 ° 55 ′ 14.6 ″ W; 26 Jul. 2011; Quezada-Euán and MooValle leg.; original label 588; ZMH 842064 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 493; ZMH 842060 • 1 ♀; Muna; 20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 570 c; ZMH 842062 • 1 ♀; Nenela; [20 ° 20 ′ 10.90 ″ N, 89 ° 1 ′ 19.20 ″ W]; 10 May 2011; Quezada-Euán and Moo-Valle leg.; original label 40; UADY • 1 ♀; Timul; 20 ° 18 ′ 56.1 ″ N, 88 ° 55 ′ 55.9 ″ W; 9 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 301; UADY. Floral records SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes Twenty-eight sequences available (BOLD process IDs: LDSPS 077 - 15 to LDSPS 095 - 15, LDSPS 098 - 15, LDSPS 099 - 15, LDSPS 103 - 15 to LDSPS 109 - 15). These sequences are extremely variable, and therefore poorly distinguished from those of other species (maximum intraspecific p-distance 2.45 %; minimum interspecific p-distance (to L. aureoviride sp. nov.) 4.32 %). This group of sequences is very tentatively attributed to L. milpa sp. nov. based on their similarity to the L. sp. mex 8 sequence (unfortunately the original specimen to be designated as holotype was destroyed), an undescribed species which is most morphologically similar to L. milpa. However, it is possible that more cryptic species exists.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	description	Description Female (holotype) MEASUREMENTS. Length 4.13 mm; head length 1.24 mm; head width 1.3 mm; fore wing length 2.93 mm. Eight female paratypes measured: length 4.13 – 5.10 mm; head length 1.17 – 1.24 mm; head width 1.22 – 1.3 mm; fore wing length 2.78 – 2.93 mm. COLOUR. Head and mesosoma blue-green to olive green; clypeus apical half black; scape and pedicel black; F 1 – F 10 black dorsally, brown ventrally; tegula reddish brown; wing membrane subhyaline, venation and pterostigma brown; legs dark brown; metasoma black with rims of terga and sterna dark brown. PUBESCENCE. Dull white; head and mesosoma with abundant long setae (1 – 2.5 OD); lower paraocular area and gena with sparse subappressed tomentum; propodeum with abundant plumose setae on lateral and posterior surfaces (1.5 – 2.5 OD); mesepisternum with dense plumose setae (1 – 1.5 OD); T 1 with dense complete setose fan; T 1 shiny with sparse, short, simple setae medially; T 2 – T 4 evenly covered with dense, short, simple setae, about half as long on T 2 and absent on apical impressed area medially; T 2 – T 3 with small basolateral patches of appressed tomentum covering less than half length of segment laterally; T 4 with sparse tomentum in basal half, tibia and tarsal segments with plumose light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area shiny and moderately sparsely punctate (i = 1 – 2 pd); lower paraocular area shiny and densely punctate (i <1 pd); antennocular area imbricate and densely punctate (i ≤ 1 pd); upper paraocular area and frons shiny with crowded punctures (i = 0 pd); ocellocular area shiny and moderately densely punctate (i = 1 – 2 pd); punctures of upper half of face distinctly smaller and denser than punctures of lower half; gena and postgena lineate; mesoscutum between parapsidal lines sparsely punctate (i = 1.5 – 3 pd), becoming moderately dense laterad of parapsidal lines (i = 1 pd); metapostnotum dull, imbricate with shallow anastomosing rugae reaching posterior margin or nearly so; mesepisternum slightly sparsely punctate (i ≤ 1 – 1.5 d); metepisternum finely rugulose; propodeum posterior surface tessellate; discs of T 1 – T 2 very finely, minutely, sparsely punctate (i = 1 – 3 pd); T 2 apical impressed area very minutely, sparsely punctate laterally (i = 2 – 4 pd). STRUCTURE. Head wide (length / width ratio = 0.94 – 0.99; holotype = 0.95); eyes weakly convergent below (UOD / LOD ratio = 1.14 – 1.30; holotype = 1.27); clypeus ⁴ / 5 below suborbital tangent; antennal sockets close (IAD / AOD <0.55); frontal line ending <2 OD below median ocellus; head about as long as broad (length / width 0.94 – 0.99); gena wider than eye; tegula small, ovoid, not produced mesally; inner metatibial spur pectinate, with 3 – 4 teeth; scutellum length 0.25; metapostnotum length 0.2, metapostnotum elongate (MMR ratio = 1.25), posterior margin sharply angled onto posterior surface; propodeum with lateral carina not reaching margin of dorsal surface. Male Unknown.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	distribution	Distribution Yucatán Peninsula and northern Chiapas.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC2FF8FFE31D876FDE40639.taxon	discussion	Remarks This species is a member of the informal L. comulum species group and corresponds to mOTU 6 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	description	urn: lsid: zoobank. org: act: 907458 CF- 52 CC- 464 C-A 761 - 66 B 9373 D 5153 Figs 6 H, 20 – 21, 25 B, 26 B, 27 B, 34 B	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	diagnosis	Diagnosis Females of L. (D.) nanotegula sp. nov. can be recognised by the diagnostic combination of tegula small, ovoid (tegula width / ITS <0.20), and impunctate; frons punctures much finer and denser than those of lower paraocular area; head broader than long (length / width 0.91 – 0.95); mesoscutum moderately sparsely punctate between parapsidal lines (i = 1 – 3 pd), becoming dense but not crowded laterad of parapsidal lines (i ≤ 1 pd); metapostnotum shiny to weakly tessellate with strong coarse rugae reaching posterior margin; and T 1 – T 3 apical impressed areas evenly covered with fine sparse punctures (i = 1 – 3 pd) with short simple setae arising from them (except absent on T 1 medially). Males can be recognised by the same characters (however, the single male available for study is missing the metasoma, so metasomabased diagnostic characters are uncertain); in addition, males have the paraocular area and lower frons with dense appressed tomentum. Differential diagnosis Females of L. (D.) nanotegula sp. nov. are most similar to those of L. (D.) milpa sp. nov. and L. (D.) ameshoferi sp. nov. For comparison with Lasioglossum (D.) ameshoferi see above in L. (D.) ameshoferi differential diagnosis; however, the male of that species is unknown. For comparison with L. (D.) milpa see above in L. (D.) milpa differential diagnosis.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	etymology	Etymology The specific epithet ‘ nanotegula ’ is a combination of the Latin nouns ‘ nanus ’ (‘ dwarf’) and ‘ tegula ’ (‘ roof tile’, literally ‘ covering instrument’, now applied to the sclerite covering the wing base). It refers to the small size of the tegula.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	materials_examined	Type material Holotype MEXICO – Yucatán • ♀; Mérida, 15 km S of University of Yucatán; [20.83 ° N, 89.62 ° W]; 7 Apr. 1997; R. W. Brooks leg.; ex Piscidia piscipula; SEMC SM 0105925. Paratypes GUATEMALA – Huehuetenango • 1 ♀; Jacaltenango, San Andrés; 15.7167 ° N, 91.7455 ° W; elev. 1027 m; 28 Feb. 2010; Miguel Cigarroa leg.; ECOAB. 43341 • 1 ♀; La Democracia, Camojaíto; 15.616 ° N, 91.8727 ° W; elev. 940 m; 1 Mar. 2010; Daniel Sánchez leg.; ECOAB. 43336 • 1 ♀; San Antonio Huista, Pinalito; 15.6653 ° N, 91.8618 ° W; elev. 963 m; 2 Mar. 2010; Jaime Florez leg.; ECOAB. 43339. MEXICO – Chiapas • 1 ♀; Arriaga, Ej. Adolfo López Mateos; 16.3463 ° N, 93.9741 ° W; elev. 367.5 m; 17 Jul. 2009; Carlos Balboa, Miguel Guzmán and Miguel Cigarroa leg.; ECOAB. 53487 • 1 ♀; same collection data as for preceding; 17 Nov. 2009; ECOAB. 53350 • 1 ♀; Arriaga, Paraje, Poza Verde; 16.3428 ° N, 93.952 ° W; elev. 465.5 m; 14 Mar. 2009; Carlos Balboa, Miguel Guzmán and Miguel Cigarroa leg.; ECOAB. 53314 • 1 ♀; same collection data as for preceding; 15 Jul. 2009; ECOAB. 53483 • 2 ♀♀; La Trinitaria, Carretera 190; 16.0424 ° N, 92.0179 ° W; elev. 1041 m; 15 Feb. 2014; Philippe Sagot leg.; ECOAB. 53398, ECOAB. 53399 • 1 ♀; Mapastepec, El Unión Los Olivos; 15.3083 ° N, 92.4738 ° W; elev. 315 m; 1 Apr. 2005; M. Rincón, Ricardo Ayala Barajas, R. Vandame and Miguel Guzmán leg.; ECOAB. 43760 • 1 ♀; Ocosingo, El Rosario; 16.8859 ° N, 92.2742 ° W; elev. 1118 m; 11 Feb. 2010; Philippe Sagot leg.; ECOAB. 43281 • 2 ♀♀; Ocosingo, Sibaca; 16.9447 ° N, 92.1839 ° W; elev. 1107 m; 12 Apr. 2010; Carlos Balboa leg.; ECOAB. 43271, ECOAB. 43331 • 1 ♀; San Juan Cancuc, Tzuluwitz; 16.894 ° N, 92.4019 ° W; elev. 1270 m; 6 Apr. 2010; Philippe Sagot leg.; ECOAB. 43325. – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC. – Yucatán • 1 ♂; same collection data as for holotype; SEMC SM 0105924 (photographed) • 1 ♀; Tah Dziú; [20 ° 10 ′ 06.9 ″ N, 88 ° 55 ′ 36.2 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 237; ZMH 842031 • 2 ♀♀; Uxmal Ruins, 16 km SW of Muna; [20.36 ° N, 89.77 ° W]; 14 Feb. 1987; Charles D. Michener leg.; SEMC. Other material examined MEXICO – Jalisco • 1 ♀; Chamela; [19.5 ° N, 105.04 ° W]; 26 Sep. 1985; R. J. McGinley leg.; USNM • 1 ♀; same collection data as for preceding; 30 Sep. 1985; USNM • 2 ♀♀; Guadalajara; [20.65 ° N, 103.35 ° W]; J. C. Crawford leg.; USNM • 1 ♀; Mascota; [20.53 ° N, 104.79 ° W]; 17 Jul. 1989; R. J. McGinley leg.; USNM. – Yucatán • 1 ♂; Tah Dziú; 6 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 452 b; ZMH 839503 • 1 ♀; Muna; [20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W]; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 570; ZMH 842054 • 1 ♀; Tixmehuac; [20 ° 15 ′ 52.4 ″ N, 89 ° 08 ′ 58.1 ″ W]; 15 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 410; ZMH 842034 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 488 b; ZMH 842036 • 1 ♂; Xaya, [20 ° 16 ′ 51.70 ″ N, 89 ° 11 ′ 28.70 ″ W], 5 Aug. 2011; Quezada-Euán and Moo-Valle leg.; original label 621 c; ZMH 839508 • 1 ♀; Tixcuytun; [20 ° 12 ′ 21.80 ″ N, 89 ° 09 ′ 17.50 ″ W]; 7 Jun. 2011; Quezada-Euán and Moo-Valle leg.; original label 493; ZMH 842037 • 1 ♀; Muna; [20 ° 28 ′ 15.7 ″ N, 89 ° 46 ′ 53.5 ″ W]; 22 Jul. 2011; Quezada-Euán and Moo-Valle leg.; original label 569 a; ZMH 842068 • 1 ♀; Yaxcopil; [20 ° 4 ′ 4.10 ″ N, 88 ° 54 ′ 23.80 ″ W]; 1 Aug. 2011; QuezadaEuán and Moo-Valle leg.; original label 605 b; ZMH 842069 • 1 ♀; Alfonso Caso; [20 ° 05 ′ 02.5 ″ N, 89 ° 09 ′ 39.3 ″ W]; 25 Oct. 2011; Quezada-Euán and Moo-Valle leg.; original label 92; ZMH 842066. Floral records FABACEAE Juss.: Piscidia L.: P. piscipula (L.) Sarg. • SOLANACEAE Adans.: Capsicum L.: C. chinense Jacq. DNA barcodes Seventeen sequences available (BOLD process IDs: LDSPS 040 - 15 to LDSPS 051 - 15, LDSPS 096 - 15, LDSPS 097 - 15, LDSPS 100 - 15 to LDSPS 102 - 15). These sequences are highly variable (maximum intraspecific p-distance 1.3 %; minimum interspecific distance, to L. aureoviride sp. nov., 3.96 %). The other sequences not from Yucatán are much less variable, with a clear barcode gap (maximum intraspecific p-distance 0.2 %; minimum interspecific distance, to L. nanotegula sp. nov., 4.4 %). This species is a member of the informal L. comulum species group and corresponds to mOTU 4 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	description	Description Female (holotype) MEASUREMENTS. Length 4.45 mm; head length 1.21 mm; head width 1.33 mm; fore wing length 2.93 mm. Six female paratypes measured: length 4.25 – 4.46 mm; head length 1.15 – 1.21 mm; head width 1.21 – 1.33 mm; fore wing length 2.91 – 2.94 mm. COLOUR. Head and mesosoma metallic blue-green to olive green; clypeus apical half black; supraclypeal area with golden reflection; scape and pedicel black, F 1 – F 10 black, F 8 – F 10 becoming brown ventrally; wing membrane subhyaline, subcosta dark brown, venation and pterostigma otherwise light brown; legs dark brown with distitarsi light brown; metasoma dark brown with rims of terga and sterna lighter reddish brown. PUBESCENCE. Dull white. Head and mesosoma with abundant long setae (1 – 2.5 OD); lower paraocular area and gena with sparse subappressed tomentum; propodeum with abundant plumose setae on lateral and posterior surfaces (2 OD); T 1 with with dense complete setose fan; T 2 – T 3 with small basolateral patches of appressed tomentum covering less than half length of segment laterally; disc of T 4 with sparse appressed tomentum throughout; T 1 – T 5 evenly covered with dense, short, simple setae, about half as long on T 1 – T 2, becoming long and plumose laterally (1 – 2.5 OD); tibia and tarsal segments with plumose light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and densely punctate (i ≤ 1 pd); supraclypeal area shiny and moderately sparsely punctate (i = 1 – 2 pd); paraocular area and antennocular area shiny and very densely punctate (i <0.5 pd); upper paraocular area and frons with fine crowded punctures (i = 0 pd); gena and postgena shiny; mesoscutum moderately sparsely punctate between parapsidal lines (i = 1 – 3 pd), becoming dense and crowded laterad of parapsidal lines (i ≤ 1 pd); mesepisternum imbricate and densely punctate (i ≤ 1 pd); metapostnotum shiny to weakly tessellate, with strong coarse rugae reaching posterior margin; propodeum with lateral surface and posterior surface weakly tessellate; T 1 – T 3 minutely, sparsely punctate (i = 1 – 3 pd); T 1 apical impressed area impunctate medially. STRUCTURE. Head wide (length / width ratio = 0.91 – 0.95; holotype = 0.91); eyes weakly convergent below (UOD / LOD ratio = 1.23 – 1.28; holotype = 1.23); clypeus ⁴ / 5 below suborbital tangent; antennal sockets close (IAD / AOD <0.52); frontal line ending> 2.5 OD below median ocellus; head broader than long (length / width 0.91 – 0.95); gena narrower than eye; inner metatibial spur with three teeth; tegula small, ovoid, not produced mesally (tegula width / ITS <0.215); scutellum length 0.28; metapostnotum length 0.22, metapostnotum elongate (MMR ratio = 1.27), posterior margin rounded onto posterior surface; propodeum with oblique carina straight and lateral carina not reaching margin of dorsal surface. Male MEASUREMENTS. Length 3.58 mm; head length 1.05 mm; head width 1.09 mm; fore wing length 2.57 mm. COLOURATION. Head and mesosoma metallic blue-green; scape and pedicel dark brown; F 1 – F 10 dark brown dorsally, light brown ventrally; legs dark brown with tibial bases, apices, and tarsi light brown. PUBESCENCE. Dull white. Head and mesosoma with abundant plumose short setae (0.5 – 2 OD); paraocular area and lower frons with dense appressed tomentum; clypeus, supraclypeal area, and gena with sparse appressed tomentum; propodeum with abundant plumose setae on lateral and posterior surfaces (1 – 2 OD); S 3 – S 5 pubescence short (1 – 2 OD), suberect, and weakly plumose, appearing simple at <40 × magnification; tibia and tarsal segments with plumose light-yellow setae. SURFACE SCULPTURE. Clypeus shiny and sparsely punctate (i = 1 – 3 pd); supraclypeal area shiny and moderately sparsely punctate (i = 1 – 2 pd); lower paraocular area and antennocular area shiny and densely punctate (i <1 pd); upper paraocular area and frons shiny with crowded punctures (i = 0 pd); ocellocular area shiny and densely punctate (i ≤ 1 pd); gena and postgena weakly imbricate-rugulose, mostly shiny; mesoscutum shiny and sparsely punctate between parapsidal lines (i = 1 – 3 pd), becoming moderately denser laterad of parapsidal lines (i ≤ 1.5 pd); mesepisternum shiny and densely punctate (i <1 pd); metapostnotum shiny with strong or somewhat finer rugae not reaching onto propodeum dorsolateral slope except at base; propodeum with lateral surface and posterior surface shiny and moderately densely punctate (i = 1 – 2 pd) and with oblique carina absent. STRUCTURE. Head wide (length / width ratio = 0.97 – 0.99); eyes weakly convergent below (UOD / LOD ratio = 1.55); clypeus ⁴ / 5 below suborbital tangent; antennal sockets close (IAD / AOD <1.07); frontal line ending 2.5 OD below median ocellus; gena narrower than eye; scutellum length 0.22; metapostnotum length 0.17, metapostnotum elongate (MMR ratio = 1.29); genitalia not examined.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	distribution	Distribution Yucatán Peninsula, northern Chiapas, and northern Guatemala, possibly also the Pacific coast to Jalisco. The five outlier Jalisco specimens seem morphologically indistinguishable from this species, but until additional records are found to fill the distribution gap, the possibility that they are a cryptic species must be considered and they are therefore excluded from the paratype series.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFC7FF92FEA2DE70FD7A076D.taxon	discussion	Remarks Uncommon. This species is a member of the informal L. comulum species group and corresponds to mOTU 4 in Landaverde-González et al. (2017 a).	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFDAFF92FE69DF2DFAFE049C.taxon	description	Fig. 33 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFDAFF92FE69DF2DFAFE049C.taxon	materials_examined	Type material Holotype GUATEMALA – Izabal • 1 ♀; Quirigua; [15.27 ° N, 89.04 ° W]; Feb. – Mar. 1912; W. P. Cockerell leg.; USNM ENT 00535076. Other material examined MEXICO – Yucatán • 1 ♂; Alfonso Caso, 10 km W of Tzucacab; [20.08 ° N, 89.15 ° W]; 12 Feb. 1987; Charles D. Michener leg.; ex Viguiera dentata; SEMC.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFDAFF92FE69DF2DFAFE049C.taxon	discussion	Remarks Rare on the Yucatán Peninsula. The identification of this species is somewhat uncertain because only a single male was discovered in the Yucatán Peninsula, while the holotype is a female. The specimen analysed is believed to be L. deceptor and not the male of L. tropicior based on the relatively long face and moderately dense mesoscutum punctures (i = 1 – 2 pd), which agree more closely with the holotype of L. deceptor than with L. tropicior. Furthermore, both these species were described from the same type locality, so it is assumed that if one occurs on the Yucatán Peninsula, the other is also likely to occur there.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF91FE63DA5EFDEE070A.taxon	description	Figs 22 A, 23 A, 24 A, 34 A	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF91FE63DA5EFDEE070A.taxon	materials_examined	Type material Holotype MEXICO – ♀; on / around Orizaba volcano; [19 ° N, 97.3 ° W]; “ 8. M. 1856 ”; M. Salle leg.; NHMUK 010265368. Other material examined MEXICO – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM 0753053 • 2 ♂♂; same collection data as for preceding; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM 0730146, SM 0753052 • 1 ♀; Reforma; [18.81 ° N, 88.57 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF91FE63DA5EFDEE070A.taxon	discussion	Remarks Uncommon on the Yucatán Peninsula (four specimens examined in the region); more common in Veracruz. The very large head and rectangular, strongly toothed clypeus apical margin are unmistakable diagnostic characters for this species. We consider the identifications highly reliable despite the distance between Orizaba and Quintana Roo.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF90FE68DF0FFDF4027F.taxon	description	Fig. 24 B	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF90FE68DF0FFDF4027F.taxon	materials_examined	Type material Holotype GUATEMALA – Izabal • 1 ♀; Quirigua; [15.27 ° N, 89.04 ° W]; 20 Feb. 1912; W. P. Cockerell leg.; ex Distimake quinquefolius; USNM ENT 00535200. Other material examined MEXICO – Campeche • 1 ♀; Ruinas Edzna; [19.597 ° N, 90.23 ° W]; 24 Jun. 1966; University of Kansas Mexico Expedition leg.; SEMC. – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89 ° N, 88.65 ° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC • 1 ♀; 23 km W of Felipe Carrillo Puerto; [19.58 ° N, 88.27 ° W]; 12 Oct. 1986; Charles D. Michener leg.; SEMC.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
03A287B8FFD9FF90FE68DF0FFDF4027F.taxon	discussion	Remarks Uncommon on the Yucatán Peninsula (three specimens examined). The specimens closely match images of the holotype and agree with the original description (Ellis 1914), and the type locality in eastern Guatemala is on the southern edge of the Yucatán Peninsula, but we still consider the identifications somewhat uncertain because of the likelihood that this species (along with L. deceptor, L. flaveriae (Mitchell, 1960), L. gundlachii (Baker, 1906), L. liguanense (Sandhouse, 1924), and possibly L. exiguum and L. umbripenne (Ellis, 1913 )) is part of a large and diverse complex including many undescribed species. Morphologically similar specimens which cannot be confidently assigned to a described species are common in other areas of Mexico.	en	Landaverde-González, Patricia, Gardner, Joel, Moo-Valle, Humberto, Quezada-Euán, José Javier G., Ayala, Ricardo, Husemann, Martin (2023): Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico. European Journal of Taxonomy 862 (1): 1-65, DOI: 10.5852/ejt.2023.862.2079, URL: http://dx.doi.org/10.5852/ejt.2023.862.2079
