taxonID	type	description	language	source
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	description	(Figs 1, 2, 5, 6, 9 – 11, 15)	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	materials_examined	Type locality. Brazil: Amazonas State, Manaus County, “ Reserva Florestal Adolpho Ducke, Igarapé Bolívia ” (02 º 59 ’ 14 ” S 059 º 56 ’ 30 ” W). Type material. Holotype ♂: Brazil: Amazonas State, Manaus County, “ Reserva Florestal Adolpho Ducke, Igarapé Bolívia ” (02 º 59 ’ 14 ” S 059 º 56 ’ 30 ” W); 65 m a. s. l.; 25 ºC temp., 14 conductivity, 4.9 pH, sandy stream, forest; 06. xi. 2008; leg. U. Neiss, F. Sales, P. Vilela (INPA). [red holotype label]. Paratypes (7): same data as holotype, except 14. viii. 2002; leg. C. Benetti [red paratype label]; “ Reserva Florestal Adolpho Ducke, Igarapé do Ipiranga ” (02 º 59 ’ 36 ” S 59 º 53 ’ 25 ” W); 68 m a. s. l.; 02. vii. 2015; leg. A. Pes, G. Gomes, P. Barcelos, W. Xavier (INPA, 3 ♂) [red paratype label].	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	diagnosis	Diagnosis. Hydrodessus ducke sp. n. can be distinguished from other Hydrodessus species by the following combination of characters: body size (total length: 2.65 – 2.8 mm); body outline only slightly discontinuous between pronotum and elytron; coloration evenly dark red-brownish (Figs 1, 2); lateral elytral carina extending to about half length of elytron (Fig. 5); prosternal process broad with lateral margins subparallel and apex truncate (Fig. 6); metaventrite carinae and metacoxal lines approximately continuous (Fig. 6); median lobe in lateral aspect broadly and evenly curved with rounded apex (Fig. 9), in ventral aspect with lateral margins parallel and apex strongly incised medially (Fig. 10).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	description	Description. Habitus (Figs 1, 2). Body shape oval, broad, apically slightly acuminate; lateral body outline only slightly discontinuous between pronotum and elytron; elytra apically pointed, slightly dehiscent. Measurements. TL = 2.65 – 2.8 mm, GW = 1.35 – 1.45 mm, PW = 1.15 – 1.25 mm, HW = 0.75 – 0.8 mm, EW = 0.4 – 0.45 mm, TL / GW = 1.9 – 2.0, HW / EW = 1.69 – 1.83. Coloration (Figs 1, 2). Head, pronotum and elytra evenly dark red-brownish; antennae, palps and legs redbrownish; venter evenly dark red-brownish with abdominal ventrites slightly lighter. Sculpture and structure. Head broad, short, anterior clypeal margin rounded; surface shiny, covered with fine punctures; microreticulation not visible at 100 x; eyes relatively large. Pronotum with lateral margins curved, widest at posterior margin; greatest width of pronotum narrower than elytral base; lateral bead fine; surface shiny with distinctive but weakly marked punctures, coarser than on head; microreticulation not visible at 100 x. Elytra elongate, apically pointed and slightly dehiscent, lateral margins evenly curved, greatest width at basal third; lateral carina distinct, extending a little beyond elytral half (Fig. 5); surface shiny with weakly marked punctures, with short setae mainly on apical third; microreticulation not visible at 100 x. Ventral surface shiny, densely punctate; microreticulation not visible at 100 x. Prosternum medially tectiform and setose; prosternal process broad, lateral margins subparallel, apex truncate (Fig. 6). Metaventral platform not strongly constricted anteriorly; metaventrite with anterior process broad, truncate; metaventrite carinae well-marked, somewhat divergent posteriorly, ending near anterior ends of metacoxal lines (metaventrite carinae and metacoxal lines approximately continuous) (Fig. 6). Legs shiny, finely punctate; metacoxal lines broadly separated, slightly sinuate, divergent anteriorly but anterior ends somewhat converging; metatrochanter somewhat offset, apically broadly pointed; pro- and mesotibiae moderately slender; metatibia with distinctive posteroapical brush of setae. Abdomen shiny, weakly punctate; ventrite VI apically somewhat narrowly rounded. Male genitalia. Median lobe in lateral aspect (Fig. 9) broadly and evenly curved, basal region broad, medial and distal portions relatively slender, apex rounded; in ventral aspect (Fig. 10) broad, lateral margins subparallel, slightly narrowed at basal portion; apex with lateral angles curved, strongly incised medially. Lateral lobes (Fig. 11) broad basally, distally gradually narrowed, apex rounded with series of short setae. Sexual dimorphism. Male pro- and mesotarsi I – III slightly broader than in female, ventrally with several large adhesive setae; posteroapical brush of setae on male metatibiae composed of adhesive setae.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	etymology	Etymology. This species is named after the “ Reserva Florestal Adolpho Ducke ” where the type locality is located. The name is a noun in the nominative singular standing in apposition.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47ADE24DBF7FD10FD1A0445.taxon	distribution	Distribution. Northern Brazil, currently only known from the state of Amazonas (Fig. 15). Habitat. Specimens were collected in shaded forest streams, with sandy bottom and root as substrate, at 68 – 107 m a. s. l. Taxonomic remarks. Hydrodessus ducke sp. n. is similar to H. continuus Miller, 2016, H. concolorans Miller, 2016, H. brasiliensis (Guignot, 1957) and H. octospilus (Guignot, 1957) in having the lateral elytral carina long (more than 1 / 4 elytral length), prosternal process broad and metaventral platform not strongly constricted anteriorly, but can be differentiated from these species in the pronotum with lateral margins curved, widest at posterior margin, and in the shape of the male genitalia. The new species differs from H. continuus in having the metacoxal lines slightly divergent anteriorly, the lateral elytral carina extending to about half length of elytron and the prosternal process with lateral margins subparallel and not constricted, whereas H. continuus has the metacoxal lines broadly divergent anteriorly, the lateral elytral carina short, about 1 / 3 length of elytron, and the prosternal process widest at anterior angles, medially constricted. From H. concolorans, H. brasiliensis and H. octospilus the new species differs in having the metacoxal lines continuous with metaventrite carinae (metacoxal lines intersecting metaventrite carinae at distinct angle in the other species). Hydrodessus ducke sp. n. also differs from H. concolorans in having the greatest width of pronotum only slightly smaller than the greatest width across elytra (greatest width of pronotum considerably smaller than greatest width across elytra in H. concolorans) and in the length of elytral carina (about half of elytron length in the new species and 1 / 3 of elytron length in H. concolorans). Hydrodessus brasiliensis can be differentiated from the new species also in having the prosternal process distinctly constricted medially with prominent anterolateral lobes (prosternal process lacking lateral lobes and not constricted medially in the new species). Hydrodessus octospilus differs from H. ducke sp. n. in coloration, with head and pronotum orange-red and elytron with large, very diffuse pale areas anteriorly, subapically and at apex, whereas the new species has the head, pronotum and elytra evenly dark red-brownish.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B479DE25DBF7FAB6FB590382.taxon	description	(Figs 3, 4, 7, 8, 12 – 14, 17)	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B479DE25DBF7FAB6FB590382.taxon	materials_examined	Material examined. Holotype (♀) labeled: “ PERU: Madre de Dios: Rio Tambopata Res: 30 km SW Pto. Maldo- nado, 290 m a. s. l., 16 – 20 XI 1979 J. B. Heppner subtropical moist forest / HYDRODESSUS sp. P. J. S. [handwritten] / HOLOTYPE Hydrodessus latotibialis Miller, 2016 [red label with black line border]. ” Paratype (♀) same data as holotype, except for having only locality label. (holotype and paratype deposited in USNM). Additional material examined: 2 ♂, 1 ♀: Brazil: Pará State, Paragominas County (03 º 46 ’ 55 ” S 048 º 30 ’ 43 ” W), 22. vii. 2011, leg. J. Brito and V. Oliveira (INPA).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B479DE25DBF7FAB6FB590382.taxon	description	Description. Measurements. TL = 2.9 – 3.2 mm, GW = 1.4 – 1.5 mm, PW = 1.2 – 1.3 mm, HW = 0.8 – 0.9 mm, EW = 0.5 – 0.6 mm, TL / GW = 2.0 – 2.1, HW / EW = 1.5 – 1.7. Male genitalia. Median lobe bilaterally symmetrical; in lateral aspect (Fig. 12) with basal portion broad, medially evenly and broadly curved, subapically strongly narrowed, then sinuate to sharply pointed apex; in ventral aspect (Fig. 13) robust and broad, lateral margins slightly divergent to broadened apical third, then converging towards slightly convex apex. Lateral lobes (Fig. 14) broad basally, distally gradually narrowed, apex rounded with series of short setae. Sexual dimorphism. Male pro- and mesotarsi I – III slightly broader than in female, ventrally with several large adhesive setae; male mesotibia apically broader than in female. Variation. Little variation was observed among specimens, mainly in pronotal and elytral coloration and in elytral maculae which are stronger in some specimens from Brazil.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B479DE25DBF7FAB6FB590382.taxon	distribution	Distribution. Hydrodessus latotibialis is known from Brazil (Pará) and Peru (Madre de Dios) (Miller 2016) (Fig. 17). Habitat. Type specimens were collected from subtropical moist forest (Miller 2016). Specimens from Brazil were collected in a shaded forest stream, at 107 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B479DE25DBF7FAB6FB590382.taxon	discussion	Discussion. According to Miller (2016) this species has indistinct pale areas on elytra. However, we examined the holotype and the single paratype of H. latotibialis and found that the elytra have pale, somewhat diffuse but distinct yellow maculae basally, laterally, subapically and at apex, similar to H. maculatus Miller, 2016. Hydrodessus latotibialis is similar to H. maculatus, H. phyllisae Spangler, 1985 and H. tenuatus Miller, 2016 but differs from these species in the shape of the male median lobe, which in lateral view is medially evenly and broadly curved, subapically strongly narrowed, then sinuate to sharply pointed apex; in ventral view with lateral margins slightly divergent to broadened apical third, then converging towards apex. In addition, H. latotibialis differs from H. maculatus, H. phyllisae and H. tenuatus in having the apices of metaventrite carinae located well mediad to the anterior apices of metacoxal lines (metaventrite carinae and metacoxal lines approximately continuous in those species). The distance between the type locality from Peru and the new record from Brazil is surprising but not uncommon, since a similar distribution pattern is observed in other Hydrodessus species (e. g. H. keithi Miller, 2016).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7FC79FD3D05D2.taxon	materials_examined	Material examined. French Guiana: Régina (4 º 18 ’ N 052 º 08 ’ W); 22. xi. 2007; leg. D. Lohez (INPA, 10).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7FC79FD3D05D2.taxon	distribution	Distribution. Brazil (Amazonas), French Guiana (Régina *, Roura) (Makhan 2015), Guyana (Mazaruni-Potaro District), Suriname (Sipaliwini District) and Venezuela (Amazonas, Bolivar) (Miller 2016) (Fig. 16). Habitat. Specimens have been collected from a river margin, in a large sandy creek, in a muddy oxbow pond, in detrital pools by a forest stream, and from lights at night. The species appears to be mainly associated with margins of forest rivers (Miller 2016).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7FB19FEA40701.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Base da Serra do Aracá, Igarapé s / nome, mar- gem esquerda do Ig. da Cobra ” (00 º 52 ’ 13 ” N 63 º 27 ’ 13 ” W); 147 m a. s. l.; 02. viii. 2009; leg. N. Ferreira Jr., J. Nessimian, F. Salles, A. Santos, U. Neiss, J. Silva (INPA, 3). “ Base da Serra do Aracá, Igarapé da Anta (00 º 52 ’ 31 ” N 63 º 27 ’ 31 ” W); 113 m a. s. l.; 30. vii. 2009; leg. N. Ferreira Jr., J. Nessimian, F. Salles, A. Santos, U. Neiss, J. Silva (INPA, 1). São Gabriel da Cachoeira County, “ rio Querari ” (01 º 05 ’ N 69 º 51 ’ W); 07. iv. 1993; leg. C. Motta, R. Ferreira, J. Vidal, B. Matteo (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7FB19FEA40701.taxon	distribution	Distribution. Brazil (Amazonas *, Pará, São Paulo), Guyana (Mazaruni-Potaro District), Suriname (Sipaliwini District) and Venezuela (Amazonas) (Miller 2016) (Fig. 17). Habitat. Specimens have been collected from blacklights in tropical forests and from the margins of a river and a flooded forest stream (Miller 2016). Specimens from Brazil were collected in forest streams at 113 – 147 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7F96DFD560605.taxon	materials_examined	Material examined. Brazil: Amapá State, “ Serra do Navio, Rio Cachaço; Cachoeira do Fernando ” (00 º 53 ’ 18 ” N 052 º 01 ’ 22 ” W); 61 m a. s. l.; 02. viii. 2011; leg. A. Pes, P. Cruz, A. Fernandes (INPA, 1). Amazonas State, Presidente Figueiredo County, “ Igarapé Pantera ” (02 º 02 ’ 31 ” S 059 º 50 ’ 55 ” W); 05. ix. 2000; leg. A. Pes (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE25DBF7F96DFD560605.taxon	distribution	Distribution. Brazil (Amapá *, Amazonas *, Pará) (Miller 2016) (Fig. 17). Habitat. Specimens collected in rapids at 61 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE22DBF7F869FD950035.taxon	materials_examined	Material examined. Brazil: Amazonas State, Manaus County, “ Reserva Ducke, Igarapé do Ipiranga ” (02 º 59 ’ 36 ” S 59 º 53 ’ 25 ” W); 68 m a. s. l.; 02. vii. 2015; leg. A. Pes, G. Gomes, P. Barcelos, W. Xavier (INPA, 3). Pará State, Paragominas County (03 º 40 ’ 11 ” S 48 º 30 ’ 52 ” W); 24. viii. 2011; leg. V. Oliveira, J. Brito (INPA, 2).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B478DE22DBF7F869FD950035.taxon	distribution	Distribution. Brazil * (Amazonas, Pará) and Venezuela (Amazonas) (Miller 2016) (Fig. 16). Habitat. The two specimens in the type series were collected from leaf pack among rocks in small rainforest stream (Miller 2016, present paper).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FEB9FEA40229.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Base da Serra do Aracá, Igarapé do Jabuti ” (00 º 52 ’ 47 ” N 63 º 28 ’ 27 ” W); 125 m a. s. l.; 04. viii. 2009; leg. N. Ferreira Jr., J. Nessimian, F. Salles, A. Santos, U. Neiss, J. Silva (INPA, 4). “ Base da Serra do Aracá, Igarapé afluente da direita do Ig. da Cobra ” (00 º 52 ’ 34 ” N 63 º 27 ’ 03 ” W); 157 m a. s. l.; 02. viii. 2009; leg. N. Ferreira Jr., J. Nessimian, F. Salles, A. Santos, U. Neiss, J. Silva (INPA, 25). Manacapuru County, “ AM 352, Km 66, Ramal Comunidade Nova Esperança, Igarapé do Ouro, Sítio Capitão na Área, aprox. 8 Km adentro do ramal ” (03 º 02 ’ 25 ” S 060 º 46 ’ 31 ’’ W); 58 m a. s. l., 24.9 º C temp., 13.7 cond., 4.83 pH, sandy, forest; 25. iii. 2008; leg. J. Nessimian, R. Querino, M. Pepinelli, C. Azevedo, U. Neiss (INPA, 2). Manaus County, “ Reserva Ducke, Igarapé Acará ” (02 º 56 ’ 06 ” S 59 º 57 ’ 12 ” W); 08. viii. 2002; leg. C. Benetti (INPA, 1). “ Reserva Ducke, Igarapé Bolívia ” (02 º 59 ’ 14 ” S 59 º 56 ’ 30 ” W); 14. viii. 2002; leg. C. Benetti (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FEB9FEA40229.taxon	distribution	Distribution. Brazil * (Amazonas) and Suriname (Sipaliwini District) (Miller 2016) (Fig. 15). Habitat. Specimens were collected from “ forested creek margins ” (Miller 2016) and in forest stream at 58 – 157 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FC45FC9F0541.taxon	materials_examined	Material examined. Brazil: Pará State, Paragominas County, (03 º 07 ’ 41 ” S 46 º 52 ’ 20 ” W); 04. viii. 2011; leg. V. Oliveira, J. Brito (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FC45FC9F0541.taxon	distribution	Distribution. Brazil (Pará) (Miller 2016) (Fig. 16). Habitat. Specimens from Brazil collected in forest stream.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FBADFBB604E9.taxon	materials_examined	Material examined. Brazil: Amapá State, “ Tartarugalzinho, Igarapé do Henrique, BR 156 ” (01 º 45 ’ 56 ” N 050 º 52 ’ 40 ” W); - 1 m a. s. l.; 07. viii. 2011; leg. A. Pes, P. Cruz, A. Fernandes, N. Hamada (INPA, 1). Rondônia State, “ Rio Pacaás Novos, confluência com rio Negro Ocaia ” (11 º 11 ’ 04 ’’ S 64 º 51 ’ 16 ’’ W); 06. ix. 1999; leg. N. Hamada, U. Barbosa (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FBADFBB604E9.taxon	distribution	Distribution. Brazil (Amapá *, Pará, Rondônia *), Colombia (Meta) and Ecuador (Napo, Pastaza) (Miller 2016) (Fig. 17). Habitat. This species has been collected from blacklight traps (Miller 2016). Specimens from Brazil (Amapá) were collected in streams at - 1 m a. s. l, 25 ºC, 6.7 pH, 13 µScm- 1 conductivity.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FA05FE320795.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Igarapé Serrinha ” (00 º 25 ’ 25 ” N 63 º 23 ’ 47 ” W); 36 m a. s. l.; 29. vii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 2). “ Rio Jauarí, Comunidade Ucuqui, acampamento Sr. Miranda ” (00 º 48 ’ 06 ” N 63 º 29 ’ 02 ” W); 59 m a. s. l.; 23. vii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE22DBF7FA05FE320795.taxon	distribution	Distribution. Brazil * (Amazonas) and Venezuela (Amazonas) (Miller 2016) (Fig. 15). Habitat. Specimens have been collected along a forest river and at lights (Miller 2016) and in forest streams at 36 – 59 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE23DBF7F8D9FACA0069.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Base da Serra do Aracá, Igarapé s / nome, margem esquerda do Ig. da Cobra ” (00 º 52 ’ 13 ” N 63 º 27 ’ 13 ” W); 147 m a. s. l. 02. viii. 2009; leg. N. Ferreira Jr., J. Nessimian, F. Salles, A. Santos, U. Neiss, J. Silva (INPA, 6). Suriname: Sipaliwini district, Sipaliwini savvana nat. res. near bascamp (2 º 00.46 ’ N 55 º 59.08 ’ W); along river margin; 295 m a. s. l.; 31. iii. 2017; leg. A. Short; SR 17 - 0331 - 02 A (SEMC, 5).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47FDE23DBF7F8D9FACA0069.taxon	distribution	Distribution. Brazil * (Amazonas), Guyana (Region IX), Suriname * (Sipaliwini) and Venezuela (Amazonas) (Mill- er 2016) (Fig. 16). Habitat. Specimens were “ seined from rocks in rapids ” and “ netted along margins ” of the Rio Baria. They have also been found in creeks and at blacklight in a rainforest (Miller 2016) and along river margin at 295 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FE8EFDC20363.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Igarapé Serrinha ” (00 º 25 ’ 25 ” N 63 º 23 ’ 47 ” W); 36 m a. s. l.; 05. viii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FE8EFDC20363.taxon	distribution	Distribution. Brazil * (Amazonas) and Venezuela (Miller 2016) (Amazonas) (Fig. 15). Habitat. Nearly all known specimens were collected at black light (Miller 2016). Specimens from Brazil were collected in forest stream at 36 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FDF4FE390223.taxon	materials_examined	Material examined. Brazil: Amazonas State, Manicoré County (08 º 26 ’ 15 ” S 61 º 45 ’ 02 ” W); 06. vii. 2017; leg. N. Hamada, Desidério, G., Cruz, P., Silva, J. (INPA, 13). Pará State, Paragominas County, (03 º 07 ’ 41 ” S 46 º 52 ’ 20 ” W); 04. viii. 2011; leg. V. Oliveira, J. Brito (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FDF4FE390223.taxon	distribution	Distribution. Brazil (Amazonas *, Pará), Guyana (Mazaruni-Potaro District, Region IX), Paraguay (Paraguari) and Venezuela (Amazonas) (Miller 2016) (Fig. 17). Habitat. Hydrodessus octospilus has been collected from blacklights, forest creeks and river margins (Miller 2016, present paper).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FC48FB3805CB.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County, “ Rio Demeni, pensilvania, tronco, raízes ” (00 º 23 ’ 53 ” S 062 º 53 ’ 18 ” W); 26. ix. 2014; leg. A. Pes, G. Gomes, D. Copalni (INPA, 2). “ Rio Aracá, pensilvania, areia, kinon, vegetação pendente; raízes, troncos ” (00 º 24 ’ 13 ” S 062 º 55 ’ 57 ” W); 25. ix. 2014; leg. A. Pes, G. Gomes, D. Copalni (INPA, 3). “ Rio Aracá, pensilvania ” (00 º 24 ’ 54 ” S 062 º 56 ’ 08 ’’ W); 25. ix. 2014; A. Pes, G. Gomes, D. Colpani (INPA, 3).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FC48FB3805CB.taxon	distribution	Distribution. Brazil * (Amazonas) and Venezuela (Amazonas) (Miller 2016) (Fig. 15). Habitat. Specimens were collected from a sandy forest stream with considerable plant material (leaves, branches) at margins (Miller 2016), in streams with roots, floating debris and from light traps.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FB20FC3F04E2.taxon	materials_examined	Material examined. Brazil: Amazonas State, Presidente Figueiredo County, “ Igarapé Pantera ” (02 º 02 ’ 31 ” S 059 º 50 ’ 55 ” W); 05. ix. 2000; leg. A. Pes (INPA, 1); same data except 03. viii. 2000 (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FB20FC3F04E2.taxon	distribution	Distribution. Brazil (Amazonas *, Pará) (Miller 2016) (Fig. 17). Habitat. Specimens from Amazonas State were collected in rapids.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FA08FB6307E6.taxon	materials_examined	Material examined. Brazil: Amazonas State, Presidente Figueiredo County, “ Igarapé Lajes ” (01 º 59 ’ 38 ’’ S 60 º 01 ’ 40 ’’ W); 08. ii. 2000; leg. A. Pes (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7FA08FB6307E6.taxon	distribution	Distribution. Brazil * (Amazonas), French Guiana (Régina) (Makhan 2015) and Suriname (Brokopondo, Sipaliwini) (Miller 2016) (Fig. 16). Habitat. Specimens were collected along the margins of a forest creek (Miller 2016) and rapids.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7F974FCF0068E.taxon	materials_examined	Material examined. Brazil: Amapá State, “ Tartarugalzinho, Igarapé do Henrique, BR 156 ” (01 º 45 ’ 56 ” N 050 º 52 ’ 40 ” W); - 1 m a. s. l.; 07. viii. 2011; leg. A. Pes, P. Cruz, A. Fernandes, N. Hamada (INPA, 2). Amazonas State, Barcelos County, “ Comunidade Ucuqui, Igarapé, trilha Sr. Miranda ” (00 º 46 ’ 51 ” N 63 º 27 ’ 39 ” W); 70 m a. s. l.; 21. vii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 1).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47EDE23DBF7F974FCF0068E.taxon	distribution	Distribution. Brazil * (Amapá, Amazonas), Guyana (Mazaruni-Potaro), Suriname (Sipaliwini) and Venezuela (Anzoátegui, Bolivar) (Miller 2016) (Fig. 16). Habitat. Specimens have been collected at blacklight in a forest clearing near streams (Miller 2016). Specimens from Brazil were collected in streams at - 1 – 70 m a. s. l.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47DDE20DBF7FF51FBBE0261.taxon	materials_examined	Material examined. Brazil: Amazonas State, Barcelos County “ Rio Demeni depois Com. Samauma ” (00 º 20 ’ 42 ’’ S 62 º 47 ’ 25 ” W); 30 m a. s. l.; 09. viii. 2009; leg. N. Hamada; A. Pes, R. Keppler, C. Azevedo; C. Monteiro, (INPA, 1). “ Igarapé Serrinha ” (00 º 25 ’ 25 ” N 63 º 23 ’ 47 ” W); 36 m a. s. l.; 05. viii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 6). “ Rio Aracá, acima do local do Barco Ancorado ” (00 º 24 ’ 39 ” N 63 º 23 ’ 12 ” W); 69 m a. s. l.; 06. viii. 2009; leg. N. Hamada, A. Pes, R. Keppler, C. Azevedo, C. Monteiro (INPA, 4). “ Rio Aracá, pensilvania ” (00 º 24 ’ 54 ” S 062 º 56 ’ 08 ’’ W); 25. ix. 2014; A. Pes, G. Gomes, D. Colpani (INPA, 1). Presidente Figueiredo County, “ Sitio Corredeira Santo Amaro ” (02 º 02 ’ 21 ” S 59 º 50 ’ 43 ” W); 18. viii. 2011; leg. A. Pes (INPA, 1). “ Igarapé Lajes ” (01 º 59 ’ 38 ’’ S 60 º 01 ’ 40 ’’ W); 08. ii. 2000; leg. A. Pes (INPA, 1). “ Igarapé Pantera ” (02 º 02 ’ 31 ” S 059 º 50 ’ 55 ” W); 04. vii. 2000; leg. A. Pes, (INPA, 3). Roraima State, Amajari County, “ Serra do Tepequém, Igarapé Preto, Cachoeira Laje Preta ” (3 º 36.38 ’ N 61 º 42.88 ’ W); stream margins in forested área, below seeps; 618 m a. s. l.; 14. i. 2018; leg. A. Short, C. Benetti, L. Santana; BR 18 - 0114 - 04 C (SEMC, 20).	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
03E5D649B47DDE20DBF7FF51FBBE0261.taxon	distribution	Distribution. Brazil * (Amazonas, Roraima), Suriname (Brokopondo, Sipaliwini) and Venezuela (Amazonas) (Miller 2016) (Fig. 15). Habitat. This species has been collected from waterholes in a forest stream, tiny forest pools, large detrital pools, large sandy creek, and along a stream (Miller 2016). In this study it was collected in rapids, shaded forest stream at 30 m a. s. l., below seepage at 618 m a. s. l., and from light traps.	en	Benetti, Cesar J., Michat, Mariano C., Hamada, Neusa (2020): Hydrodessus ducke sp. n. and new records of other species of the genus (Coleoptera, Dytiscidae, Bidessini). Zootaxa 4743 (1): 47-60, DOI: https://doi.org/10.11646/zootaxa.4743.1.4
