taxonID	type	description	language	source
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	description	(Figs. 1 – 3)	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	materials_examined	Material examined: Holotype male, No. GD-AR- 2002100301, stream, Dinghushan National Nature Reserve, Zhaoqing City, Guangdong Province, China (23 ° 10 ’ N, 112 ° 31 ’ E; alt. 1000 m), 3 - X- 2002, Jianjun Guo leg. Paratype, 0 / 1 / 0, No. GD-AR- 2002100302, same data as holotype.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	diagnosis	Diagnosis. D 3 on big humps and each with a small protrusion bearing D 3 gland; petiole well-developed, the median somewhat contracted and the end slightly enlarged. Ligulate process extending beyond posterior margin of petiole, and approximately triangle-shaped and nearly straight posteriorly in dorsal view.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	description	Description. Male (n = 1): Idiosoma L 1126 (including petiole), W 738, L / W ratio 1.5. Anterior margin of idiosoma slightly concave. Dorsal furrow incomplete, and not reaching to the middle of the pygal lobe’s dorsum; dorsal shield W 419, anterior margin nearly round (Fig. 1 B). Dorsal humps well developed, directed upward, and with a small protrusion bearing D 3 gland near the top of each. Petiole well-developed, L 114, the median somewhat narrowed, and the end slightly widened in dorsal view; ligulate process extending beyond posterior margin of petiole, approximately triangle-shaped and almost straight posteriorly (Fig. 1 C). ACG medium L 156; Gb – Cx-IV, 532; Gb – Gp, 593; Gb – Ep, 845; Cx-IV posterior angles undeveloped (Fig. 1 A). Inverted T-shaped cuticular structure between the glands of D 4 undeveloped, only with horizontal ridge (Fig. 1 D); Ap evenly extending from Gp to the sides of the body (Fig. 1 A, 1 C). L of palp segments: P- 1, 30; P- 2, 65; P- 3, 53; P- 4, 97; P- 5, 67; P- 2 with three dorsal setae; P- 3 medially with two setae near anterior margin (Fig. 1 E). L of I-L- 1 – 6: 52, 124, 133, 164, 152, 179 (Fig. 2 A). L of II-L- 1 – 6: 56, 115, 135, 147, 161, 196. L of III-L- 1 – 6: 54, 116, 150, 180, 174, 199. L of IV-L- 1 – 6: 144, 200, 255, 342, 129, 114. Spur of IV-L- 4 more than the half length of IV-L- 5. Number of swimming setae: II-L- 3 3, II-L- 4 7, II-L- 5 6; III-L- 3 8 (Fig. 2 B), III-L- 4 9, III-L- 5 7; IV-L- 3 14 (Fig. 2 C), IV-L- 4 16 (including five short swimming setae on the spur), IV-L- 5 9 (Fig. 2 D). Female (n = 1): Female (n = 1): Idiosoma L 1194, W 1042, L / W ratio 1.1; dorsal furrow complete; D 1 glands on the dorsal humps (Fig. 3 B and C). Cx-I and Cx-II not extending beyond anterior margin of idiosoma. Medial margin of Cx-IV longer than medial margin of Cx-III. Posteromedial corner of Cx-IV rounded. Gp approximately heartshaped, L 137 and W 152 and flanked by relatively long wing shaped Ap. ACG medium L 190; Gb – Cx-IV, 495; Gb – Gp, 609; Gb – Ep, 944. Ap short, and narrow laterally towards the distal (Fig. 3 A); L 137 and W 152; (Fig. 3 A). L of palp segments: P- 1, 17; P- 2, 76; P- 3, 55; P- 4, 118; P- 5, 57. P- 2 medially with two setae near anterior margin (Fig. 3 D). L of I-L- 1 – 6: 52, 113, 156, 179, 167, 171 (Fig. 3 E). L of II-L- 1 – 6: 72, 144, 168, 197, 171, 190. L of III-L- 1 – 6: 66, 132, 169, 173, 179, 189. L of IV-L- 1 – 6: 120, 217, 217, 266, 194, 126. Number of swimming setae: II-L- 3 3, II-L- 4 8, II-L- 5 7; III-L- 3 8, III-L- 4 9, III-L- 5 7; IV-L- 3 17, IV-L- 4 15, IV-L- 5 14 (Fig. 3 F). Habitat. Pool in the stream bed with dead branches and rotten leaves.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	etymology	Etymology. Derived from the Latin word “ ancorale ” (anchor). In this new species, D 3 gland protrusion looks like an anchor.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE835FF93FA809D8DFBFAFD62.taxon	discussion	Remarks. The new species is very similar to Arrenurus (Arrenurus) cuspidator Müller, 1776 (Viets 1936) in general shape of idiosoma and petiole, but differs from the new species in the following points: (1) Dorsal humps directed upwards in the new species, but is directed towards the anterior margin of idiosoma in A. (A.) cuspidator. (2) Hyaline membrane is not obvious in the new species, but obvious in A. (A.) cuspidator. (3) Caudal humps with V 2 and V 3 are developed, beyond the posterior margin of the body in the new species, but undeveloped in A. (A.) cuspidator. (4) The humps of D 4 are wider in the new species than in A. (A.) cuspidator. The new species is close to Arrenurus (Arrenurus) antalyensis Gülle, Boyaci & Gülle, 2011 (Yunus et al. 2013) collected from Turkey, but they differ from each other by the following: (1) The petiole end is slightly enlarged in the new species, but obviously enlarged in A. (A.) antalyensis. (2) Cx-I and Cx-II not extending to the anterior margin of idiosoma in the new species, but extending beyond the anterior margin of idiosoma in A. (A.) antalyensis. (3) Dorsal humps are directed upwards in the new species, while titled forwards the anterior of idiosoma in A. (A.) antalyensis. (4) The pygal lobes are well-developed in the new species, but small in A. (A.) antalyensis; (5) Ligulate process is relatively short in the new species, but elongated in A. (A.) antalyensis.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	description	(Figs. 4 – 7)	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	materials_examined	Material examined: Holotype male, No. SD-AR- 2002082901, Weishan Lake, Jining City, Shandong Province, China (34 ° 27 ’ N, 117 ° 24 ’ E; alt 30 m), 29 - VIII- 2002, Jianjun Guo leg. Paratypes, 5 / 1 / 0, No. SD-AR- 2002082902 – SD-AR- 2002082907, same data as holotype.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	diagnosis	Diagnosis. Ligulate process extending beyond posterior margin of half-length of the petiole, and nail-shaped.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	description	Description. Male (n = 6): Idiosoma L 1002 (989 – 1145) (including petiole), W 740 (723 – 752), L / W ratio 1.4 (1.3 – 1.5). Anterior margin of idiosoma concave, eye-capsule relatively developed, distance between the eyes 220 (215 – 240). Dorsal furrow incomplete, and not reaching to the middle of the pygal lobe’s dorsum (Fig. 4 B). D 1, D 3, D 4 on humps (Fig. 4 C). Inverted T-shaped cuticular structure between the glands of D 4 complete but undeveloped; hyaline membrane covering the proximal portion of petiole. Petiole well-developed, L 180 (167 – 237); ligulate process extending beyond the posterior margin for almost half-length of the petiole, and nail-shaped (Fig. 4 C). Cx-I and Cx-II exceeding to anterior idiosoma margin, posterior margin of Cx-IV relatively developed (Fig. 4 A); Gb – Cx-IV, 400 (395 – 405); Gb – Gp, 590 (571 – 631); Gb – Ep, 751 (738 – 812). Ap wide at the base and relatively narrow at the ends, extending to the sides of the body (Fig. 4 A and C). L of palp segments: P- 1, 37 (33 – 40); P- 2, 67 (60 – 85); P- 3, 58 (56 – 63); P- 4, 91 (85 – 97); P- 5, 59 (54 – 68); P- 2 with three dorsal setae (Fig. 4 D). L of I-L- 1 – 6: 46 (46 – 52), 132 (132 – 139), 137 (133 – 140), 156 (156 – 162), 160 (156 – 171), 225 (225 – 231) (Fig. 5 A). L of II-L- 1 – 6: 55 (51 – 58), 140 (140 – 148), 145 (135 – 159), 177 (177 – 180), 170 (170 – 179), 241 (235 – 254); L of III-L- 1 – 6: 92 (89 – 95), 155 (155 – 159), 145 (145 – 157), 153 (153 – 163), 175 (173 – 182), 236 (231 – 245); L of IV-L- 1 – 6: 122 (122 – 127), 222 (219 – 233), 207 (205 – 216), 209 (209 – 217), 135 (124 – 137), 137 (127 – 145). Number of swimming setae: II-L- 3 3 (3 – 5), II-L- 4 8 (7 – 9), II-L- 5 6 (6 – 9) (Fig. 5 B); III-L- 3 7 (6 – 8), III-L- 4 8 (6 – 9), III-L- 5 6 (5 – 8) (Fig. 5 C); IV-L- 3 10 (10 – 11), IV-L- 4 14 (13 – 14) (including five short swimming setae on the spur), IV-L- 5 7 (7 – 9) (Fig. 5 D). Female (n = 1): Idiosoma L 1080, W 936, L / W ratio 1.2; anterior margin of idiosoma almost truncated, L 4 located on distinct posterolateral corner; distance between the eyes 228; dorsal furrow complete; D 1 on wide round humps (Fig. 6 B and 7 A). Anterior coxae not extending beyond anterior idiosoma margin; ACG medium L 190; Gb – Cx-IV, 434; Gb – Gp, 419; Gb – Ep, 814; Cx-IV mid-angle well-developed (Fig. 6 A). Gp L 121, W 167, large and round; Ap relatively wide in the proximal half, and relatively narrow in the latter half. L of palp segments: P- 1, 34; P- 2, 82; P- 3, 59; P- 4, 104; P- 5, 48 (Fig. 7 B). L of I-L- 1 – 6: 55, 128, 133, 171, 164, 161 (Fig. 7 C); L of II-L- 1 – 6: 53, 131, 155, 187, 190, 170; L of III-L- 1 – 6: 63, 125, 150, 170, 179, 172; L of IV-L- 1 – 6: 115, 224, 225, 224, 190, 167. Number of swimming setae: II-L- 3 4, II-L- 4 7, II-L- 5 7; III-L- 3 6, III-L- 4 7, III-L- 5 7; IV-L- 3 12, IV-L- 4 12, IV-L- 5 11 (Fig. 7 D).	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	biology_ecology	Habitat. Lakes.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	etymology	Etymology. Derived from the Latin word “ unguiculus ” (nail), it means that ligulate process of the petiole is nail-shaped.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE833FF92FA809F25FCCAF84B.taxon	discussion	Remarks. The new species is similar to Arrenurus (Arrenurus) distinctus Marshall, 1919. However, the new species differs from A. (A.) distinctus in the following points: (1) D 4 on a continuous big hump in the new species, but D 4 on separated relatively small humps in A. (A.) distinctus. (2) Ligulate process in the new species is well developed as extending beyond the posterior margin of a half the length of the petiole, and nail-shaped; but ligulate process is enlarged and petal-shaped in A. (A.) distinctus.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE830FF9FFA809A28FA9DF947.taxon	description	(Figs. 8 A – F)	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE830FF9FFA809A28FA9DF947.taxon	materials_examined	Material examined: No. HLJ-AR- 1996081901, Hulan River, Yichun City, Heilongjiang Province, China (46 ° 54 ′ N, 128 ° 11 ′ E; alt. 230 m), 19 - VIII- 1996, Daochao Jin leg. Paratype, 0 / 0 / 0,	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE830FF9FFA809A28FA9DF947.taxon	description	Description. Male (n = 1): Idiosoma L 704 (including petiole), W 399, L / W ratio 1.8; anterior margin of idiosoma round, and wider than the posterior margin; dorsal shield W 304; distance between the eyes 152. Dorsal furrow posteriorly narrowed (Fig. 8 B). D 4 on wide round humps (Fig. 8 C). Cx-IV median suture lines much wider than the other coxae and posterior edges nearly straight. The tips of Cx-I and Cx-II moderately beyond the anterior margin of idiosoma (Fig. 8 A). Gb approximately “ U ” shaped, ACG medium L 114, Gb – Cx-IV, 214; Gb – Gp, 33; Gb – Ep, 578 (Fig. 8 A). Ap with five pairs of genital setae, of which two pairs located on the anterior edge near to Gp and three pairs located on the posterior edge (Fig. 8, A and C). L of palp segments: P- 1, 27; P- 2, 51; P- 3, 49; P- 4, 72; P- 5, 38, P- 2 with three ventral setae (Fig. 8 D). L of I-L- 1 – 6: 45, 83, 84, 120, 132, 132 (Fig. 8 E); L of II-L- 1 – 6: 38, 77, 87, 106, 114, 119; L of III-L- 1 – 6: 43, 88, 98, 119, 127, 142; L of IV-L- 1 – 6: 74, 133, 127, 217, 124, 143. Number of swimming setae: II-L- 3 5, II-L- 4 7, II-L- 5 6; III-L- 3 4, III-L- 4 4, III-L- 5 6; IV-L- 3 6, IV-L- 4 7 (including four short swimming setae on the spur), IV-L- 5 6 (Fig. 8 F). Habitat. Rivers.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
03AAB41AE830FF9FFA809A28FA9DF947.taxon	discussion	Remarks. The specimen from China shows general conformity with that from Turkey in the following features: Cx-IV median suture lines much wider than other coxae, posterior suture lines nearly straight, the tips of Cx-I and Cx-II moderately beyond the anterior margin of idiosoma, and the same structure of the genital area, and constitutes the first record of A. (T.) isikliensis Boyaci & Özkan, 2004 for the Chinese fauna (Boyaci & Özkan 2004). However, the two populations are slightly different in the following: (1) P- 2 with three dorsal setae in the Chinese specimen, but P- 2 with seven dorsal setae in the one from Turkey. (2) The number of swimming setae on IV-L is larger in the Chinese specimen than Turkish. The differences observed can be due to geographical variation. The Chinese specimen is also similar to Arrenurus (Truncaturus) viktorovi (Tuzovskij 2020) from North America. However, the main differences are in the following points: (1) The Ap is relatively long and narrow in the Chinese specimen, but the Ap is wider and round in the North American species. (2) Cauda is developed, but the petiole is not obvious in the Chinese specimen while the cauda is shorter and with a short petiole in A. (T.) viktorovi.	en	Zheng, Yulin, Gu, Xinyao, Guo, Jianjun, Zhang, Runzhi (2021): Two new species and one new record species of genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia, Arrenuridae) from China. Zootaxa 5072 (1): 63-72, DOI: https://doi.org/10.11646/zootaxa.5072.1.7
