taxonID	type	description	language	source
5E2587BDA054A839FF22FECEFAC76C33.taxon	description	(Figs 1 – 2)	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA054A839FF22FECEFAC76C33.taxon	materials_examined	Material examined. Holotype male, GUGC, Slide No. AH-AR- 2016070701, Huangshan, Huangshan City, Anhui Province, P. R. China (118 ° 31 ' 73 ′′ N, 29 ° 70 ′ 92 ′′ E; alt. 1020 m), 07 - VII- 2016, Xinyao Gu leg.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA054A839FF22FECEFAC76C33.taxon	diagnosis	Diagnosis. Hyaline petiole tongue-shaped, small humps lateral to petiole; Hyaline membrane trapezoid; Ap approximately triangular.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA054A839FF22FECEFAC76C33.taxon	description	Description. Male (n = 1; Figures 1 – 2): Idiosoma L 584 (including petiole), W 507, L / W ratio 1.15 (Fig. 1 A). Anterior margin of idiosoma convex (Fig. 1 A). Dorsal furrow incomplete and reaching to end of the posterior margin of the pygal lobes; Dorsal shield W 361, the front part nearly convex; Dorsal humps absent (Figs. 1 A, C). Hyaline petiole tongue-shaped, with small humps lateral to petiole (Fig. 1 A); Hyaline membrane trapezoid. Dorsum with an incomplete dorsal shield including postocularia, D 1 and D 2 (Fig. 1 A). Cx-I and Cx-II extending slightly beyond anterior idiosoma margin; medial margin of Cx-IV twice as long as that of Cx-III (Fig. 1 B). ACG medium L 168; PCG medium L 192; Gb – Cx-IV 276; Gb – Gp 374; Gb – Ep 425 (Fig. 1 B). Suture lines of Cx-I and Cx-II, CxIII and Cx-IV very obvious. Idiosoma posteriorly with a large concavity (Fig. 1 B). Ap approximately wing-shaped, triangular (Fig. 1 B). IV-L with swimming setae; IV-L- 4 without a spur (Fig. 2 D). L of palp segments: P-I 18, P-II 41, P-III 45, P-IV 62, P-V 27; P- 2 with three ventral setae; L of I-L- 1 – 6: 30, 55, 54, 79, 89, 104 (Fig. 2 A); L of II-L- 1 – 6: 37, 70, 68, 87, 100, 121 (Fig. 2 B); L of III-L- 1 – 6: 64, 70, 53, 88, 106, 91 (Fig. 2 C); L of IV-L- 1 – 6: 77, 119, 92, 118, 83, 91 (Fig. 2 D). Female. unknown. Habitat. Inhabits the slow-flow stage of creeks with aquatic plants.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA054A839FF22FECEFAC76C33.taxon	etymology	Etymology. Derived from the Latin word " lingua " (tongue), after the tongue-shaped petiole.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA054A839FF22FECEFAC76C33.taxon	discussion	Remarks. This new species differs from all other species in this subgenus, except Arrenurus (Truncaturus) corpuscularis Jin & Wiles, 1996. However, the new species can be distinguished from A. (T.) corpuscularia in the following points: (1) Ap approximately triangular in the new species, but long-bar shaped in A. (T.) corpuscularis; (2) petiole relatively big (about seven times wider and three times longer) in the new species, but small in A. (T.) corpuscularis; (3) P-II without a patch of setae on the medial surface in the new species, but with a patch of setae in A. (T.) corpuscularis; without dorsal humps in the new species, but with dorsal humps in A. (T.) corpuscularis.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	description	(Figs 3 – 6)	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	materials_examined	Material examined. Holotype male, GUGC, Slide No. JL-AR- 2019072301, Baicheng City, Jilin Province, P. R. China (45 ° 37 ′ 46 ″ N, 122 ° 50 ′ 43 ″ E; alt. 150 m), 23 - VII- 2019, Haitao Li leg .. Paratypes, 8 / 6 / 0, Slide No. JL-AR- 2019072302 – JL-AR- 2019072310 (same data as holotype); Slide No. YN-AR- 2018081110 – YN-AR- 2018081113, Mengla County, Yunnan Province P. R. China (101 ° 06 ′ 28 ″ N, 21 ° 08 ′ 43 ″ E), 11 - VIII- 2018, Zhuhui Ding leg .. 8 / 5 / 0.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	diagnosis	Diagnosis. Petiole widest in the middle and with two hyaline appendages; hyaline membrane small trapezoid.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	description	Description. Male (n = 16; Figures 3 – 4): Idiosoma L 957 (957 – 1027) (including petiole), W 792 (792 – 817), L / W ratio 1.21 (1.21 – 1.26) (Fig. 3 A). Anterior margin of idiosoma slightly concave (Fig. 3 A). Dorsal furrow incomplete, reaching to base of the pygal lobes; anterior margin of dorsal shield convex, dorsal shield W 483 (468 – 491); D 1 to D 4 almost on an oblique line, D 3 and D 4 on humps; dorsal humps well developed, and pointing towards anterior of idiosoma (Fig. 3 A, C). A cuticular structure and a pair of small humps between D 4 and the petiole, and the former V-shaped (Fig. 3 A). Pygal lobes well developed (Fig. 3 A). Petiole well-developed, L 165 (165 – 182), widest in the middle; petiole with two hyaline appendages; hyaline membrane small trapezoid (Fig. 3 A). The posterior margin of the idiosoma with a triangular extension, covering the base of the petiole (Fig. 3 A). Cx-I and Cx-II extending well beyond the anterior margin of the idiosoma; medial margin of Cx-IV twice the length of Cx-III (Fig. 3 B). ACG medium L 264 (259 – 269); PCG medium L 306 (298 – 311); Gb – Cx-IV 457 (449 – 457); Gb – Gp 547 (547 – 594); Gb – Ep 640 (635 – 683); Ap enlarged medially, extending to lateral margins of idiosoma, lateral parts narrower (Fig. 3 B). L of palp segments: P-I 39 (31 – 39), P-II 90 (89 – 99), P-III 73 (72 – 79), P-IV 116 (116 – 121), P-V 55 (53 – 59) (Fig. 3 D); P- 2 without (or: 0 – 4) ventral setae; L of leg segments: L of I-L- 1 – 6: 66 (65 – 68), 138 (139 – 148), 155 (145 – 155), 185 (184 – 187), 176 (176 – 186), 223 (223 – 238) (Fig. 4 A); L of II-L- 1 – 6: 88 (79 – 88), 153 (142 – 160), 169 (156 – 169), 212 (209 – 215), 207 (207 – 222), 266 (254 – 266) (Fig. 4 B); L of III-L- 1 – 6: 104 (104 – 115), 177 (177 – 187), 155 (155 – 167), 215 (194 – 219), 216 (205 – 216), 225 (190 – 225) (Fig. 4 C); L of IV-L- 1 – 6: 161 (153 – 161), 260 (196 – 260), 193 (190 – 207), 270 (240 – 270), 149 (149 – 164), 209 (201 – 218) (Fig. 4 D); IV-l- 4 with a spur. Female (n = 11; Figures 5 – 6): Idiosoma L 1289 (1289 – 1354), W 1165 (1165 – 1198), L / W ratio 1.11 (1.11 – 1.13) (Fig. 5 A); dorsal furrow complete, dorsal shield L 1025 (1013 – 1065), W 865 (856 – 872); Dorsal humps absent (Fig. 5 A). Cx-I and Cx-II not extending beyond anterior margin of idiosoma; Cx-IV almost without a medial margin; ACG medium L 261 (256 – 261); PCG medium L 314 (292 – 314); Gb – Cx-IV 424 (404 – 448); Gb – Gp 487 (485 – 498); Gb – Ep 950 (950 – 973) (Fig. 5 B). Ap slightly bowed (Fig. 5 B). Gp L 147 (147 – 161), W 177 (168 – 185); L of palp segments: P-I 41 (40 – 46), P-II 76 (76 – 102), P-III 84 (74 – 90), P-IV 134 (126 – 134), P-V 51 (44 – 55) (Fig. 5 C), P-II with two (or: 1 – 3) ventral setae; L of leg segments: L of I-L- 1 – 6: 70 (70 – 72), 128 (128 – 134), 137 (137 – 147), 185 (184 – 188), 180 (175 – 184), 182 (182 – 198) (Fig. 6 A); L of II-L- 1 – 6: 72 (72 – 77), 152 (151 – 158), 158 (158 – 163), 213 (197 – 216), 216 (199 – 216), 215 (209 – 215) (Fig. 6 B); L of III-L- 1 – 6: 87 (87 – 93), 154 (154 – 162), 164 (147 – 164), 213 (208 – 216), 210 (202 – 210), 216 (186 – 216) (Fig. 5 C); L of IV-L- 1 – 6: 142 (142 – 154), 212 (199 – 229), 218 (204 – 218), 287 (276 – 287), 229 (229 – 244), 260 (246 – 260) (Fig. 6 D). Habitat. Inhabiting a lentic pool in the stream bed with dead branches and rotten leaves.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	distribution	Distribution. China (Jilin, Yunnan).	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	etymology	Etymology. “ Pseudo- ” means false; the news species is named after its similar species, Arrenurus (Arrenurus) distinctus Marshall, 1919.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA055A83DFF22FE0AFECC6C4A.taxon	discussion	Remarks. The new species is close to Arrenurus (Arrenurus) distinctus Lundblad, (1969). However, the new species differs from A. (A.) distinctus in the following points, particularly in the male: (1) With hyaline membrane in the new species, but without in A. (A.) distinctus; (2) Ligulate process well-developed in the new species, but relatively short in A. (A.) distinctus; (3) Cx-I and Cx-II much extending beyond anterior idiosoma margin in the new species, but not in A. (A.) distinctus. The new species is similar to Arrenurus (Arrenurus) kantakaphorus Cook, 1967 (Cook 1967) collected from India, but they differ from each other by the following: (1) The petiole is shorter (165 – 182) in the new species, but longer (319) in A. (A.) kantakaphorus. (2) petiole with two hyaline appendages in the new species, but with a spoonshaped central piece in A. (A.) kantakaphorus. Also, the new species is similar to Arrenurus (Arrenurus) confinis Lundblad, 1969 (Lundblad 1969). However, the new species differs from A. (A.) confinis in the following points: (1) The petiole has no setae in the new species, but has a pair of setae in A. (A.) confinis. (2) Hyaline membrane small and trapezoid in the new species, but bigger in A. (A.) confinis.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	description	(Figs 7 – 8)	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	materials_examined	Material examined. Holotype male, GUGC, Slide No. JS-AR- 2018072701, Yancheng City, Jiangsu Province, P. R. China (33 ° 37 ′ 76 ″ N, 120 ° 13 ′ 99 ″ E; alt. 5 m), 27 - VII- 2018, Zhuhui Ding leg .. 1 / 0 / 0.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	diagnosis	Diagnosis. Hyaline membrane short and extending to the base of the pygal lobes; pygal lobes well developed, posteriorly almost at the same level as posteror margin of petiole; D 4 on a small hump, flanked by two connected small humps.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	description	Description. Male (n = 1; Figures 7 – 8): Idiosoma L 973 (including petiole), W 718, L / W ratio 1.36 (Fig. 7 A). Anterior margin of idiosoma slightly concave (Fig. 7 A). Dorsal furrow incomplete, dorsal shield W 450; D 1 on small humps (Fig. 7 A). Pygal lobes well developed, posteriorly, almost at the same level as posterior margin of petiole. Hyaline membrane short and extending to the base of the pygal lobes (Fig. 7 A). Petiole L 99, approximately rectangular; ligulate process bottle-shaped, lying anterior to posterior margin of petiole (Fig. 7 A). In lateral view, the dorsal humps small (Fig. 7 C). Cx-I and Cx-II not extending beyond anterior margin of idiosoma; medial margin of Cx-IV twice the length of the medial margin of Cx-III (Fig. 7 B). ACG medium L 218; PCG medium L 234; Gb – Cx-IV 412; Gb – Gp 478; Gb – Ep 619; Ap enlarged at the Gp, extending to lateral margins of idiosoma, lateral parts narrower; Ap with two pairs of genital setae (Fig. 7 B). D 4 on a small hump near the petiole, flanked by two connected small humps (Fig. 7 A). L of palp segments: P-I 25, P-II 60, P-III 49, P-IV 73, P-V 43 (Fig. 7 D), P- 2 with two ventral setae; L of leg segments: L of I-L- 1 – 6: 55, 96, 102, 128, 129, 182 (Fig. 8 A); L of II-L- 1 – 6: 60, 108, 123, 156, 157, 204 (Fig. 8 B); L of III-L- 1 – 6: 90, 134, 121, 164, 164, 184 (Fig. 8 C); L of IV-L- 1 – 6: 116, 181, 183, 263, 101, 144 (Fig. 8 D). Female. unknown. Habitat. streams.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	distribution	Distribution. China (Jiangsu).	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	etymology	Etymology. Named after Yancheng City, where the type specimen was collected.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA051A832FF22FEC5FC516963.taxon	discussion	Remarks. The new species is similar to Arrenurus (Arrenurus) angelieri Cassagne-Méjean, 1966 (Gerecke et al. 2016). However, the new species differs from A. (A.) angelieri in the following points: (1) Hyaline membrane short and extending to the base of the pygal lobes in the new species, but not extending laterally in A. (A.) angelieri; (2) without ligulate process in the new species, but with a short ligulate process in A. (A.) angelieri; (3) Ap extending to lateral margins of idiosoma in the new species, but not extending laterally in A. (A.) angelieri; (4) posterior margin of petiole concave in A. (A.) angelieri, but convex in the new species.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05FA831FF22FF36FD1F6B00.taxon	description	(Figs 9 – 12)	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05FA831FF22FF36FD1F6B00.taxon	materials_examined	Material examined. GUGC, Slides No. JL-AR- 2018042601 – JL-AR- 2018042604, Baicheng City, Jilin Province, P. R. China (45 ° 37 ′ 46 ″ N, 122 ° 50 ′ 43 ″ E; alt. 150 m), 26 - IV- 2018, Zhuhui Ding leg .. 2 / 2 / 0.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05FA831FF22FF36FD1F6B00.taxon	description	Description. Male (n = 2; Figures 9 – 10): Idiosoma L 714 (725) (including petiole), W 588 (574), L / W ratio 1.21 (1.26) (Fig. 9 A). Anterior margin of idiosoma slightly concave (Fig. 9 A). Dorsal furrow incomplete and reaching to the middle of the cauda; the front part of the dorsal shield nearly round, dorsal shield W 387 (376); D 1 and D 4 on small humps (Fig. 9 A). Dorsal humps underdeveloped (Fig. 9 C). Cauda and pygal lobes short; posteriorly with a rounded extension, on which the petiole is located. Petiole lance-shaped, without ligulate process (Fig. 9 A). Cx-I and Cx-II not exceeding anterior margin of idiosoma; medial margin of Cx-IV twice the length of Cx-III (Fig. 9 B). ACG medium L 181 (176); PCG medium L 218 (210); Gb – Cx-IV 314 (299); Gb – Gp 366 (354); Gb – Ep 462 (451); Ap extending to lateral margins of idiosoma (Fig. 9 B). IV-L- 4 without a spur (Fig. 9 D). L of palp segments: P-II 51 (53), P-III 51 (52), P-IV 72 (65), P-V 41 (38) (Fig. 9 D); L of leg segments: L of I-L- 1 – 6: 78 (70), 84 (76), 92 (85), 112 (106), 123 (116), 136 (130) (Fig. 10 A); L of II-L- 1 – 6: 55 (51), 112 (100), 89 (93), 128 (132), 143 (156), 152 (143) (Fig. 10 B); L of III-L- 1 – 6: 64 (57), 124 (131), 91 (80), 135 (127), 144 (135), 129 (135) (Fig. 10 C); L of IV-L- 1 – 6: 91 (85), 149 (152), 117 (107), 159 (163), 163 (167), 168 (174) (Fig. 10 D). Female (n = 2; Figures 11 – 12): Idiosoma L 1064 (1003), W 953 (942), L / W ratio 1.12 (1.06) (Fig. 11 A); dorsal furrow complete, dorsal shield oval, L 840 (831), W 698 (684); D 1 on wide round humps (Fig. 11 A). Medial separation of Cx-IV almost equal in width with Gp (Fig. 11 B). Medial margin of Cx-III shorter than that of Cx-IV; ACG medium L 198 (186); PCG medium L 234 (230); Gb – Cx-IV 343 (329); Gb – Gp 402 (411); Gb – Ep 774 (740) (Fig. 11 B). Ap close to Cx-IV, long, straight or bowed, not extending to lateral margins of idiosoma, same wide along their total length (Fig. 11 B). Genital field longer than wide, Gp without sclerotized patches (Fig. 11 B). L of palp segments: P-I 40 (35), P-II 72 (65), P-III 54 (52), P-IV 77 (72), P-V 42 (45) (Fig. 11 C); L of leg segments: L of I-L- 1 – 6: 55 (51), 111 (104), 92 (93), 128 (134), 134 (128), 136 (134) (Fig. 12 A); L of II-L- 1 – 6: 55 (56), 128 (124), 108 (111), 148 (145), 156 (148), 152 (147) (Fig. 12 B); L of III-L- 1 – 6: 72 (74), 112 (121), 106 (110), 155 (148), 171 (159), 160 (163) (Fig. 12 C); L of IV-L- 1 – 6: 116 (113), 155 (152), 154 (152), 198 (183), 194 (197), 192 (184) (Fig. 12 D). Habitat. Still water.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05FA831FF22FF36FD1F6B00.taxon	distribution	Distribution. China (Jilin); Palaearctic. Whole of Europe (Gerecke et al. 2016).	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05FA831FF22FF36FD1F6B00.taxon	discussion	Remarks. The whole idiosoma features, palp and cauda are almost the same as Arrenurus (Arrenurus) crassicaudatus (Gerecke et al. 2016), except for the medial separation of Cx-IV which is almost equal in width with Gp in the Chinese female specimen, but medial separation of Cx-IV wider than Gp in the European specimen Hence the specimens from Baicheng City, Jilin Province show a general conformity with that from Europe. The species is recorded for the first time for the Chinese fauna.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05DA835FF22F908FCB36BAF.taxon	description	(Figs 13 – 16)	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05DA835FF22F908FCB36BAF.taxon	materials_examined	Material examined. GUGC, Slides No. JL-AR- 2019072301 – JL-AR- 20190723025, Baicheng City, Jilin Province, P. R. China (4537 ′ 46 ″ N, 12250 ′ 43 ″ E; alt. 150 m), 23 - VII- 2019, Haitao Li leg .. 16 / 9 / 0.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05DA835FF22F908FCB36BAF.taxon	description	Description. Male (n = 16; Figures 13 – 14): Idiosoma L 730 (721 – 792), W 426 (426 – 502), L / W ratio 1.71 (1.57 – 1.71) (Fig. 13 A). Anterior margin of idiosoma slightly concave (Fig. 13 A). Dorsal furrow incomplete, W 387 (302 – 387); D 1 on small humps (Fig. 13 A). D 3 and D 4 on well developed humps (Fig. 13 A). Cx-I and Cx-II extending beyond anterior idiosoma margin; medial margin of Cx-IV equal in length with that of Cx-III (Fig. 13 B). ACG medium L 181 (176 – 189); PCG medium L 218 (200 – 227); Gb – Cx-IV 314 (310 – 325); Gb – Gp 366 (354 – 375); Gb – Ep 462 (451 – 474); Ap enlarged at the Gp, extending to lateral margins of idiosoma, lateral parts narrower; Ap with four pairs of genital setae (Fig. 13 B). L of palp segments: P-I 24 (21 – 25), P-II 53 (51 - 55), P-III 39 (39 - 49), P-IV 57 (51 - 58), P-V 24 (24 – 27) (Fig. 13 C); P-II without medial setae. L of leg segments: L of I-L- 1 – 6: 47 (46 – 50), 76 (74 – 80), 94 (86 – 99), 104 (102 – 113), 113 (113 – 121), 155 (153 – 167) (Fig. 14 A); L of II-L- 1 – 6: 48 (47 – 51), 84 (81 – 86), 88 (85 – 96), 119 (104 – 122), 138 (116 – 138), 182 (169 – 184) (Fig. 14 B); L of III-L- 1 – 6: 51 (45 – 54), 94 (84 – 96), 96 (92 – 101), 124 (122 – 130), 140 (126 – 142), 164 (155 – 169) (Fig. 14 C); L of IV-L- 1 – 6: 83 (83 – 87), 125 (122 – 136), 136 (131 – 142), 185 (180 – 203), 125 (116 – 130), 156 (149 – 162) (Fig. 14 D), IV-leg- 4 with a short spur. Female (n = 9; Figures 15 – 16): Idiosoma approximately oval, L 881 (845 – 887), W 756 (734 – 776), L / W ratio 1.17 (1.14 – 1.17) (Fig. 15 A); dorsal furrow complete, L 704 (689 – 716), W 582 (575 – 587); Dorsal humps absent (Fig. 15 A). Cx-I and Cx-II extending beyond anterior margin of idiosoma; medial margin of Cx-IV equal in length with that of Cx-III (Fig. 15 B); ACG medium L 184 (179 – 191), PCG medium L 219 (210 – 222), Gb – Gp: 290 (287 – 298), Gb – Ep: 626 (623 – 654), Gb – Cx-IV: 264 (263 – 278) (Fig. 15 B). Gp L 142 (138 – 149), W 144 (140 – 154) (Fig. 15 B). Ap slightly bowed; Gp with two pairs of triangular sclerotized patches, anterior patch larger than posterior patch (Fig. 15 B). L of palp segments: P-I 24 (23 - 27), P-II 51 (48 - 55), P-III 45 (44 – 49), P-IV 57 (55 – 62), P-V 27 (25 – 30); P-II with two medial setae (Fig. 15 C); L of I-L- 1 – 6: 45 (43 – 51), 91 (81 – 93), 90 (85 – 92), 115 (109 – 119), 116 (112 – 120), 138 (130 – 140) (Fig. 16 A); L of II-L- 1 – 6: 46 (46 – 52), 83 (73 – 85), 90 (90 – 107), 134 (130 – 135), 145 (141 – 147), 148 (142 – 152) (Fig. 16 B); L of III-L- 1 – 6: 59 (57 – 62), 101 (101 – 110), 102 (100 – 108), 134 (130 – 140), 139 (135 – 147), 137 (130 – 141) (Fig. 16 C); L of IV-L- 1 – 6: 81 (79 – 86), 139 (135 – 144), 137 (131 – 139), 179 (175 – 185), 161 (157 – 168), 165 (160 – 171) (Fig. 16 D). Habitat. Still water.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05DA835FF22F908FCB36BAF.taxon	distribution	Distribution. China (Jilin, Heilongjiang, Inner Mongolia); Russia (Sokolow 1931).	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
5E2587BDA05DA835FF22F908FCB36BAF.taxon	discussion	Remarks. This species was collected by Sokolow (1931) from the Ussuri River in the Soviet Union. The specimens from Baicheng City, Jilin Province show a general conformity with that from Russia. The species is firstly recorded for the Chinese fauna. However, the two populations are slightly different in the following (Besseling 1968): (1) The D 3 on humps is very obvious in the Chinese specimen, while the D 3 on humps is very inconspicuous in the original description. The difference observed can be due to geographical variation.	en	Zheng, Yulin, Guo, Jianjun, Zhang, Runzhi (2022): Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China. Zootaxa 5174 (1): 55-72, DOI: https://doi.org/10.11646/zootaxa.5174.1.4
