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Torrenticola siamis Pešić & Smit, 2009 Torrenticola siamis Pešić & Smit, 2009: 35; Gu et al. 2019b: 105. Diagnosis. Cx-II+III mL short; Cx-IV not extended posterior to the genital field; male genital field rectangular, ejaculatory complex conventional in shape; deep capitulum with a short rostrum (Pešić & Smit 2009). Material examined. 1/1/0 (CQ-TO-2022081305, CQ-TO-2022081306), China, Chongqing, Yintiaoling National Nature Reserve, Lanying Grand Canyon (31°26′19′′N, 109°50′46′′E, 870 m a.s.l.), collected by Yuhao Zhang, 13-VIII-2022. Habitat. Streamlet. Remarks. The specimens from Yintiaoling National Nature Reserve show general agreement with the types of T. siamis Pešić & Smit, 2009 (Pešić & Smit 2009; Gu et al. 2019b), with no obvious differences present. Distribution. China (Guizhou (Gu et al. 2019b), Chongqing); Thailand (Pešić & Smit 2009), Published as part of Gu, Xinyao, Zhang, Yuhao, Zheng, Yuling & Guo, Jianjun, 2023, First collection of Torrenticolidae (Hydrachnidiae, Acari) from Yintiaoling National Nature Reserve, China, with descriptions of two new species, pp. 131-142 in Zootaxa 5257 (1) on page 140, DOI: 10.11646/zootaxa.5257.1.10, http://zenodo.org/record/7765695, {"references":["Pesic, V. & Smit, H. (2009) Water mites of the family Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia) from Thailand, Part I. The genera Torrenticola Piersig, 1896, Neoatractides Lundblad, 1941 and Pseudotorrenticola Walter, 1906. Zootaxa, 1982 (1), 38 - 62. https: // doi. org / 10.11646 / zootaxa. 1982.1.2","Gu, X. Y., Jin, D. C., Yi, T. C. & Guo, J. J. (2019 b) Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China. Zootaxa, 4695 (2), 101 - 121. https: // doi. org / 10.11646 / zootaxa. 4695.2.1"]}

Torrenticola nipponica (Enami, 1940) Atractides nipponicus Enami 1940: 221. Torrenticola nipponica: Chung & Kim 1995: 27; Pešić et al. 2013: 30; Gu et al. 2018: 1973. Diagnosis. Idiosoma oval, purple or reddish; antero-medial platelets rectangular oval; P-2 with three to five thick and long setae, one dorsal short-thin seta, and with a ventral prolongation bearing a long seta; P-3 with two or three dorsal setae, and a ventral prolongation bearing a long seta; P-4 with four fine dorsal setae and two ventral prolongations bearing one long and three short setae. Material examined. 1/2/0 (CQ-TO-2022081302— CQ-TO-2022081304), China, Chongqing, Wuxi, Yintiaoling National Nature Reserve, Lanying Grand Canyon (31°26′19′′N, 109°50′46′′E, 870 m a.s.l.), 13-VIII-2022, collected by Yuhao Zhang. Habitat. Streamlet, about 0.3–0.5 m in depth, with many small stones at the bottom. Remarks. Those specimens match the general morphology of T. nipponica, a species from Japan (Enami 1940). And T. nipponica was reported as a newly recorded from China in 2018 (Gu et al. 2018). Those specimens from Chongqing show a general conformity with the populations from Guizhou: C 4 on the same line with the 4 th pair of acetabula in the male, and the 5 th pair in the female; dorsal plate with a colour pattern, hour-glass-shaped with pale“shoulder-patches”. Distribution. China (Guizhou (Gu et al. 2018), Chongqing), Japan (Enami 1940), South Korea (Chung & Kim 1995, Pešić et al. 2013), and Russia (Pešić et al. 2013)., Published as part of Gu, Xinyao, Zhang, Yuhao, Zheng, Yuling & Guo, Jianjun, 2023, First collection of Torrenticolidae (Hydrachnidiae, Acari) from Yintiaoling National Nature Reserve, China, with descriptions of two new species, pp. 131-142 in Zootaxa 5257 (1) on pages 139-140, DOI: 10.11646/zootaxa.5257.1.10, http://zenodo.org/record/7765695, {"references":["Enami, M. (1940) Water mites from Izu. I. Rheophilous water mites from river Inozawa. To hoku Daigaku. Science reports of Tohoku University (Series 4, Biology), 15, 203 - 259.","Chung, K. S. & Kim, I. H. (1995) Water Mites from Chindo Island. The Korean Journal of Systematic Zoology, 11, 27 - 37.","Pesic, V., Chatterje, T., Das, M. K. & Bordoloi, S. (2013) A new species of water mite (Acari, Hydrachnidia) from Assam, India, found in the gut contents of the fifish Botia dario (Botiidae). Zootaxa, 3746 (3), 454 - 462. https: // doi. org / 10.11646 / zootaxa. 3746.3.4","Gu, X. Y., Jin, D. C., Yi, T. C. & Guo, J. J. (2018) Chinese water mites of the genus Torrenticola Piersig, 1896 (Acari, Hydrachnidia, Torrenticolidae), with descriptions of two new species and a new record from Foding Mountain. Systematic & Applied Acarology, 23 (10), 1972 - 1985. https: // doi. org / 10.11158 / saa. 23.10.9"]}

Torrenticola pseudoalargada Gu & Guo sp. nov. (Figures 5–8) Type Materials. Holotype male: No. CQ-TO-2022081301, China, Chongqing, Wuxi, Yintiaoling National Nature Reserve, Lanying Grand Canyon (31°26′19′′N, 109°50′46′′E, 870 m a.s.l.), collected by Yuhao Zhang, 13-VIII- 2022. Paratypes: 1/3/0, No. CQ-TO-2022081106 – CQ-TO-2022081109, Yintiaoling National Nature Reserve, Linkouzi (31°28′35′′N, 109°53′18′′E, 1250 m a.s.l.), collected by Yuhao Zhang, 11-VIII-2022. Diagnosis. Dorsal plate arrangement: 4+1; Infracapitular bay U-shaped; P-2 with four dorsal setae, and one ventral seta at the base of a serrated extension; P-3 with one serrated rectangular extension on ventrum, at the base of which with one ventral seta; P-4 with two dorsal setae, and two setae on two ventral extensions. Description. Male (n = 2): Idiosoma elliptical, L 690 (813), W 438 (538), L/W ratio 1.6 (1.5). Dorsal plate arrangement: 4+1 (Fig. 5A); dorsal shied L 558 (626), W 391 (467), dorsal plate L 526 (571), frontal platelets L 118 (129), W 53 (65), L/W ratio 2.2 (2.0); shoulder platelets L 169 (202), W 61 (85), L/W ratio 2.8 (2.4). Infracapitular bay U-shaped, L 131 (156); Cx-I L 256 (300), mL 126 (144), Cx-II+III mL 78 (112); genital field ellipse, L 152 (185), W 106 (140); C 4 at the same level as the 4 th pair of acetabula; the posterior margin of Cx-IV relatively indistinct; V 1 anterior to V 2 , V 2 almost at the same level of Ap (Fig. 5B). Gnathosoma: dL 206 (266), vL 281 (350); rostrum long and dorsal apodeme short, ventral apodeme long and blunt; chelicera bs L 281 (356), claw L 41 (47), (Fig. 5D). Palp (Fig. 5C): P-1 short, with one dorsodistal seta; P-2 with four dorsal setae, and one ventral seta at the base of a serrated extension; P-3 with two dorsal setae and one serrated rectangular extension on ventrum, at the base of which with one ventral seta; P-4 with two dorsal setae, and two ventral setae on two ventral extensions. L of palp segments: P-1, 30 (39); P-2, 85 (105); P-3, 52 (55); P-4, 63 (70); P-5, 15 (19). Legs (Fig. 6): L of leg segments: I-L-1–6: 33 (36), 78 (84), 66 (72), 70 (88), 79 (97), 80 (91); II-L-1–6: 31 (36), 77 (89), 57 (69), 79 (83), 87 (99), 94 (101); III-L-1–6: 45 (42), 78 (94), 65 (72), 90 (101), 106 (118), 108 (117); IV-L-1–6: 89 (98), 87 (104), 95 (116), 124 (133), 136 (137), 123 (131). Ejaculatory complex (Fig. 5E), L 156 (-), aL 118 (-). Female (n = 3). Body features same as the male except: genital field pentagonal; C 4 at the same level as the 4 th pair of acetabula; the posterior margin of Cx-IV relatively obvious (Fig. 7B); P-3 with three dorsal setae (Fig. 7C). Idiosoma L 937 (771–937), W 627 (502–627), L/W ratio 1.49 (1.49–1.54). Dorsal shield L 738 (621–738), W 556 (453–556), L/W ratio 1.3 (1.3–1.4); dorsal plate L 675 (568–675), frontal platelets L 178 (130–178), W 71 (57–71), L/W ratio 2.5 (2.3–2.5), shoulder platelets L 218 (171–218), W 90 (60–90). Infracapitular bay depth 174 (153–174); Cx-I L 348 (293–348), mL 171 (142–171), Cx-II + III mL 76 (48–76). Genital field L 191 (161–191), W 178 (134–178), L/W ratio 1.1 (1.1–1.2); distance between genital field and Ap 202 (177–202). Gnathosoma vL 412 (308–412), dL 309 (231–309), chelicera bs L 433 (330–433), claw L 53 (51–53). L of palp: P-1, 43 (34–43); P-2, 125 (95–125); P-3, 66 (55–66); P-4, 81 (66–81); P-5, 13 (13–17). L of leg segments: I-L-1–6: 43 (30–43), 100 (85–100), 85 (70–85), 94 (76–94), 112 (81–112), 101 (81–101); II-L-1–6: 40 (34–40), 96 (85–96), 79 (64–79), 99 (83–99), 114 (88–114), 112 (99–112); III-L-1–6: 40 (35–40), 108 (83–108), 85 (69–85), 122 (98–122), 139 (115– 139), 129 (122–129); IV-L-1–6: 120 (101–120), 102 (102–118), 122 (113–122), 157 (132–157), 159 (143–159), 144 (139–144). Habitat. Streamlet, about 0.3–0.5 m in depth, is so clear that you can see many small stones at the bottom. Remarks. The present species is similar to T. alargada Goldschmidt, 2007, a species from Latin American (Goldschmidt 2007). Both species have a serrated ventral extension on P-2, two setae-bearing projections on ventral margin of P4, and a similar gnathosoma. The new species differs from T. alargada in: (1) T. pseudoalargada Gu & Guo sp. nov. with a U-shaped infracapitular bay, but V-shaped in T. alargada; (2) T. pseudoalargada Gu & Guo sp. nov. without color pattern, but posterior two-thirds of dorsal plate red to pale reddish in T. alargada; (3) P-4 with two ventral setae in T. pseudoalargada Gu & Guo sp. nov., but with four ventral setae in T. alargada. In addition, the new species resembles T. malaisei (Lundblad, 1941) (Wiles 1997; Pešić et al. 2012) in: P-3 with a short, subrectangular, apically serrated ventrodistal projection, and a long seta laterally at the base of the projection and a comparatively short P-4. But two species have obvious differences in: (1) P-2 with a flat blade-like ventral extension in T. malaisei but with a serrated extension in T. pseudoalargada; (2) posterior suture line of Cx-IV obvious and long in T. malaisei but retrogressive in T. pseudoalargada; (3) Cx-I –II exceeding to the anterior margin of idiosoma in T. malaisei, but only Cx-I and Cx-II exceeding to it in T. pseudoalargada. Etymology. This species is named after its similar species, T. alargada. And the specific name, pseudoalargada, is from the Latin affix: “ pseudo -”, which means fake or simulated; used as a noun in apposition. Distribution. Known only on the type locality (Wuxi, Chongqing of China)., Published as part of Gu, Xinyao, Zhang, Yuhao, Zheng, Yuling & Guo, Jianjun, 2023, First collection of Torrenticolidae (Hydrachnidiae, Acari) from Yintiaoling National Nature Reserve, China, with descriptions of two new species, pp. 131-142 in Zootaxa 5257 (1) on pages 136-138, DOI: 10.11646/zootaxa.5257.1.10, http://zenodo.org/record/7765695, {"references":["Goldschmidt, T. (2007) Studies on Latin American water mites of the genus Torrenticola Piersig, 1896 (Torrenticolidae, Hydrachnidia, Acari). Zoological Journal of the Linnean Society, 150, 443 - 678. https: // doi. org / 10.1111 / j. 1096 - 3642.2007.00305. x","Wiles, P. R. (1997) Asian and Oriental Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia: Lebertioidea): a revision of the family and description of new species of Torrenticola Piersig and Pseudotorrenticola Walter, from Southeast Asia. Journal of Natural History, 31, 191 - 236. https: // doi. org / 10.1080 / 00222939700770121","Pesic, V. Chatterjee, T., Kumar D. M. & Bordoloi S. (2012) Two rare water mite species (Acari, Hydrachnidia) from the streams of the Indian eastern Himalayan region. Systematic & Applied Acarology, 17 (4), 458 - 464. https: // doi. org / 10.11158 / saa. 17.4.15"]}

Gu, Xinyao, Xiao, Haichuan, Jin, Daochao, Guo, Jianjun (2022): Integrative approach of morphology and geometric morphometrics to species delimiation in Torrenticolidae (Acari: Hydrachnidiae). Zoological Systematics 47 (2): 117-131, DOI: 10.11865/zs.2022203, URL: http://zoobank.org/95bc1f6b-ea40-4831-8db1-4b4ee6e917d5

Arrenurus (Arrenurus) ancoralis Zheng & Guo sp. nov. (Figs. 1–3) 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. 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. 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. 1B). 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. 1C). ACG medium L 156; Gb–Cx-IV, 532; Gb–Gp, 593; Gb–Ep, 845; Cx-IV posterior angles undeveloped (Fig. 1A). Inverted T-shaped cuticular structure between the glands of D 4 undeveloped, only with horizontal ridge (Fig. 1D); Ap evenly extending from Gp to the sides of the body (Fig. 1A, 1C). 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. 1E). L of I-L-1–6: 52, 124, 133, 164, 152, 179 (Fig. 2A). 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. 2B), III-L-4 9, III-L-5 7; IV-L-3 14 (Fig. 2C), IV-L-4 16 (including five short swimming setae on the spur), IV-L-5 9 (Fig. 2D). 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. 3B 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. 3A); L 137 and W 152; (Fig. 3A). 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. 3D). L of I-L-1–6: 52, 113, 156, 179, 167, 171 (Fig. 3E). 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. 3F). Habitat. Pool in the stream bed with dead branches and rotten leaves. Etymology. Derived from the Latin word “ancorale” (anchor). In this new species, D 3 gland protrusion looks like an anchor. 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 D4 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.

Arrenurus (Truncaturus) isikliensis Boyaci & Özkan, 2004 (Figs. 8A – F) 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, 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. 8B). D 4 on wide round humps (Fig. 8C). 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. 8A). Gb approximately “U” shaped, ACG medium L 114, Gb–Cx-IV, 214; Gb–Gp, 33; Gb–Ep, 578 (Fig. 8A). 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. 8D). L of I-L-1–6: 45, 83, 84, 120, 132, 132 (Fig. 8E); 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. 8F). Habitat. Rivers. 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.

Genus Monatractides (K. Viets, 1926) Diagnosis: see Wiles 1997: 202.

Three torrenticolid species new to science, i.e. Monatractides trilaminatus sp. nov., Torrenticola lushanensis sp. nov., and T. planusirostrum sp. nov. are described from Jiangxi Province, P. R. China. M. trilaminatus sp. nov. can be distinguished by the shoulder and frontal platelets fused together and formed into a pair of platelets; infracapitular bay U-shaped, extremely deep and narrow; the tip of coxae I with a small rectangle extension. T. lushanensis sp. nov. can be distinguished by epimeroglandularia 4 at the same level as the 4th pair of acetabula; anal pore on the same line with ventroglandularia 2, and posterior to ventroglandularia 1. T. planusirostrum sp. nov. can be distinguished by infracapitular dorsal apodeme almost absent, ventral apodeme blunt and long, rostrum flat and parallel to the ventral apodeme. Detailed descriptions and illustrations of these species are given in this paper., Acarologia, 60, 488-500

Torrenticola changbaiensis sp. nov. (Figs. 7���8) Material examined. Holotype male, No. JL-TO-20190706, Changbaishan National Nature Reserve KH��Oi��� ��Ŋ ������������), Jilin Province, P. R. China (42��24���19������N, 128��17���38������E, 721 m a.s.l.), collected by Zhuhui Ding and Caiyun Li, 30-VII-2019. Paratype: 3/0/0, No. JL-TO-20190707 ��� JL-TO-20190709, same data as holotype. Diagnosis. Dorsal plate arrangement: 2+2p+1 (Fig.7A); E 4 on the same line with the 3 rd pair of acetabula; infracapitular bay U-shaped; V 1 anterior to V 2 , V 2 almost at the same level of Ap; P-4 with one small dorsal seta and two developed ventral extensions, with one long and one short setae on each. Description. Male (n = 4): Idiosoma elliptical(Fig. 7B), L 666 (649���675), W 459 (459���505), L/W ratio1.5 (1.3���1.5). Dorsal plate arrangement: 2+2p+1 (Fig. 7A), dorsal shied L 544 (519���563), W 422 (403���432), dorsal plate L 504 (483���512), frontal platelets L 132 (132���153), W 57 (47���57), shoulder platelets W 68 (46���69). Infraca- pitular bay U-shaped, L 142 (137���142); Cx-I L 255 (247���258), mL 115 (111���117), Cx-II+III mL 95 (94���101); Gf L 168 (155���168), W 128 (117���129), E 4 on the same line with the 3 rd pair of acetabula;distance between Gf and Ap 97 (88���97); V 1 anterior to V 2 , V 2 almost at the same level of Ap (Fig.7B). Gnathosoma dL 206 (205���212), vL 275 (258���275); rostrum short (Female. Unknown. Habitat. River, about 8 m wide, 1 m depth; water is cold and torrential. The river is about 15 m away from the highway. Remarks. The new species is characterized by dorsal plate arrangement 2+2p+1; E 4 on the same line with the 3 rd pair of acetabula; P-4 with two developed ventral extensions; dorsal apodeme short, ventral apodeme slender and craved to dorsum. This species can be easily distinguished from other species by those characteristics. Etymology. This new species is named after the place (Changbai Mountain), where the new species was collected. Distribution. China (Jilin)., Published as part of Gu, Xinyao, Jia, Lan, Jin, Daochao & Guo, Jianjun, 2020, Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China, pp. 245-259 in Zootaxa 4779 (2) on pages 253-255, DOI: 10.11646/zootaxa.4779.2.6, http://zenodo.org/record/3833531

Torrenticola acrisarostrum sp. nov. (Figs. 9���10) Material examined. Holotype male, No. JL-TO-20190710, Songhuajiangsanhu National Nature Reserve (LJAE ���ĀOiDZğ��Ŋ ������������), Jilin Province, P. R. China (42��32���34������N, 127��38���12������E, 713 m a.s.l.), collected by Zhuhui Ding and Caiyun Li, 30-VII-2019. Paratype: 1/0/0, No. JL-TO-20190711, same data as holotype. Diagnosis. Dorsal plate arrangement: 2+2p+1; E 4 on the same line with the 2 nd pair of acetabula; gnathosoma rostrum tapering and sharp, dorsal apodeme short, ventral apodeme long; P-2 wide, with four dorsal setae and one ventral seta on the ventral extension. Description. Male (n = 2): Idiosoma elliptical, L 616 (611), W 415 (424), L/W ratio 1.5 (1.4). Dorsal plate arrangement: 2+2p+1 (Fig. 9A), dorsal shied L 492 (504), W 352 (378), dorsal plate L 452 (474), frontal platelets L 115 (115), W 43 (39), shoulder platelets W 60 (49). Infracapitular bay U-shaped, L 129 (132); Cx-I L 230 (238), mL 102 (108), Cx-II+III mL 106 (96); Gf L 154 (156), W 117 (131); E 4 on the same line with the 2 nd pair of acetabula; Ap slightly posterior to V 2 ; distance between Gf and Ap 82 (79). Gnathosoma dL 200 (193), vL 262 (247); rostrum tapering and sharp, dorsal apodeme short, ventral apodeme long; chelicera bs L 265 (271), claw L 26 (28).Palp (Fig. 9C): P-1 short, with one dorsodistal seta; P-2 wide, with four dorsal setae and one ventral seta on the ventral extension; P-3 with three dorsal setae, and one long ventral seta on the ventral prolongation; P-4 with one dorsal seta and two small dorsodistal setae, one ventral extension, on which with one long and two short setae. L of palp segments: P-1, 37 (24); P-2, 85 (83); P-3, 52 (48); P-4, 84 (78); P-5, 19 (15). Legs (Fig. 10 A���E): L of leg segments: I-L-1���6: 44 (57), 81 (80), 80 (68), 91 (82), 94 (93), 84 (89); II-L-1���6: 39 (41), 77 (82), 69 (66), 81 (84), 101 (98), 103 (106); III-L-1���6: 41 (-), 88 (87), 79 (71), 105 (99), 121 (119), 121 (128); IV-L-1���6: 101 (88), 111 (85), 112 (106), 137 (129), 147 (150), 142 (149). Ejaculatory complex (Fig. 10F) L 183 (188), aL 135 (139). Female. Unknown. Habitat. Streamlet, about 4 m wide, 0.3���0.5 m depth, with many small stones at the bottom and opulent sunlight; water is cold. Remarks. The present species is similar to T. semicolor K.O. Viets, 1977, in having elongated-oval dorsal shield, a short and compact P-3; elongated Cx-I, rounded tips; and a slender rostrum (K.O. Viets, 1977; Goldschmidt 2007). The new species differs from T. semicolor in several characters: (1) Ap away from the line of primary sclero- tization in this new species, but fused together in T. semicolor; (2) E 4 on the same line with the 2 nd pair of acetabula in this new species, but with the 4 th one in T. semicolor; (3) dorsal plate arrangement 2+2p+ 1 in this new species, but 4+ 1 in T. semicolor. Etymology. The specific name is from Latin words: ��� acris ��� which means sharp and ��� rostrum ���, referring to the rostrum tapering and sharp; used as a noun in apposition. Distribution. China (Jilin)., Published as part of Gu, Xinyao, Jia, Lan, Jin, Daochao & Guo, Jianjun, 2020, Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China, pp. 245-259 in Zootaxa 4779 (2) on pages 255-256, DOI: 10.11646/zootaxa.4779.2.6, http://zenodo.org/record/3833531, {"references":["Goldschmidt, T. (2007) Studies on Latin American water mites of the genus Torrenticola Piersig, 1896 (Torrenticolidae, Hydrachnidia, Acari). Zoological Journal of the Linnean Society, 150, 443 - 678. https: // doi. org / 10.1111 / j. 1096 - 3642.2007.00305. x"]}

Torrenticola triextensio sp. nov. (Figs. 1���4) Material examined. Holotype male, No. JL-TO-20190701, Songhuajiangsanhu National Nature Reserve (LJAE ���ĀOiDZğ��Ŋ ������������), Jilin Province, P. R. China (42��22���54������N, 127��9���36������E, 617 m a.s.l.), collected by Zhuhui Ding and Caiyun Li, 29-VII-2019. Paratype: 1/1/0, No. JL-TO-20190702, JL-TO-20190703, same data as holotype. Diagnosis. Dorsal plate arrangement: 2+2p+1; infracapitular bay U-shaped; V 1 anterior to V 2 , V 2 almost at the same level of Ap; P-4 with three ventral extensions, with one long setae on each; rostrum short (Description. Male (n = 2): Idiosoma elliptical, L 748 (764), W 503 (506), L/W ratio 1.5 (1.5). Dorsal plate arrangement: 2+2p+1 (Fig. 1A); dorsal shied L 617 (630), W 466 (467), dorsal plate L 589 (593), frontal platelets L 137 (135), W 51 (48), shoulder platelets W 79 (63). Infracapitular bay U-shaped, L 145 (148); Cx-I L 286 (269), mL 116 (124), Cx-II+III mL 96 (95); Gf L 172 (172), W 123 (122); E 4 at the same level as the 4 th pair of acetabula; V 1 anterior to V 2 , V 2 almost at the same level of Ap (Fig. 1B). Gnathosoma: dL 236 (256), vL 303 (301); rostrum and dorsal apodeme short, ventral apodeme slender; chelicera bs L 337 (338), claw L 40 (36), (Fig. 1D). Palp (Fig. 1C): P-1 long, with one dorsodistal seta; P-2 with three dorsal setae, and one ventral seta at the base of ventral projection; P-3 with two short and one long dorsal setae, and one ventral seta at the base of ventral projection; P-4 with three dorsal setae and three ventral extensions, with one long setae on each. L of palp segments: P-1, 48 (41); P-2, 103 (102); P-3, 67 (55); P-4, 85 (81); P-5, 17 (16). Legs (Fig. 2 A���E): L of leg segments: I-L-1���6: 49 (54), 95 (98), 85 (84), 100 (103), 109 (108), 105 (116); II-L-1���6: 51 (57), 96 (83), 81 (81), 101 (98), 115 (118), 139 (136); III-L-1���6: 70 (72), 85 (73), 88 (88), 117 (114), 127 (136), 156 (157); IV-L-1���6: 116 (115), 123 (95), 120 (119), 154 (157), 183 (180), 169 (172). Ejaculatory complex (Fig. 2F), L 218 (223), aL 163 (167). Female (n = 1). Body features same as the male except: E 4 at the same level as the 5 th pair of acetabulaand P-3 with three short dorsal setae. Idiosoma L 870, W 587, L/W ratio 1.5 (Fig. 3B). Dorsal shied L 718, W 535, dorsal plate L 661, frontal platelets L 143, W 61, shoulder platelets W 48. Infracapitular bay L 181; Cx-I L 327, mL 143, Cx-II+III mL 60; Gf L 183, W 159; distance between Gf and Ap 205. Gnathosoma dL 254, vL 345; chelicera bs L 387, claw L 41. L of palp segments: P-1, 43; P-2, 112; P-3, 65; P-4, 97; P-5, 17. Legs (Fig. 4): L of leg segments: I-L-1���6: 71, 102, 89, 105, 110, 98; II-L-1���6: 60, 107, 83, 116, 129, 145; III-L-1���6: 73, 110, 94, 131, 161, 169; IV- L-1���6: 123, 121, 133, 170, 203, 199. Habitat. Streamlet, about 8 m wide, 0.3���0.5 m depth, with many small stones at the bottom; water is cold. Remarks. Due to the shape of infracapitulum, chelicera, and P-4 stocky and relatively shorter, Torrenticola triextensio sp. nov. closely resembles T. taiwanicus Pe��ić, Semenchenko, Chatterjee, Yam, Chan, 2011 (Pe��ić et al. 2011). The new species differs from T. taiwanicus, in: (1) P-4 with three extensions in this new species, but without in T. taiwanicus; (2) P-3 distal margin without denticles in this new species, but with denticles in T. taiwanicus; (3) dorsal plate arrangement 2+2p+ 1 in this new species, but 2+ 1 in T. taiwanicus. Etymology. The specific name, triextensio, is from Latin words: ��� triplex ��� (we used tri -) and ��� extensio ���, referring to this species has three ventral extensions on P-4; used as a noun in apposition. Distribution. China (Jilin)., Published as part of Gu, Xinyao, Jia, Lan, Jin, Daochao & Guo, Jianjun, 2020, Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China, pp. 245-259 in Zootaxa 4779 (2) on pages 246-247, DOI: 10.11646/zootaxa.4779.2.6, http://zenodo.org/record/3833531, {"references":["Pesic, V., Semenchenko, K. A., Chatterjee, T., Yam, R. S. & Chan, B. K. (2011) New records of water mites of the family Torrenti- colidae (Acari, Hydrachnidia) with descriptions of two new species from Nanshih River system in Taiwan and redescription of Torrenticola ussuriensis (Sokolow, 1940) from the Russian Far East. ZooKeys, 116, 1 - 14. https: // doi. org / 10.3897 / zookeys. 116.1253"]}

Gu, Xinyao, Jia, Lan, Jin, Daochao, Guo, Jianjun (2020): Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China. Zootaxa 4779 (2): 245-259, DOI: https://doi.org/10.11646/zootaxa.4779.2.6

Torrenticola songhuaensis sp. nov. (Figs. 5���6) Material examined. Holotype female, No. JL-TO-20190704, Songhuajiangsanhu National Nature Reserve (LJAE ���ĀOiDZğ��Ŋ ������������), Jilin Province, P. R. China (42��32���34������N, 127��38���12������E, 713 m a.s.l.), collected by Zhuhui Ding and Caiyun Li, 30-VII-2019. Paratype: 0/1/0, No. JL-TO-20190705, same data as holotype. Diagnosis. Dorsal plate arrangement: 2+2p+1; E 4 on the same line with the 6 th pair of acetabula; V 1 anterior to V 2 , Ap between V 2 and V 1 ; the posterior margin of gnathosoma straight; rostrum short and straight, dorsal apodeme short, ventral apodeme long and sharp. Description. Female (n = 2): Idiosoma elliptical, L 774 (730), W 556 (519), L/W ratio 1.4 (1.4). Dorsal plate arrangement: 2+2p+1 (Fig. 5A), the posterior half of the dorsal plate reddish; dorsal shied L 639 (614), W 484 (461), dorsal plate L 593 (566), frontal platelets L 138 (132), W 63 (58), shoulder platelets W 73 (45). Infracapitular bay U-shaped, L 163 (156); Cx-I L 270 (268), mL 106 (110), Cx-II+III mL 61 (45); Gf L 176 (159), W 158 (145); E 4 on the same line with the 6 th pair of acetabula; V 1 anterior to V 2 , Ap between V 2 and V 1 ; distance between Gf and Ap 170 (178). Gnathosoma: dL 214 (212), vL 299 (281), posterior margin straight; rostrum short and straight, dorsal apodeme short, ventral apodeme long and sharp; chelicera bs L 329 (305), claw L 33 (35) (Fig. 5D). Palp (Fig. 5C): P-1 short, with one long dorsodistal seta; P-2 long and wide, with three dorsal setae and one ventral extension, one short seta laterally at the base of the extension; P-3 with one long dorsal seta, and one short seta on the ventral prolongation; P-4 with one short dorsal seta and one small ventral extension, on which with one long and two short setae. L of palp segments: P-1, 35 (32); P-2, 96 (98); P-3, 59 (54); P-4, 95 (87); P-5, 20 (18). Legs (Fig. 6): L of leg segments: I-L-1���6: 49 (41), 83 (85), 78 (72), 93 (81), 105 (96), 89 (98); II-L-1���6:, 50 (55), 97 (87), 72 (67), 93 (88), 114 (106), 98 (114); III-L-1���6: 55 (-), 96 (98), 83 (79), 115 (109), 129 (125), 137 (131); IV-L-1���6: 99 (106), 124 (95), 121 (109), 144 (139), 155 (142), 164 (130). Male. Unknown. Habitat. Streamlet, about 4 m wide, 0.3���0.5 m depth, with many small stones at the bottom and opulent sunlight; water is cold. Remarks. This new species is distinguished by the straight posterior margin of gnathosoma. Due to this characters, this new species resembles Torrenticola bomiensis Cook, 1966 (Pe��ić & Smit 2014). The new species differs from T. bomiensis in: (1) the posterior half of the dorsal plate reddish in this new species, but without obvious color on the dorsal palte in T. bomiensis; (2) dorsal plate arrangement 2+2p+ 1 in this new species, but 4+ 1 in T. bomiensis; (3) the extension of P-2, 3 sharp and smooth in this new species, but blunt and serrated in T. bomiensis. In addition, Torrenticola songhuaensis is similar to Torrenticola triextensio in the shape of dorsal plate and gnathosoma. But two species have obvious differences in: (1) P-4 with three ventral extensions in T. triextensio, and with two in T. songhuaensis; (2) T. triextensio is with no obvious color on the dorsal palte, but the posterior half of the dorsal plate reddish in T. songhuaensis; (3) the posterior margin of gnathosoma pitched in T. triextensio, straight (perpendicular to ventral apodeme) in T. songhuaensis; (4) the ventral extensions of P-2, 3 in T. triextensio is stouter than T. songhuaensis. Etymology. This new species is named after the place (Songhua River), where the new species was collected. Distribution. China (Jilin)., Published as part of Gu, Xinyao, Jia, Lan, Jin, Daochao & Guo, Jianjun, 2020, Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China, pp. 245-259 in Zootaxa 4779 (2) on pages 250-253, DOI: 10.11646/zootaxa.4779.2.6, http://zenodo.org/record/3833531, {"references":["Pesic, V. & Smit, H. (2014) Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Ghana. Zootaxa, 3820 (1), 1 - 80. https: // doi. org / 10.11646 / zootaxa. 3820.1.1"]}

Torrenticola trigona Gu & Guo, sp. nov. (Figs. 6���9) Material examined. Holotype male, No. GZ-TO-20161011, Doupengshan, Guizhou Province, China (26��22���18������N, 107��21���53������E, 1038 m a.s.l.), stream, collected by Xinyao Gu, 2. X.2016. Paratypes, 7/4/0, No. GZ-TO-20161012��� GZ-TO-20161022, same data as holotype. Diagnosis. Idiosoma elliptical; infracapitular bay U-shaped; only the tips of Cx-I and Cx-II exceeding the anterior margin of idiosoma; Ap slightly away from the line of primary sclerotization and anterior to V 2 , at the same line with V 1 ; the lateral view of infracapitulum regular triangle-like. Description. Male (n = 8): Idiosoma elliptical, L/W ratio 1.4 (1.3���1.4). Dorsal plate (4+1), frontal platelets L/W ratio 1.8 (1.7���2.2), shoulder platelets L/W ratio 2.0 (2.0���2.4) (Fig. 6A). Infracapitular bay U-shaped; only the tips of Cx-I and Cx-II exceeding the anterior margin of idiosoma; Gf elongated-oval, L/W ratio 1.4 (1.4���1.5), genital flaps with 15 pairs of setae at the margins; E 4 at the same level as the 5 th pair of acetabula; Ap away from the line of primary sclerotization and anterior to V 2 , at the same line with V 1 . P-1 short, with one dorsodistal seta; P-2 with three dorsal setae, and a ventral seta on the ventrodistal prolongation; P-3 with two setae on dorsum and one ventrodistal seta on the ventrodistal prolongation; P-4 with three dorsal setae, a long and three short setae on two ventral protrusions, two fine setae and one heavy mediodistal seta (Fig. 6D). The lateral view of infracapitulum regular triangle-like, dorsal apodeme serrated (Fig. 6E). Measurements. Idiosoma L 783 (687���837), W 573 (525���627). Dorsal shield L 700 (610���760), W 507 (485��� 560), dorsal plate L 588 (557���680), frontal platelets L 163 (165���167), W 93 (76���98), shoulder platelets L 184 (178���217), W 91 (88���91). Infracapitular bay L 137 (137���163); Cx-1 L 244 (244���273), mL 106 (106���132), Cx-II +III mL 86 (60���90); Gf L 183 (163-197), W 127 (111���133), distance between Gf and Ap 148 (138���148). Gnathosoma vL 208 (204���222), dL 173 (143���173), chelicera bs L 191 (174���206), claw L 55 (55���59). Ejaculatory complex (Fig. 6C), L 226 (201���249), aL 160 (145���180). L of palp: P-1, 30 (27���30); P-2, 61 (61���70); P-3, 48 (42���48); P-4, 73 (73���75); P-5, 26 (22���26). L of leg segments: I-L-1���6: 40 (40���56), 105 (92���105), 105 (90���105), 129 (110���129), 137 (135���137), 125 (120���130); II-L-1���6: 44 (40���44), 99 (80���99), 100 (93���100), 123 (113���125), 140 (130���140), 144 (113���144); III-L-1���6: 47���63, 115 (63���115), 89 (82���92), 132 (98���138), 150 (137���152); IV-L-1���6: 123 (118���127), 126 (126���150), 128 (113���128), 176 (176���183), 192 (177���192), 176 (160���176). Female (n = 4): Body features same as the male except: Idiosoma L/W ratio 1.3 (1.2���1.3); frontal platelets L/W ratio 1.8 (1.8���1.9), shoulder platelets L/W ratio 2.0 (2.0���2.6), Gf pentagonal, L/W ratio 1.3 (1.2���1.4), Ap away from the line of primary sclerotization, at the same line with V 1 and V 2 (Fig. 8B). Measurements. Idiosoma L 820 (720���823), W 650 (590���650). Dorsal shield L 760 (670���760), W 602 (548��� 602), dorsal plate L 687 (592���687), frontal platelets L 177 (172���177), W 97 (90���97), shoulder platelets L 203 (202���204), W 100 (77���100). Infracapitular bay L 173 (171���173); Cx-1 L 310 (291���310), mL 137 (120���137), Cx-II +III mL 47 (28���47); Gf L 230 (216���232), W 172 (171���173), distance between Gf and Ap 210 (189���210). Gnathosoma vL 240 (227���242), dL 168 (165���168), chelicera bs L 231 (208���233), claw L 114 (69���121). L of palp: P-1, 31 (29���32); P-2, 78 (72���78); P-3, 62 (47���62); P-4, 76 (73���77); P-5, 28 (27���28). L of leg segments: I-L-1���6: 44 (40���45), 112 (108���113), 109 (96���109), 136 (133���136), 150 (146���152), 143 (134���143); II-L-1���6: 51 (50���52), 110 (106���110), 108 (97���110), 137 (135���137), 151 (150���151), 140 (136���140); III-L-1���6: 61 (60���62), 119 (103���119), 98 (96���98), 141 (133���142), 161 (153���163), 163 (152���165); IV-L-1���6: 129 (111���131), 158 (135���160), 148 (146���149), 200 (199���201), 208 (208���209), 192 (183���194). Habitat. Stream about 20 centimeters depth, 5 meters wide, located between the mountains and a farmland; with mayflies and leeches as associated fauna. Remarks. This new species is similar to T. siamis. Compared with T. siamis, we can see: (1) the location of V 4 which is close to the posterior line of Gf, while in T. siamis it is close to the posterior of idiosoma; (2) gnathosoma dorsal apodeme serrated in the new species, but smooth in T. siamis; (3) the lateral view of infracapitulum regular triangle-like in T. trigona, but acute triangle-like in T. siamis. Etymology. Named after the characters of the shape of gnathosoma, ���trigon-��� means triangular. Distribution. China (Doupengshan)., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on pages 109-113, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206

Gu, Xinyao, Jin, Daochao, Yi, Tianci, Guo, Jianjun (2019): Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China. Zootaxa 4695 (2): 101-121, DOI: https://doi.org/10.11646/zootaxa.4695.2.1

Torrenticola siamis Pe��ić & Smit, 2009 (Figs. 3���5) Material examined. Doupengshan, Guizhou Province, China (26��22���18������N, 107��21���53������E, 1038 m a.s.l.), stream, collected by Xinyao Gu, 2. X.2016, 1/0/1, No. GZ-TO-20161009���GZ-TO-20161010. Description. Male (n = 1): Idiosoma roundish, L/W ratio 1.3 (Fig. 3A). Dorsal plate (4+1), frontal platelets nearly trapezoid, L/W ratio 1.9, shoulder platelets like an irregular rectangle, L/W ratio 2.0 (Fig. 3B). Infracapitular bay deep and broad, U-shaped; only the tips of Cx-I and Cx-II exceeding the anterior margin of idiosoma; Gf rectangular, L/W ratio 1.6, genital flaps with 14 pairs of setae at the margins; E 4 at the same level as the 4 th pair of acetabula; Ap slightly away from the line of primary sclerotization, on the same line with V 2 and posterior to V 1 (Fig. 3A). Infracapitulum acute triangle-like in the lateral view (Fig. 3C). P-1 short, with a dorsal seta; P-2 with three dorsal setae and a ventral seta on the ventrodistal protrusion; P-3 with two short and a long setae dorsally, and a seta on the ventrodistal protrusion; P-4 with three dorsal setae, a long and two short setae on two ventral protrusions; P-5 with a long dorsal and a long ventral setae (Fig. 3E). Measurements. Idiosoma L 663, W 529. Dorsal shield L 597, W 483, dorsal plate L 530, frontal platelets L 160, W 83, shoulder platelets L 187, W 83. Infracapitular bay depth 137; Cx-1 L 249, mL 113, Cx-II +III mL 73; Gf L 188, W 116, distance between Gf and Ap 213. Gnathosoma vL 208, dL 150, chelicera bs L 177, claw L 60. Ejaculatory complex (Fig. 3D), L 209, aL 163. L of palp: P-1, 26; P-2, 67; P-3, 43; P-4, 70; P-5, 24. L of leg segments: I-L-1���6: 42, 97, 98, 120, 127, 116; II-L-1���6: 47, 100, 90, 116, 135, 132; III-L-1���6: 60, 75, 105, 127, 142, 148; IV-L-1���6: 95, 121, 119, 176, 183, 165. Female. Not collected. Deutonymph (n = 1): Body features same as the male except: frontal platelets L/W ratio 2.0, shoulder platelets L/W ratio 2.6 (Fig. 5A). Cx-II +III mL shorter than male; E 4 at the same level as the 5 th pair of acetabula; Gf pentagonal, L/W ratio 1.2, genital flaps with 20 setae at the margins (Fig. 5B). Measurements. Dorsal shield L 660, W 547, dorsal plate L 591, frontal platelets L 183, W 92, shoulder platelets L 214, W 83. Infracapitular bay L 175; Cx-1 L 303, mL 127, Cx-II +III mL 40; Gf L 225, W 187. Gnathosoma vL 253, dL 176, chelicera bs L 227, claw L 175. L of palp: P-1, 33; P-2, 85; P-3, 54; P-4, 79; P-5, 30. L of leg segments: I-L-1���6: 72, 114, 111, 146, 148, 138; II-L-1���6: 57, 115, 99, 142, 152, 140; III-L-1���6: 42, 123, 97, 147, 178, 163; IV-L-1���6: 130, 163, 149, 210, 209, 202. Habitat. Stream about 20 centimeters depth, 5 meters wide, located between the mountains and a farmland; with mayflies and leeches as associated fauna. Remarks. Due to the characteristic shape of infracapitulum, gnathosoma with a short rostrum; Cx-II+III mL short; Gf rectangular; only the tips of Cx-I and Cx-II exceeding to the anterior margin of idiosoma, the specimens from China show a general conformity with that from Thailand (Pe��ić & Smit 2009a). The species is firstly recorded for Chinese fauna. The two populations are slightly different: (1) the shape of the ejaculatory complex: spindly flask in the Chinese population, but round-bottom flask in the Thai population; (2) the lateral view of infracapitulum: regular trianglelike in the Chinese population, while acute triangle-like in Thai population. Distribution. China (Doupengshan); Thailand (Pe��ić & Smit 2009a)., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on pages 105-107, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Pesic, V. & Smit, H. (2009 a) Water mites of the family Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia) from Thailand, Part I. The genera Torrenticola Piersig, 1896, Neoatractides Lundblad, 1941 and Pseudotorrenticola Walter, 1906. Zootaxa, 1982, 38 - 62. https: // doi. org / 10.11646 / zootaxa. 1982.1.2"]}

Torrenticola tetrapora (K. Viets, 1935) Material examined. Doupengshan, Guizhou Province, China (26°23’1”N, 107°22’28”E, 1090 m a.s.l.), stream, collected by Xinyao Gu, 3. X.2016, 2/3/0, No. GZ-TO-20161001–GZ-TO-20161005. Habitat. Stream about 10 meters wide, between two mountains; with mayflies, and leeches as associated fauna. Remarks. The species was previously known from India, and firstly reported by Guo & Jin (2005b) in China. Distribution. China (Fanjingshan, Kuankuoshui, Xishui, Doupengshan), India, Burma, Peninsular Malaysia, Indonesia, Brunei, Thailand (Cook 1967, Guo & Jin 2006a, 2006b, Pešić & Smit 2009a, Zhang & Guo 2012)., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on page 102, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Viets, K. (1935) Die Wassermilben von Sumatra, Java und Bali nach den Ergebnissen der Deutschen Limnologischen Sunda- Expedition. Archiv fur Hydrobiologie, Supplement, 13 (1 - 2), 484 - 738.","Guo, J. J. & Jin, D. C. (2005 b) Prostigmata, Sperchontidae, Torrenticolidae. In: Yang, M. F. & Jin, D. C. (Eds.), The Landscape Insects of Dashahe. Guizhou People's Press, Guiyang, pp. 552 - 556. [in Chinese]","Cook, D. R. (1967) Water mites from India. Memoirs of the American Entomological Institute, 9, 1 - 411.","Guo, J. J. & Jin, D. C. (2006 a) Sperchontidae, Lebertiidae, Torrenticolidae. In: Li, Z. Z. & Jin, D. C. (Eds.), The landscape insects of Fanjingshan. Guizhou Science and Technology Publishing House, Guiyang, pp. 702 - 708. [in Chinese]","Guo, J. J. & Jin, D. C. (2006 b) Sperchontidae, Lebertiidae, Torrenticolidae. In: Li, Z. Z. & Jin, D. C. (Eds.), Insects from Chishui Spinulose tree fern landscape. Guizhou Science and Technology Publishing House, Guiyang. pp. 370 - 371. [in Chinese]","Pesic, V. & Smit, H. (2009 a) Water mites of the family Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia) from Thailand, Part I. The genera Torrenticola Piersig, 1896, Neoatractides Lundblad, 1941 and Pseudotorrenticola Walter, 1906. Zootaxa, 1982, 38 - 62. https: // doi. org / 10.11646 / zootaxa. 1982.1.2","Zhang, P. & Guo, J. J. (2012) Sperchontidae, Lebertiidae, Torrenticolidae. In: Dai, R. H., Li, Z. Z. & Jin, D. C. (Eds.), The landscape insects of Kuankuoshui. Guizhou Science and Technology Publishing House, Guiyang, pp. 716 - 719. [in Chinese]"]}

Genus Monatractides K. Viets, 1926 Diagnosis: see Wiles 1997: 202., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on page 113, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Wiles, P. R. (1997) Asian and Oriental Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia: Lebertioidea): a revision of the fam- ily and description of new species of Torrenticola Piersig and Pseudotorrenticola Walter, from Southeast Asia. Journal of Natural History, 31, 191 - 236. https: // doi. org / 10.1080 / 00222939700770121"]}

Torrenticola tenuichelicera Gu & Guo, 2018 (Figs. 1���2) Material examined. Doupengshan, Guizhou Province, China (26��22���4���N, 107��21���55���E, 1407 m a.s.l.), stream, collected by Xinyao Gu, 2. X.2016, 1/2/0, No. GZ-TO-20161006���GZ-TO-20161008. Description. Male (n = 1): Idiosoma elliptical, L/W ratio 1.4 (Fig. 1A). Dorsal plate (4+1), frontal platelets L/W ratio 2.4, shoulder platelets L/W ratio 2.6; E 4 on the same line with the 3 rd pair of acetabula; genital field L/W ratio 1.3 (Fig. 1B). P-2 long, with five dorsal setae and its ventral margin convex, with a short ventrodistal prolongation, which is blunt, slightly curved towards the distal, and with a seta at the base; P-3 with two setae on dorsum and a ventrodistal cone-shaped prolongation; P-4 with two developed ventral prolongations (Fig. 1C). Measurements. Idiosoma L 790, W 565. Dorsal shield L 630, W 513, dorsal plate L 586, frontal platelets L 162, W 68, shoulder platelets L 196, W 74. Infracapitular bay L 156; Cx-I L 298, mL 141, Cx-II +III mL 106; Gf L 187, W 140, distance between Gf and Ap 108. Gnathosoma vL 355, dL 260, chelicera bs L 340, claw L 56. Ejaculatory complex (Fig. 1D), L 229, aL 153. L of palp: P-1, 38; P-2, 102; P-3, 60; P-4, 79; P-5, 17. L of leg segments: I-L-1���6: 35, 89, 72, 92, 111, 101; II-L-1���6: 45, 88, 70, 93, 114, 110; III-L-1���6: 49, 100, 87, 109, 131, 106; IV-L-1���6: 106, 105, 122, 145, 152, 135. Female (n = 2): Idiosoma elliptical, L/W ratio 1.4 (1.3); Dorsal plate (4+1), frontal platelets trapezoid, L/W ratio 2.2 (2.3), shoulder platelets rectangular, laterally rounded, L/W ratio 2.7 (2.4) (Fig. 2B). Infracapitular bay deep and broad, V-shaped; E 4 on the same line with the 5 th pair of acetabula; genital field nearly pentagonal, L/W ratio 1.1 (1.1); Ap posterior to V 3 , anterior to V 2 , and on the same line with V 1 (Fig. 2A). P-1 with a dorsal seta; P-2 long, with six dorsal setae and one ventrodistal blunted protrusion, which slightly curved towards distally and with one seta at the base; P-3 with two dorsal setae and one ventrodistal cone-shaped protrusion; P-4 with one dorsal seta, two ventral protrusions, ending in two blunt tips separated by a concavity, and with three setae on them (Fig. 2G). Gnathosoma elongated, rostrum very long and slender, chelicera long and straight (Fig. 2H). Measurements. Idiosoma L 780 (843), W 557 (632). Dorsal shield L 603 (683), W 484 (527), dorsal plate L 553 (618), frontal platelets L 151 (170), W 68 (73), shoulder platelets L 199 (196), W 73 (83). Infracapitular bay depth 154 (177); Cx-1 L 292 (340), mL 138 (163), Cx-II +III mL 67 (80); Gf L 183 (187), W 170 (175), distance between Gf and Ap 145 (147). Gnathosoma vL 362 (386), dL 251 (288), chelicera bs L 399 (372), claw L 53 (59). L of palp segments: P-1, 40 (36); P-2, 108 (118); P-3, 61 (68); P-4, 80 (84); P-5, 15 (19). L of leg segments: I-L-1���6: - (50), 88 (87), 72 (87), 88 (97), 104 (109), 100 (93); II-L-1���6: 52 (46), 90 (70), 71 (73), 98 (101), 107 (113), 103 (103); III-L-1���6: 45, 103, 77 (83), 119 (100), 133 (143), 119 (123); IV-L-1���6: 115 (100), 103 (107), 130 (119), 148 (147), 157 (160), 136 (154). Habitat. Stream about 20 centimeters depth, 5 meters wide, located between the mountains and a farmland; with mayflies and leeches as associated fauna. Remarks. This species shows a general conformity with specimens of T. tenuichelicera, characterized by gnathosoma elongated, chelicera long and straight; P-2 ventral margin convex, ventrodistal protrusion bluntly pointed, slightly curved towards distally, and with a seta at the base; P-3 with two dorsal setae, and a ventrodistal coneshaped protrusion; P-4 with two developed ventral protrusions, with three setae. T. tenuichelicera was previously known from Fodingshan (Foding Mountain), China, and only described in the male sex. In this paper, the description of the female is given for the first time. The two populations are different slightly: (1) E 4 on the same line with the 3 rd pair of acetabula in male, and the 5 th pair in female in Doupengshan population, while on the 4 th line in male in Fodingshan population; (2) P-2 with five dorsal setae in male and six dorsal setae in female in Doupengshan population, but with eight dorsal setae in male in Fodingshan population. Distribution. China (Doupengshan, Fodingshan) (Gu, Jin, Yi & Guo 2018)., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on pages 102-105, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Gu, X. Y., Jin, D. C., Yi, T. C. & Guo, J. J. (2018) Chinese water mites of the genus Torrenticola Piersig, 1896 (Acari, Hydrachnidia, Torrenticolidae), with descriptions of two new species and a new record from Foding Mountain. Systematic & Applied Acarology, 23 (10), 1972 - 1985. https: // doi. org / 10.11158 / saa. 23.10.9"]}

Monatractides oxystomus (K. Viets, 1935) Material examined. Doupengshan, Guizhou Province, China (26°23’1”N, 107°22’28E, 1090 m a.s.l.), stream, collected by Xinyao Gu, 2. X.2016, 2/2/0, No. GZ-TO-20161023–GZ-TO-20161026. Habitat. Stream about 20 centimeters depth, 5 meters wide, located between the mountains and a farmland; with mayflies and leeches as associated fauna. Remarks. The species was previously known from Sumatra, while reported by Guo & Jin (2005b) from China. Distribution. China (Guizhou, Anhui, Hainan), (“ Atractides oxystomus ”, K. Viets 1935; Guo & Jin 2005b), Indonesia (“ Atractides oxystomus ”, K. Viets 1935; “ Torrenticola oxystoma ”, Lundblad 1971), Thailand (Monatractides oxystomus, Pešić & Smit 2009b), India (Pešić et al. 2013, Pešić et al. 2019), Malaysia (Pešić & Smit 2014)., Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on page 113, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Viets, K. (1935) Die Wassermilben von Sumatra, Java und Bali nach den Ergebnissen der Deutschen Limnologischen Sunda- Expedition. Archiv fur Hydrobiologie, Supplement, 13 (1 - 2), 484 - 738.","Guo, J. J. & Jin, D. C. (2005 b) Prostigmata, Sperchontidae, Torrenticolidae. In: Yang, M. F. & Jin, D. C. (Eds.), The Landscape Insects of Dashahe. Guizhou People's Press, Guiyang, pp. 552 - 556. [in Chinese]","Lundblad, O. (1971) Weitere Beitrage zur Kenntnis der Fliesswassermilben Javas. Arkiv for Zoologi, Serie 2, 23 (5), 293 - 359.","Pesic, V. & Smit, H. (2009 b) Water mites of the family Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia) from Thailand, Part II. The genus Monatractides K. Viets. Zootaxa, 2012 (1), 1 - 27. https: // doi. org / 10.11646 / zootaxa. 2012.1.1","Pesic, V., Chatterjee, T., Das, M. K. & Bordoloi, S. (2013) A new species of water mite (Acari, Hydrachnidia) from Assam, India, found in the gut contents of the fish Botia dario (Botiidae). Zootaxa, 3746 (3), 454 - 462. https: // doi. org / 10.11646 / zootaxa. 3746.3.4","Pesic, V., Smit, H. & Bahuguna, P. (2019) New records of water mites (Acari: Hydrachnidia) from the Western Himalaya with the description of four new species. Systematic & Applied Acarology, 24 (1), 59 - 81. https: // doi. org / 10.11158 / saa. 24.1.5","Pesic, V. & Smit, H. (2014) Torrenticolid water mites (Acari: Hydrachnidia: Torrenticolidae) from Malaysian Borneo. Zootaxa, 3840 (1), 1 - 72. https: // doi. org / 10.11646 / zootaxa. 3840.1.1"]}

Gu, Xinyao, Zhang, Ping, Jin, Daochao, Guo, Jianjun (2018): A new species representing a new record genus Neoatractides from China (Acari: Hydrachnidia: Torrenticolidae). Zoological Systematics 43 (3): 335-338, DOI: 10.11865/zs.201829, URL: http://zoobank.org/3bccd646-fc4d-4685-912f-e28d4787da70

Family Torrenticolidae Piersig, 1902 Diagnosis: Wiles 1997: 197 Genus Torrenticola Piersig, 1896 Diagnosis: Wiles 1997: 203, Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on page 102, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206, {"references":["Wiles, P. R. (1997) Asian and Oriental Torrenticolidae Piersig, 1902 (Acari: Hydrachnidia: Lebertioidea): a revision of the fam- ily and description of new species of Torrenticola Piersig and Pseudotorrenticola Walter, from Southeast Asia. Journal of Natural History, 31, 191 - 236. https: // doi. org / 10.1080 / 00222939700770121"]}