Contributions to Chinese fauna of Torrenticolidae Piersig, 1902 (Acari, Hydrachnidia), with the description of three new species Author Gu, Xin-Yao Institute of Entomology, Guizhou University, Guizhou Provincial Key Laboratory for Plant Pest Management of the Mountainous Region, the Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agriculture, China, Guiyang 550025, China Author Jia, Lan Institute of Entomology, Guizhou University, Guizhou Provincial Key Laboratory for Plant Pest Management of the Mountainous Region, the Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agriculture, China, Guiyang 550025, China Author Jin, Dao-Chao Institute of Entomology, Guizhou University, Guizhou Provincial Key Laboratory for Plant Pest Management of the Mountainous Region, the Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agriculture, China, Guiyang 550025, China Author Guo, Jian-Jun Institute of Entomology, Guizhou University, Guizhou Provincial Key Laboratory for Plant Pest Management of the Mountainous Region, the Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agriculture, China, Guiyang 550025, China https://orcid.org/0000-0002-0523-6704 jjguo@gzu.edu.cn text ZooKeys 2020 955 97 111 http://dx.doi.org/10.3897/zookeys.955.52584 journal article http://dx.doi.org/10.3897/zookeys.955.52584 1313-2970-955-97 AB18D54108E849DAB5437D2F127A4E82 12927ACF50975D7C950511826047E3DD Torrenticola anziensis Gu & Guo sp. nov. Figures 3 , 4 Material examined. Holotype : ♀ (SC-TO-20160701), Anzihe, Chongzhou, Sichuan Province, P. R. China ( 30°47'43"N , 103°12'36"E , 1690 m a.s.l.), collected by Zhuhui Ding, 29-VII-2016. Paratype : 1 ♀ (SC-TO-20160702), same data as holotype. Diagnosis. Dorsal plate 4+1; infracapitular bay U-shaped and wide; genital flaps with six pairs of setae at the margins; E4 at the same level as the 3rd pair of acetabula; V1 fused with the line of primary sclerotization; gnathosoma: rostrum long, dorsal apodemes short and sharp, ventral apodemes slender and sharp, claw short. Description. Female ( n = 2) : Idiosoma elliptical, L 840 (836), W 583 (576), L/W ratio 1.4 (1.5). Dorsal plate 4+1 (Fig. 3A ), dorsal shield L 680 (668), W 520 (505), dorsal plate L 617 (602), frontal platelets L 162 (158), W 78 (76), shoulder platelets L 220 (218), W 87 (89). Infracapitular bay U-shaped and wide, depth 175 (162); Cx-I L 317 (315), mL 83 (81), Cx-II+III mL 99 (89); Gf L 200 (208), W 140 (144), L/W ratio 1.4 (1.4), genital flaps with six pairs of setae at the margins; distance between Gf and Ap 123 (134); E4 at the same level as the 3rd pair of acetabula; Ap on the same line with V2 , V1 fused with the line of primary sclerotization, and V1 anterior to V2 (Fig. 3B ). Gnathosoma (Fig. 3D ): rostrum long, dorsal apodemes short and sharp, ventral apodemes slender and sharp, claw short; vL 355 (336), dL 256 (242); chelicera bs L 378 (369), claw L 63 (58). P-1 with one long dorsal seta; P-2 with three dorsal setae and one ventral seta at the base of the ventral extension; P-3 with two dorsal setae and one long seta at the base of the ventral extension; P-4 with one mediodistal seta and two ventral setae at two ventral extensions (Fig. 3C ). dL of palp segments: P-1, 42 (39); P-2, 113 (109); P-3, 67 (66); P-4, 93 (95); P-5, 18 (16). Legs (Fig. 4 ): dL of leg segments: I-L-1-6: 44 (39), 95 (102), 88 (85), 102 (108), 110 (116), 96 (101); II-L-1-6: 43 (45), 98 (102), 93 (94), 121 (118), 136 (129), 149 (139); III-L-1-6: 43 (45), 98 (102), 81 (85), 101 (108), 117 (115), 114 (121); IV-L-1-6: 107 (102), 118 (115), 125 (119), 161 (158), 179 (183), 166 (171). Figure 3. Torrenticola anziensis Gu & Guo, sp. nov., female A dorsal view B ventral view C palp, lateral view D infracapitulum and chelicera. Scale bars: 100 μm . Male. Unknown. Habitat. Streamlet. Remarks. Due to the characteristic shape of gnathosoma and dorsal shield (i.e., gnathosoma with a long rostrum, dorsal and ventral apodemes sharp), this new species is similar to Torrenticola haliki Pesic & Smit, 2010 ( Pesic and Smit 2010 ). However, there are obvious differences between them: (1) ventral projection of P-2 nose-shaped in T. haliki , but normally shaped in this new species; (2) P-4 with one long and three short setae at the base of ventral extensions and one thick mediodistal seta in T. haliki , but only with two ventral setae and one fine mediodistal seta in this new species; (3) ratio Cx-I mL/Cx-II+III mL 1.2 (male), 1.7-2.3 (female) in T. haliki , but 0.8 (female) in this new species. Figure 4. Torrenticola anziensis Gu & Guo, sp. nov., female A leg-I B leg-II C leg-III D leg-IV-1-4 E leg-IV-5, 6. Scale bar: 100 μm . Etymology. This new species is named after Anzi (Anzi River), where the new species was collected. Distribution. China (Sichuan).