Torrenticola anziensis Gu & Guo, 2020

Gu, Xin-Yao, Jia, Lan, Jin, Dao-Chao & Guo, Jian-Jun, 2020, Contributions to Chinese fauna of Torrenticolidae Piersig, 1902 (Acari, Hydrachnidia), with the description of three new species, ZooKeys 955, pp. 97-111 : 97

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).

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 Pešić & Smit, 2010 ( Pešić 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.

Etymology.

This new species is named after Anzi (Anzi River), where the new species was collected.

Distribution.

China (Sichuan).

Figures

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.

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.