Torrenticola songhuaensis Gu & Jia & Jin & Guo 2020, sp. nov.

Torrenticola songhuaensis sp. nov.

(Figs. 5–6)

Material examined. Holotype female, No. JL-TO-20190704, Songhuajiangsanhu National Nature Reserve (LJAE ỨĀOiDZğȐŊ ṂṚṔṈ), 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 (Pešić & 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).