Torrenticola triextensio Gu & Jia & Jin & Guo 2020, sp. nov.
Creators: name: Gu, Xinyao
name: Jia, Lan
name: Jin, Daochao
name: Guo, Jianjun
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae
Torrenticola
Torrenticola triextensio

description: Torrenticola triextensio sp. nov.
(Figs. 1–4)
Material examined. Holotype male, No. JL-TO-20190701, Songhuajiangsanhu National Nature Reserve (LJAE ỨĀOiDZğȐŊ ṂṚṔṈ), 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 (<1/2 of gnathosoma dL).
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 Pešić, Semenchenko, Chatterjee, Yam, Chan, 2011 (Pešić 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).
description: 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