Torrenticola acrisarostrum, Gu & Jia & Jin & Guo, 2020

Gu, Xinyao, Jia, Lan, Jin, Daochao & Guo, Jianjun, 2020, Four new species of Torrenticola (Acari, Hydrachnidia, Torrenticolidae) from Northeastern China, Zootaxa 4779 (2), pp. 245-259 : 255-256

Torrenticola acrisarostrum sp. nov.

( Figs. 9–10 )

Material examined. Holotype male, No. JL-TO-20190710, 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: 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).

Figures

FIGURE 9. Torrenticola acrisarostrum sp. nov., male: A = dorsal view; B = ventral view; C = palp; D = infracapitulum and chelicera. Scale bars = 100 μm.

FIGURE 10. Torrenticola acrisarostrum sp. nov., male: A = Leg-I; B = Leg-II; C= Leg-III; D= Leg-IV-1–4; E = Leg-IV-5–6; F =Ejaculatory complex. Scale bars = 100 μm.