Torrenticola changbaiensis, 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 : 253-255

Torrenticola changbaiensis sp. nov.

( Figs. 7–8 )

Material examined. Holotype male, No. JL-TO-20190706, Changbaishan National Nature Reserve KHƜOiẎ ȐŊṂṚṔṈ), Jilin Province, P. R. China (42°24′19′′N, 128°17′38′′E, 721 m a.s.l.), collected by Zhuhui Ding and Caiyun Li, 30-VII-2019 . Paratype: 3/0/0, No. JL-TO-20190707 – JL-TO-20190709, same data as holotype.

Diagnosis. Dorsal plate arrangement: 2+2p+1 ( Fig.7A ); E 4 on the same line with the 3 rd pair of acetabula; infracapitular bay U-shaped; V 1 anterior to V 2, V 2 almost at the same level of Ap; P-4 with one small dorsal seta and two developed ventral extensions, with one long and one short setae on each.

Description. Male (n = 4): Idiosoma elliptical( Fig. 7B ), L 666 (649–675), W 459 (459–505), L/W ratio1.5 (1.3–1.5). Dorsal plate arrangement: 2+2p+1 ( Fig. 7A ), dorsal shied L 544 (519–563), W 422 (403–432), dorsal plate L 504 (483–512), frontal platelets L 132 (132–153), W 57 (47–57), shoulder platelets W 68 (46–69). Infraca- pitular bay U-shaped, L 142 (137–142); Cx-I L 255 (247–258), mL 115 (111–117), Cx-II+III mL 95 (94–101); Gf L 168 (155–168), W 128 (117–129), E 4 on the same line with the 3 rd pair of acetabula;distance between Gf and Ap 97 (88–97); V 1 anterior to V 2, V 2 almost at the same level of Ap ( Fig.7B ). Gnathosoma dL 206 (205–212), vL 275 (258–275); rostrum short (<1/2 of gnathosoma dL), dorsal apodemeshort, ventral apodeme slender and craved to dorsum; chelicera bs L 291 (288–291), claw L 31 (30–33). Palp ( Fig. 7C ): P-1 short, with one dorsodistal seta; P-2 with three dorsal setae, and one ventral seta on the ventral extension; P-3 with two dorsal setae and one long ventral seta on the extension; P-4 with one small dorsal seta, one long and one short ventral setae on two ventral extensions respectively. L of palp segments: P-1, 32 (31–36); P-2, 91 (87–93); P-3, 58 (46–58); P-4, 87 (87–93); P-5, 17 (14–18). Legs ( Fig. 8 B-F): L of leg segments: I-L-1–6: 45 (44–54), 86 (78–86), 76 (72–78), 94 (84–94), 99 (82–99), 91 (91–93); II-L-1–6: 48 (48–62), 82 (81–88), 69 (69–72), 89 (84–89), 100 (100–108), 106 (106–115); III-L-1–6: 48 (44–49), 96 (86–96), 91 (91–110), 113 (101–113), 127 (122–128), 124 (124–132); IV-L-1–6: 100 (100–104), 115 (96–115), 110 (110–112), 138 (136–138), 140 (139–156), 134 (134–154). Ejaculatory complex ( Fig. 8A ) L 223 (223–280), aL 156 (150–157).

Female. Unknown.

Habitat. River, about 8 m wide, 1 m depth; water is cold and torrential. The river is about 15 m away from the highway.

Remarks. The new species is characterized by dorsal plate arrangement 2+2p+1; E 4 on the same line with the 3 rd pair of acetabula; P-4 with two developed ventral extensions; dorsal apodeme short, ventral apodeme slender and craved to dorsum. This species can be easily distinguished from other species by those characteristics.

Etymology. This new species is named after the place (Changbai Mountain), where the new species was collected.

Distribution. China (Jilin).

Figures

FIGURE 7. Torrenticola changbaiensis sp. nov., male: A = dorsal view; B = ventral view; C = palp; D = infracapitulum and chelicera. Scale bars = 100 μm.

FIGURE 8. Torrenticola changbaiensis sp. nov., male: A = ejaculatory complex; B = Leg-I; C = Leg-II; D= Leg-III; E= Leg- IV-1–3; F = Leg-IV-4–6. Scale bars = 100 μm.