Torrenticola trigona Gu & Jin & Yi & Guo 2019, sp. nov.
Creators: name: Gu, Xinyao
name: Jin, Daochao
name: Yi, Tianci
name: Guo, Jianjun
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae
Torrenticola
Torrenticola trigona

description: Torrenticola trigona Gu & Guo, sp. nov.
(Figs. 6–9)
Material examined. Holotype male, No. GZ-TO-20161011, Doupengshan, Guizhou Province, China (26°22′18′′N, 107°21′53′′E, 1038 m a.s.l.), stream, collected by Xinyao Gu, 2. X.2016. Paratypes, 7/4/0, No. GZ-TO-20161012– GZ-TO-20161022, same data as holotype.
Diagnosis. Idiosoma elliptical; infracapitular bay U-shaped; only the tips of Cx-I and Cx-II exceeding the anterior margin of idiosoma; Ap slightly away from the line of primary sclerotization and anterior to V 2, at the same line with V 1; the lateral view of infracapitulum regular triangle-like.
Description. Male (n = 8): Idiosoma elliptical, L/W ratio 1.4 (1.3–1.4). Dorsal plate (4+1), frontal platelets L/W ratio 1.8 (1.7–2.2), shoulder platelets L/W ratio 2.0 (2.0–2.4) (Fig. 6A). Infracapitular bay U-shaped; only the tips of Cx-I and Cx-II exceeding the anterior margin of idiosoma; Gf elongated-oval, L/W ratio 1.4 (1.4–1.5), genital flaps with 15 pairs of setae at the margins; E 4 at the same level as the 5 th pair of acetabula; Ap away from the line of primary sclerotization and anterior to V 2, at the same line with V 1. P-1 short, with one dorsodistal seta; P-2 with three dorsal setae, and a ventral seta on the ventrodistal prolongation; P-3 with two setae on dorsum and one ventrodistal seta on the ventrodistal prolongation; P-4 with three dorsal setae, a long and three short setae on two ventral protrusions, two fine setae and one heavy mediodistal seta (Fig. 6D). The lateral view of infracapitulum regular triangle-like, dorsal apodeme serrated (Fig. 6E).
Measurements. Idiosoma L 783 (687–837), W 573 (525–627). Dorsal shield L 700 (610–760), W 507 (485– 560), dorsal plate L 588 (557–680), frontal platelets L 163 (165–167), W 93 (76–98), shoulder platelets L 184 (178–217), W 91 (88–91). Infracapitular bay L 137 (137–163); Cx-1 L 244 (244–273), mL 106 (106–132), Cx-II +III mL 86 (60–90); Gf L 183 (163-197), W 127 (111–133), distance between Gf and Ap 148 (138–148). Gnathosoma vL 208 (204–222), dL 173 (143–173), chelicera bs L 191 (174–206), claw L 55 (55–59). Ejaculatory complex (Fig. 6C), L 226 (201–249), aL 160 (145–180). L of palp: P-1, 30 (27–30); P-2, 61 (61–70); P-3, 48 (42–48); P-4, 73 (73–75); P-5, 26 (22–26). L of leg segments: I-L-1–6: 40 (40–56), 105 (92–105), 105 (90–105), 129 (110–129), 137 (135–137), 125 (120–130); II-L-1–6: 44 (40–44), 99 (80–99), 100 (93–100), 123 (113–125), 140 (130–140), 144 (113–144); III-L-1–6: 47–63, 115 (63–115), 89 (82–92), 132 (98–138), 150 (137–152); IV-L-1–6: 123 (118–127), 126 (126–150), 128 (113–128), 176 (176–183), 192 (177–192), 176 (160–176).
Female (n = 4): Body features same as the male except: Idiosoma L/W ratio 1.3 (1.2–1.3); frontal platelets L/W ratio 1.8 (1.8–1.9), shoulder platelets L/W ratio 2.0 (2.0–2.6), Gf pentagonal, L/W ratio 1.3 (1.2–1.4), Ap away from the line of primary sclerotization, at the same line with V 1 and V 2 (Fig. 8B).
Measurements. Idiosoma L 820 (720–823), W 650 (590–650). Dorsal shield L 760 (670–760), W 602 (548– 602), dorsal plate L 687 (592–687), frontal platelets L 177 (172–177), W 97 (90–97), shoulder platelets L 203 (202–204), W 100 (77–100). Infracapitular bay L 173 (171–173); Cx-1 L 310 (291–310), mL 137 (120–137), Cx-II +III mL 47 (28–47); Gf L 230 (216–232), W 172 (171–173), distance between Gf and Ap 210 (189–210). Gnathosoma vL 240 (227–242), dL 168 (165–168), chelicera bs L 231 (208–233), claw L 114 (69–121). L of palp: P-1, 31 (29–32); P-2, 78 (72–78); P-3, 62 (47–62); P-4, 76 (73–77); P-5, 28 (27–28). L of leg segments: I-L-1–6: 44 (40–45), 112 (108–113), 109 (96–109), 136 (133–136), 150 (146–152), 143 (134–143); II-L-1–6: 51 (50–52), 110 (106–110), 108 (97–110), 137 (135–137), 151 (150–151), 140 (136–140); III-L-1–6: 61 (60–62), 119 (103–119), 98 (96–98), 141 (133–142), 161 (153–163), 163 (152–165); IV-L-1–6: 129 (111–131), 158 (135–160), 148 (146–149), 200 (199–201), 208 (208–209), 192 (183–194).
Habitat. Stream about 20 centimeters depth, 5 meters wide, located between the mountains and a farmland; with mayflies and leeches as associated fauna.
Remarks. This new species is similar to T. siamis. Compared with T. siamis, we can see: (1) the location of V 4 which is close to the posterior line of Gf, while in T. siamis it is close to the posterior of idiosoma; (2) gnathosoma dorsal apodeme serrated in the new species, but smooth in T. siamis; (3) the lateral view of infracapitulum regular triangle-like in T. trigona, but acute triangle-like in T. siamis.
Etymology. Named after the characters of the shape of gnathosoma, “trigon-” means triangular.
Distribution. China (Doupengshan).
description: Published as part of Gu, Xinyao, Jin, Daochao, Yi, Tianci & Guo, Jianjun, 2019, Contributions to the knowledge of Torrenticolid water mites (Acari: Hydrachnidia) in Doupengshan, China, pp. 101-121 in Zootaxa 4695 (2) on pages 109-113, DOI: 10.11646/zootaxa.4695.2.1, http://zenodo.org/record/3531206