Torrenticola wuyiensis Gu & Guo, 2020

Gu, Xin-Yao, Jin, Dao-Chao & Guo, Jian-Jun, 2020, Three new species and one new record of Torrenticolidae (Acari, Hydrachnidia) from Wuyishan with an updated key for Chinese fauna, European Journal of Taxonomy 625, pp. 1-23 : 12-16

Torrenticola wuyiensis Gu & Guo sp. nov.

urn:lsid:zoobank.org:act:69E7FE0A-89D6-4CF0-8E20-7E007FA65B62

Figs 9–12

Diagnosis

Idiosoma elliptical; dorsal plate arrangement: 2+2p+1, posterior pair of anterior platelets half fused to dorsal plate; infracapitular bay wide U-shaped; E 4 on same line with 5 th pair of acetabula.

Etymology

This new species is named after Wuyishan (Wuyi Mountain), where the new species was collected.

Material examined

Holotype

China • ♂; Wuyishan ; 27°44′24″ N, 117°41′18″ E, 860 m a.s.l.; 2 Aug. 2018; X.Y. Gu leg.; FJ- TO-20180807.

Paratypes

China • 1 ♂, 4 ♀♀; same collection data as for holotype; FJ-TO-20180808 to FJ-TO-20180812 .

Description

Male (n = 2)

BODY. Idiosoma elliptical, L/W ratio 1.44 (1.38) ( Fig. 9B ). Dorsal plate arrangement: 2+2p+1 ( Fig. 9A ). Infracapitular bay wide U-shaped, Cx-II–III mL relatively short; E 4 on same line with 5 th pair of acetabula; V 1 anterior to V 2, V 2 almost at same level of Ap ( Fig. 9B ). Gnathosoma dorsal apodeme short, ventral

apodeme long, rostrum curved slightly to ventrum ( Fig. 9D ). Ejaculatory complex with well developed anterior keel and proximal arms ( Fig. 9E ). Palp: P-1 short, with one dorsal seta; P-2 with three dorsal setae, one ventral seta at base of sharp ventral prolongation; P-3 with two dorsal setae, one ventral seta on sharp ventral prolongation; P-4 with two ventral extensions, bearing four setae ( Fig. 9C ). Legs I–IV showed as Fig. 10 .

MEASUREMENTS. Idiosoma L 745 (746), W 514 (539); dorsal shield L 607 (614), dorsal plate L 568 (578), frontal platelets L 127 (132). Infracapitular bay L 128 (154); Cx-1 L 207 (204), mL 132 (113), Cx-II–III mL 73 (87); Gf L 158 (162), W 100 (109), distance between Gf and Ap 158 (144). Gnathosoma vL 331 (341), dL 252 (274), chelicera bs L 352 (320), claw L 49 (67). Ejaculatory complex ( Fig. 13E ), L 195 (221), aL 146 (160) width 96 (113). L of palp segments: P-1, 44 (40); P-2, 111 (98); P-3, 61 (60); P-4, 91 (83); P-5, 19 (20). L of leg segments: I-L-1–6: - (43); 96 (92), 78 (91), 100 (102), 119 (118), 127 (110); II-L-1–6: 42 (47), 99 (96), 86 (80), 101 (102), 114 (117), 105 (121); III-L-1–6: 37 (53), 91 (108), 77 (85), 100 (124), 117 (149), 118 (143); IV-L-1–6: 114 (112), 108 (115), 124 (127), 171 (164), 176 (174), 177 (178).

Female (n = 4)

BODY. Body features same as male except: P-2 with four dorsal setae; P-3 with three dorsal setae ( Fig. 11C ); gnathosoma ventral apodeme shorter and thicker ( Fig. 11D ).

MEASUREMENTS. Idiosoma L 826 (705–826), W 573 (495–573). Dorsal shield L 691 (585–691), dorsal plate L 652 (551–652), frontal platelets L 146 (131–146). Infracapitular bay depth 176 (136–176); Cx-I

L 171 (132–171), mL 136 (119–136), Cx-II–III mL 54 (54–78). Gf L 169 (154–169), W 139 (110– 139), distance between Gf and Ap 186 (144–186). Gnathosoma vL 363 (323–363), dL 269 (249–269), chelicera bs L 325 (325–378), claw L 63 (59–63). L of palp: P-1, 49 (39–49); P-2, 127 (105–127); P-3, 75 (62–75); P-4, 102 (94–102); P-5, 22 (22–23). L of leg segments: I-L-1–6: 45 (42–45), 100 (95–100), 90 (83–90), 110 (101–110), 117 (109–117), 116 (108–116); II-L-1–6: 47 (45–47), 108 (97–108), 81 (75–81), 113 (99–113), 126 (116–126), 130 (127–130); III-L-1–6: 57 (45–57), 121 (69–121), 92 (82– 92), 138 (115–138), 154 (144–154), 154 (154–155); IV-L-1–6: 113 (113–116), 122 (111–122), 133 (119–133), 172 (154–172), 185 (177–185), 185 (179–185).

Distribution

China (Wuyishan).

Habitat

Streamlet.

Remarks

This new species is similar to Torrenticola ussuriensis (Sokolow, 1940) in the shape of the palp and dorsal plates,. T. ussuriensis was originally described by Sokolow (1934) from the Primory Territory in the Russian Far East, and later reported from River Inôzava in Japan ( Enami 1940), and from Korea ( Pešić et al. 2013). Differences between T. wuyiensis and T. ussuriensis are given in Table 1.

Figures

Fig. 9. Torrenticola wuyiensis Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180807). A. Dorsal view. B. Ventral view. C. Palp, lateral view. D. Infracapitulum and chelicera. E. Ejaculatory complex. Scale bars = 100 μm.

Fig. 10. Torrenticola wuyiensis Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180807). A. leg-I-2–6. B. leg-II. C. leg-III. D. leg-IV-1–4. E. leg-IV-5–6. Scale bar = 100 μm.

Fig. 11. Torrenticola wuyiensis Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180812). A. Dorsal view. B. Ventral view. C. Palp, lateral view. D. Infracapitulum and chelicera. Scale bars = 100 μm.

Fig. 12. Torrenticola wuyiensis Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180812). A. leg-I. B. leg-II. C. leg-III. D. leg-IV-1–4. E. leg-IV-5–6. Scale bar = 100 μm.

Fig. 13. Torrenticola dentifera Wiles, 1991, ♂ (FJ-TO-20180806). A. Dorsal view. B. Ventral view. C. Palp, lateral view. D. Infracapitulum and chelicera. Scale bars = 100 μm.