Torrenticola suptilisrostrum 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 : 3-7

Torrenticola suptilisrostrum Gu & Guo sp. nov.

urn:lsid:zoobank.org:act:

Figs 1–4

Diagnosis

Idiosoma elliptical; dorsal plate arrangement: 2+2p+1; dorsal plate with a colour pattern, hour-glassshaped with pale “shoulder-patches”; infracapitular bay V-shaped; E 4 on the same line with the 4 th pair of acetabula; infracapitular rostrum extremely slender and slightly curved towards the dorsum.

Etymology

The specific name is from the Latin words “ suptilis ” (slender) and “ rostrum ” (beak), referring to the slender rostrum; used as a noun in apposition.

Material examined

Holotype

China • ♂; Wuyishan ; 27°40′54″ N, 117°47′31″ E, 311 m a.s.l.; 4 Aug. 2018; X.Y. Gu leg.; FJ- TO-20180801.

Paratypes

China • 1 ♂, 1 ♀; same collection data as for holotype; FJ-TO-20180802 to FJ-TO-20180803 . Description

Male (n = 2)

BODY. Idiosoma elliptical, L/W ratio 1.5 (1.5) ( Fig. 1B ). Dorsal plate arrangement: 2+2p+1; dorsal plate with colour pattern, hour-glass-shaped with pale “shoulder-patches” ( Fig. 1A ). Infracapitular bay V-shaped, Cx-II–III mL relatively long; E 4 on same line with 4 th pair of acetabula; V 1 anterior to V 2, V 2 almost at same level of Ap ( Fig. 1B ). Gnathosoma dorsal apodeme short and blunt, ventral apodeme long and wide, rostrum long, extremely slender, curved slightly to dorsum ( Fig. 1C ). Palp ( Fig. 2A ): P-1 long, with one dorsal seta; P-2 with three dorsal setae and one ventral seta on ventrodistal prolongation, which is slender and curved towards distal; P-3 with two dorsal setae and one ventral seta on ventrodistal prolongation; P-4 with two developed ventral extensions, bearing one long and three short setae. Legs I–IV as shown in Fig. 2 B–E. Ejaculatory complex with well developed anterior keel and proximal arms ( Fig. 2F ).

MEASUREMENTS. Idiosoma L 688 (698), W 462 (454); dorsal shield L 563 (563), W 418 (402); dorsal plate L 509 (529), frontal platelets L 122 (115), shoulder platelets L 169 (168). Infracapitular bay depth 160 (170); Cx-1 L 207 (204), mL 104 (105), Cx-II–III mL 103 (99); Gf L 138 (137), W 105 (112), distance between Gf and Ap 118 (133). Gnathosoma vL 351 (359), dL 277 (280), chelicera bs L 307 (376), claw L 39 (44). Ejaculatory complex ( Fig. 2f ), L 177 (166), aL 123 (112), W 85 (78). L of palp segments: P-1, 40 (42); P-2, 114 (121); P-3, 61 (53); P-4, 94 (103); P-5, 16 (13). L of leg segments: I-L-1–6: 39 (35), 82 (78), 85 (83), 99 (102), 106 (112), 92 (94); II-L-1–6: 53 (34), 95 (86), 67 (74), 94 (90), 104 (109), 98 (108); III-L-1–6: 44 (43), 90 (59), 76 (84), 112 (109), 112 (128), 128 (129); IV-L-1–6: 94 (112), 105 (93), 107 (113), 128 (144), 143 (150), 137 (121).

Female (n = 1)

BODY. Body features same as for the male.

MEASUREMENTS. Idiosoma L 687, W 460. Dorsal shield L 558, W 418; dorsal plate L 512, frontal platelets L 120, shoulder platelets L 175. Infracapitular bay L 159; Cx-1 L 194, mL 89, Cx-II–III mL 105. Gf L 135, W 104, distance between Gf and Ap 125. Gnathosoma vL 330, dL 256, chelicera bs L 338, claw L 66. L of palp: P-1, 35; P-2, 127; P-3, 62; P-4, 118; P-5, 19. L of leg segments: I-L-1–6: 34, 83, 81, 95, 107, 95; II-L-1–6: 34, 54, 69, 93, 104, 96; III-L-1–6: 44, 58, 74, 107, 123, 122; IV-L-1–6: 105, 90, 110, 142, 150, 141.

Distribution

China (Wuyishan).

Habitat

Streamlet.

Remarks

The new species, Torrenticola suptilisrostrum sp. nov., is similar to T. fagei E. Angelier, 1949 ( Martin 2009) . The new species shares the character of an infracapitular rostrum extremely slender and slightly curved towards the dorsum with T. fagei . However, T. suptilisrostrum sp. nov. differs from the latter by E 4 on the same line with the 4 th pair of acetabula (5 th in T. fagei ); dorsal plate 2+2p+1 (dorsal plate 4+ 1 in T. fagei ); P-2 robust and compact (P-2 relatively thin and long in T. fagei ).

Figures

Fig. 1. Torrenticola suptilisrostrum Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180801). A. Dorsal view. B. Ventral view. C. Infracapitulum and chelicera. Scale bars = 100 μm.

Fig. 2. Torrenticola suptilisrostrum Gu & Guo sp. nov., ♂, holotype (FJ-TO-20180801). A. Palp, lateral view. B. leg-I. C. leg-II. D. leg-III. E. leg-IV. F. Ejaculatory complex. Scale bar = 100 μm.

Fig. 3. Torrenticola suptilisrostrum Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180803). A. Dorsal view. B. Ventral view. C. Infracapitulum and chelicera. Scale bars = 100 μm.

Fig. 4. Torrenticola suptilisrostrum Gu & Guo sp. nov., ♀, paratype (FJ-TO-20180803). A. Palp, lateral view. B. leg-I. C. leg-II. D. leg-III. E. leg-IV. Scale bar = 100 μm.