Torrenticola (Torrenticola) gladiusirostrum Jia, Gu & Guo, 2023

Jia, Lan, Gu, Xinyao, Jin, Daochao & Guo, Jianjun, 2023, A newly recorded and a new species of torrenticolid mites (Acari: Hydrachnidiae) from China, Zoological Systematics 48 (1), pp. 100-105 : 101-102

Torrenticola (Torrenticola) gladiusirostrum Jia, Gu & Guo , sp. nov. ( Figs 1–2 )

Diagnosis. The species is characteristic by: Dorsal plate arrangement 2+1. Infracapitular bay U-shaped, deep and wide, V 2 almost at same level of Ap. Gnathosoma ventral apodeme short and blunt, rostrum flattened and sword-shaped. P-2 and P-3 with ventral processes pointed and smooth, and P-2 with ventral process curved upwards, P-4 with two ventral apodemes.

Description. Female (n = 2). Idiosoma elliptical and flattened, with brownish green color ( Fig. 1A ). Dorsal plate arrangement 2+1, L 807 (818), W 548 (562), L/W ratio 1.47 (1.46) ( Fig. 1A ). Dorsal plate Ⅰ long rectangular, L 114 (121), W 53 (59), L/W ratio 2.2 (2.1); dorsal plate II fused with dorsal shield, traces remained, with O 2 and D 1 ( Fig. 1A ). Dorsal shield L 620 (625), W 464 (472), L/W ratio 1.3 (1.3) ( Fig. 1A ). Infracapitular bay U-shaped, deep and wide, L 171 (189), W 78 (82), L/W ratio 2.2 (2.3) ( Fig. 1B ). Cx-Ⅰ mL 114 (127), Cx-II–III mL 78 (82); L 2 without epidermal protrusion. Posterior margin of Cx-IV distinct, E 4 flush with acetabula pair IV ( Fig. 1B ). V 1 posterior to Cx-IV, V 2 almost at same level of Ap ( Fig. 1B ). Genital field approximately pentagonal, L 156 (166), W 160 (165) ( Fig. 1B ). Distance between Gf and Ap 171 (184). Gnathosoma dL 291 (289), vL 365 (378), ventral apodeme short and blunt, rostrum elongated, flattened and sword-shaped ( Fig. 1D ), and tip of dorsal apodeme pointed. Chelicera bs L 193 (201), claw L 46 (52). Palp ( Fig. 1C ): P-1 with one short dorsal seta; P-2 with five dorsal setae, and only one seta located almost at base of ventral process; P-3 with two dorsal setae and one ventral seta; P-2 and P-3 with ventral processes pointed and smooth, and ventral process of P-2 curved upwards; P- 4 with two ventral extensions, which clearly separated, and with 3 fine setae on them; P-5 short and small. L of palp segments ( Fig. 1C ): P-1, 42 (46); P-2, 116 (121); P-3, 76 (82); P-4, 97 (103); P-5, 21 (19). L of leg s ( Fig. 2 ). I-L-1–6: 34 (38), 69 (72), 78 (84), 97 (104), 103 (108), 87 (93); II-L-1–6: 34 (41), 78 (82), 70 (74), 91 (99), 106 (112), 113 (122); III-L-1–6: 42 (48), 83 (89), 78 (82), 106 (118), 126 (135), 127 (141); IV-L-1–6: 104 (118), 98 (104), 112 (122), 147 (162), 155 (168), 147 (157).

Male. Unknown.

Material examined. Holotype ♀, No. AH-TO-2010052001, Hougu Scenic Area , Tangkou, Huangshan, Anhui, China (30°19′14′′N, 118°86′27′′E, elev. 890 m), 20.V.2010, coll. Xu Zhang. Paratype. 0/1/0, No. AH-TO-2010052002, same data as holotype .

Habitat. Running water; with many rocks on the bed, and no water plants.

Distribution. China (Anhui).

Etymology. This new species is named after its flattened, sword-shaped rostrum, “ gladius” means sword-like, and “ rostrum ” means gnathosomal rostrum.

Remarks. The new species is similar to T. acrisarostrum Gu & Guo, 2020 for the ventral processes at P-2 and P-3 and respectively with a seta, the short and sharp dorsal apodeme of the gnathosoma, and the thin and pointed rostrum (Gu et al., 2020), butdifferent from the latter by: (1) E 4 flush with the acetabula pair IV (vs. the acetabula pair II in T. acrisarostrum); (2) The ventral apodeme of the gnathosoma short and blunt (vs. relatively long and sharp in T. acrisarostrum); (3) P-4 with two ventral extensions (vs. only one in T. acrisarostrum).

Figures

Figure 1. Torrenticola (Torrenticola) gladiusirostrum sp. nov., female. A. Dorsal view; B. Ventral view; C. Palp; D. Infracapitulum and chelicera. Scale bars=100μm.

Figure 2. Torrenticola (Torrenticola) gladiusirostrum sp. nov., female. A. Leg-I; B. Leg-II; C. Leg-III-3–6; D. Leg-IV-1–4; E. Leg- IV-5–6. Scale bars=100μm.