Tachycines (Gymnaeta) jialiangensis, Zhou & Yang, 2022

Zhou, Xulin & Yang, Weicheng, 2022, Ten new species of genus Tachycines (Orthoptera, Rhaphidophoridae, Aemodogryllinae) from karst caves in Guizhou, China, ZooKeys 1109, pp. 115-140 : 115

Tachycines (Gymnaeta) jialiangensis sp. nov.

Figs 10A-C , 15

Specimens examined.

Holotype 1♂, Lajilou Cave , Jialiang Town, Libo County, 2017-X-23, collected by Xulin Zhou, Dongshan Xu, Weicheng Yang; paratypes, 4♂, 2♀, same data as holotype.

Diagnosis.

This species is similar to T. (G.) ziyunensis sp. nov. but differs in that the hind tarsus ventrally bears bristles in T. (G.) ziyunensis sp. nov., and by the hind tibiae armed with 9-15 spines on both sides; however, the hind tarsus is keeled ventrally in T. (G.) jialiangensis sp. nov., and the hind tibiae are provided with 17-25 spines on both sides.

Description.

Male. Body medium in size. Vertex conical tubercles almost absent, ommateum moderately reduced. Legs elongate and slender; fore femur 2.9-3.0 times longer than the pronotum, ventrally unarmed, external genicular lobe with single elongate movable spur, internal knee lobe without spine; fore tibiae beneath with two external spurs and one internal spur. Mid femur with an elongate movable spur on both internal and external genicular lobes, ventrally unarmed; mid tibiae beneath with an external spur and without internal spur. Hind femur without spines ventrally; hind tibiae dorsally with 18-25 internal spines and 17 or 18 external spines, sparsely arranged. Supra-internal spur of hind tibiae not exceeding ventral apex of hind tarsus. Hind tarsus keeled ventrally (Fig. 10C ). ventral conical projections of 3rd-8th abdominal sternites developed, distally mucronate without cilia. Epiphallus of male genitalia nearly semi-circular, lateral sclerites sub-elliptical, median process of male genitalia with semi-sclerotized lobules at apical part and divided into two lobes, significantly longer than lateral sclerites (Fig. 10A, B ).

Female. Appearance is similar to the male. Subgenital plate with three lobes, median lobe large, triangular; ovipositor slightly shorter than half of the hind femur length, dorsal margin smooth, apical area of ventral margin denticulate.

Coloration.

Body color uniform, pale yellow; face without dark brown stripes; ventral conical projections of 3rd-8th abdominal sternites shiny white.

Measurements

(mm). Body ♂ 11.8-12.0, ♀ 11.2-13.0; pronotum ♂ 3.5-3.6, ♀ 3.4-4.2; fore femur ♂ 10.3-10.6, ♀10.4-13.2; hind femur ♂17.5-18.4, ♀17.1-21.66, ovipositor 8.3-9.9.

Distribution of light zone.

Dark light zone.

Cave adaptation type.

Troglobite.

Etymology.

The name of the new species refers to the type locality.

Figures

Figure 10. Tachycines (Gymnaeta) jialiangensis sp. nov., A male genitalia in dorsal view B male genitalia in ventral view C hind tarsus in lateral view.

Figure 15. Distribution map for new species of subgenus Tachycines Gymnaeta from Guizhou mentioned in this study.