Tachycines (Gymnaeta) shanduensis, 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) shanduensis sp. nov.

Figs 6A-D , 15

Specimens examined.

Holotype 1♂, Shuilong Cave , Sandu County, 2019-VII-22, collected by Xulin Zhou, Benchang Shi, Changzhen Zheng, Gui Liang, Haixia Luo, Hailian Lan, Juan Liao; paratypes, 6♂, 8♀, same data as holotype.

Diagnosis.

This species is rather similar to Tachycines (Gymnaeta) solida (Gorochov, Rampini & Di Russso, 2006) and Tachycines (Gymnaeta) tongrenus Feng, Huang & Luo, 2020, but the male epiphallus of the new species has a distal shallow notch clearly wider than the upper notch, the median process of the male genitalia is significantly longer than the lateral sclerites, hind tibiae dorsally on both sides with 34-46 spines, hind tarsus keeled beneath; however, in Tachycines (Gymnaeta) solida , the male epiphallus has the upper and lower notches almost the same size, hind tibiae dorsally on both sides with 62-69 spines; in Tachycines (Gymnaeta) tongrenus , the hind tibia dorsally with 48-49 inner spines and 54-56 outer spines, hind tarsus with bristles ventrally.

Description.

Male. Body rather large for this subgenus. Vertex conical tubercles are well developed, bisected from the base; ommateum is black and well developed (Fig. 6A ). Legs elongate and slender; fore femur approx. 1.9-2.1 times longer than the pronotum, ventrally unarmed, external genicular lobe with one elongate movable spur, internal knee lobe with a small 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 one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae dorsally with 34-43 internal spines and 38-46 external spines, arranged in groups. Supra-internal spur of hind tibiae shorter than the dorsal apex of hind tarsus. Hind tarsus keeled ventrally, with one dorsal apical spine. Epiphallus of male genitalia nearly H-shaped, lateral sclerites distinctly long and narrow, upper notch rather smaller than lower notch.

Female. Appearance is similar to male (Fig. 6B ). Subgenital plate with three lobes, median lobe large, triangular, and apical area sharp (Fig. 6C ). Ovipositor is shorter than half of the hind femur length, dorsal margin smooth, apical area of ventral margin denticulate.

Coloration.

Body dark brown, mixed with tawny stripes, hind femur with brown diagonal stripe.

Measurements

(mm). Body ♂ 17.3-19.5, ♀17.3.0-19.6; pronotum ♂ 6.8-7.6, ♀ 66-7.3; fore femur ♂ 13.3-15.1, ♀ 13.8-14.6; hind femur ♂ 28.5-31.9, ♀ 28.4-30.7; ovipositor 12.8-13.5.

Distribution of light zone.

Light zone, weak light zone, and dark light zone.

Cave adaptation type.

Troglophile.

Etymology.

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

Figures

Figure 6. Tachycines (Gymnaeta) shanduensis sp. nov., A male live habitus in dorsal view B female live habitus in dorsal view C female subgenital plate in ventral view D male genitalia in dorsal view.

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