Tachycines (Gymnaeta) trapezialis,

Zhou, Xulin & Yang, Weicheng, 2020, A new species of Tachycines Adelung, 1902 (Orthoptera, Rhaphidophoridae, Aemodogryllinae, Aemodogryllini) from karst caves in Guizhou, China, ZooKeys 937, pp. 21-29: 21

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Tachycines (Gymnaeta) trapezialis

sp. nov.

Tachycines (Gymnaeta) trapezialis  sp. nov. Figures 1View Figure 1, 2View Figure 2, 3View Figure 3, 4View Figure 4, 5View Figure 5, 6View Figure 6


This new species is very similar to T. (G.) lushuicus  Qin, Liu & Li, 2019, T. (G.) parvus  Qin, Liu & Li, 2019, and T. (G.) bifurcatus  Gorochov, 2010, but differs from them in having the epiphallus of the male genitalia trapezoidal, without upper and lower deep notches and the hind tibia provided with 54-60 spines on each side for the new species. In T. (G.) lushuicus  Qin, Liu & Li, 2019, the epiphallus of the male genitalia has an upper deep notch, and the hind tibia above has 61-67 spines on each side. In T. (G.) parvus  Qin, Liu & Li, 2019, the epiphallus of the male genitalia has an upper and lower deep notch, and the female subgenital plate is triangular. In T. (G.) bifurcatus  Gorochov, 2010, the epiphallus is strongly transverse, with a slightly notched upper part and medial projections on the lower part, and with a pair of large, almost oval lateral sclerites in males.

Type locality.

Holotype, 1♂, Diaosiyan Cave, Ziyun County, Guizhou, 25°35.06'N, 106°12.32'E, 1110-1120 m alt., October 2, 2019, collected by Xulin Zhou; paratypes, 1♀, same data as holotype.

Specimens examined.

Diaosiyan Cave, Ziyun County, Guizhou Province: nymphs 11♂♂ 10♀♀, June 10, 2019, collected by Xulin Zhou, Juan Liao and Yi Du; 13♂♂ 9♀♀, October 2, 2019, collected by Xulin Zhou, Haixia Luo, Panpan Ren, Meizhen Deng and Suqin Zhao. Sanjiaoshan Cave, Ziyun County, Guizhou Province: 2♀♀, 25°35.35'N, 106°12.31'E, 1109m alt., October 2, 2019, collected by Xulin Zhou, Haixia Luo, Panpan Ren, Meizhen Deng and Suqin Zhao.


Male. Body medium-sized (Fig. 5View Figure 5). Vertex divided into two conical tubercles (Fig. 1A, BView Figure 1). Ommateum normal, not reduced; ocelli visible. Legs elongate and slender; fore femur about 1.6-1.8 times longer than the pronotum, ventrally unarmed, internal genicular lobe with a small spine; external genicular lobe with one elongate movable spur; ventral side of fore tibiae with two external spurs and two internal spurs. Mid femur ventrally unarmed, internal, and external genicular lobes with one elongate movable spur respectively; ventral side of mid tibiae with one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae with 55-60 outer spines and 54-58 inner spines, arranged in groups. Supra-internal spurs of hind tibiae not exceeding ventral apex of hind tarsus (Fig. 1CView Figure 1). Hind tarsus keeled ventrally and with one dorsal apical spine. Male genitalia with trapezoidal epiphallus, lateral sclerites and median process divided at apical fourth (Figs 2A, BView Figure 2, 3A, BView Figure 3).

Female. Other characters are similar to male (Fig. 6View Figure 6). Subgenital plate wider than long and with three lobes; median lobe large and nearly trapezoid with apex transverse, paired lateral lobes small and nearly triangular with blunt apex (Fig. 1DView Figure 1). Ovipositor (Fig. 1EView Figure 1) shorter than half the length of hind femur.


Body brown. Frons with two dark longitudinal bands (Fig. 1AView Figure 1). Pronotum and mesonotum margins dark brown. Apexes of abdominal tergites dark brown. Hind femur with darkish stripes laterally.

Measurements (mm).

Body ♂16.2-17.6, ♀14.8-17.9; pronotum ♂6.3-6.6, ♀6.1-6.4; fore femur ♂10.8-11.3, ♀10.3-113; hind femur ♂16.3-17.6, ♀21.1-22.4; ovipositor 8.1-9.2.


The name refers to trapezoidal epiphallus in males.


Individuals of the new species live in groups in subtropical karst caves (Figs 4View Figure 4, 7View Figure 7).


Guizhou, China.