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

Figs 7A-C , 15

Specimens examined.

Holotype 1♂, Sanjiaoshan Cave , Ziyun County, 2019-X-2, collected by Xulin Zhou, Haixia Luo, Panpan Ren, Meizhen Deng and Suqin Zhao; paratypes, ♂ 15, ♀ 18, same data as holotype.

Diagnosis.

This new species is rather similar to Tachycines (Gymnaeta) solida (Gorochov, Rampini & Di Russo, 2006), but differs as follows: the new species epiphallus of male genitalia with upper notch smaller and shallower than lower notch, hind tarsus ventrally with bristles; in T. (G.) solida the epiphallus of the male genitalia with upper notch and lower notch almost the same size, hind tarsus keeled ventrally.

Description. Male. Body rather small for this subgenus. Vertex conical tubercles well-developed, bisected from the base; ommateum black and well developed. Legs elongate and slender; fore femur 2.0-2.1 times longer than the pronotum, ventrally unarmed, external genicular lobe with one 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 one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae dorsally with 35-44 internal spines and 36-46 external spines, arranged in groups. Supra-internal spur of hind tibiae not exceeding the ventral apex of hind tarsus. Hind tarsus ventrally with bristles. Epiphallus of male genitalia nearly H-shaped, lower notch rather deeper than upper notch (Fig. 7A, B ).

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

Coloration.

Body brown, mixed with dark brown patches. Hind femur with brown stripe, and dark brown rings located at 2/3 of the length.

Measurements

(mm). Body ♂10.5-11.3, ♀10.8-11.5; pronotum ♂3.9-4.5, ♀4.1-4.6; fore femur ♂ 8.3-8.9, ♀ 8.4-9.3; hind femur ♂ 14.7-16.5, ♀ 15.3-17.8; ovipositor 7.2-8.6.

Distribution of light zone.

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

Cave adaptation type.

Troglophiles.

Etymology.

The specific epithet refers to the native BuYi people who have lived in southern Guizhou for generations.

Figures

Figure 7. Tachycines (Gymnaeta) buyii sp. nov., A male genitalia in dorsal view B male genitalia in ventral view C female subgenital plate in ventral view.

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