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

Figs 5A-D , 15

Specimens examined.

Holotype 1♂, Lagaobieran Dong , Pinglang Town, Duyun City, 2015-VII-25, collected by Qing Wen; paratypes, 11♂, 16♀, 2015-VII-25, collected by Qing Wen, Dongshan Xu, Yi Luo, Yuanchan Yu, Guang Zhang.

Diagnosis.

The new species is very similar to Tachycines (Gymnaeta) ferecaecus (Gorochov, Rampini & Di Russo, 2006): both species have a nearly quadrate-shaped epiphallus, but the new species can be distinguished from the latter by the absence of an ommateum (without any black facets), only the base of the ommateum was faintly visible.

Description.

Male. Body medium sized in the subgenus (Fig. 5A ). Vertex conical tubercles almost absent, ommateum completely reduced (appears to be without any black facets, only ommateum base); Legs elongate and slender; fore femur approx. 2.8-3.2 times longer than the pronotum, ventrally unarmed, external genicular lobe with one elongate movable spur, internal knee lobe without spine; fore tibiae beneath with one external spur (sometimes with two external spurs), but without internal spur. Mid femur with an elongate movable spur on the internal and external genicular lobes, ventrally unarmed; mid tibiae ventrally with one external spur and one internal spur. Hind femur without spines ventrally; hind tibiae dorsally with 12-15 internal spines and 12 or 13 external spines, sparsely arranged. Supra-internal spur of hind tibiae shorter than the ventral apex of hind tarsus. Hind tarsus with bristles ventrally. Ventral conical projections of 3rd-8th abdominal sternites developed, distally obtuse, and densely ciliated. Epiphallus of male genitalia nearly quadrate, median lobe of genitalia with a pair of wide apical lobules, but without distinct lateral sclerites (Fig. 5B ).

Female. Appearance is similar to the male. The subgenital plate is nearly triangular, and the apical area slightly obtuse. Ovipositor is longer than half of the hind femur length, brown, dorsal margin smooth, apical area of ventral margin denticulate, bent slightly upwards.

Coloration.

Body yellowish brown, ovipositor wheat.

Measurements

(mm). Body ♂ 9.5-13.0, ♀ 8.2-12.0; pronotum ♂ 3.2-3.8,♀ 3.2-3.4; fore femur ♂ 10.2-10.50, ♀ 10.2-10.4; hind femur ♂ 13.2-14.7, ♀ 13.2-14.6; ovipositor 8.0-10.4.

Distribution of light zone.

Dark light zone.

Cave adaptation type.

Troglobite.

Etymology.

The specific epithet refers to the locality where the type specimens were collected.

Figures

Figure 5. Tachycines (Gymnaeta) pinglangus sp. nov., A male body in lateral view B male genitalia in dorsal view C female terminal in lateral view D female subgenital plate in ventral view.

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