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

Figs 9A-E , 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♂, 38♀, same data as holotype.

Diagnosis.

The new species is rather similar to Tachycines (Gymnaeta) shibenzhangi sp. nov., it can easily be distinguished by the eyes moderately reduced, ventral conical projections of 3rd-8th abdominal sternites developed, distal mucronate without ciliated; but the latter of eyes extremely reduce, ventral conical projections of 3rd-8th abdominal sternites developed, distal obtuse and densely ciliated.

Description.

Male. Body medium size (Fig. 9D, E ). Vertex conical tubercles almost absent, ommateum moderately reduced. Legs elongate and slender; fore femur approx. 2.5-3.1 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 one external spur and one internal spur. Mid femur with an elongate movable spur on both internal and external genicular lobe, ventrally unarmed; mid tibiae beneath without internal and external spur. Hind femur without spines ventrally; hind tibiae dorsally with 9-15 internal spines and 9-13 external spines, sparsely arranged, supra-internal spur of hind tibiae not exceeding the ventral apex of hind tarsus. Hind tarsus ventrally with bristles (Fig. 9C ). ventral conical projections of 3rd-8th abdominal sternites developed, distal 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. 9A, B ).

Female. Appearance is similar to the male. Subgenital plate with three lobes, median lobe large, triangular; ovipositor is slightly longer than half of the hind femur length.

Coloration.

The body color is yellowish, face without dark brown stripes, uniformly pale yellow, ventral conical projections of abdominal sternites shiny white. Ovipositor is brownish yellow.

Measurements

(mm). Body ♂11.4-12.8, ♀12.2-13.2, pronotum ♂ 3.5-4.3, ♀ 3.9-4.3, fore femur ♂ 11.0-12.1, ♀ 10.2-10.8, hind femur ♂ 17.9-19.2, ♀ 16.9-17.9; ovipositor 8.9-10.3.

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 9. Tachycines (Gymnaeta) ziyunensis sp. nov., A male genitalia in dorsal view B male genitalia in ventral view C hind tarsus in lateral view D male live habitus in dorsal view E nymph of male, living habitus in dorsal view.

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