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

Figs 4A-D , 15

Specimens examined.

Holotype, 1♂, Lahaide Dong , Pinglang Town, Duyun City, 2015-VII-24, collected by Qing Wen, Dongshan Xu, Yuanchan Yu, Yi Luo, Guang Zhang; paratypes, 6♂, 8♀, same data as the holotype.

Diagnosis.

The new species is very similar to Tachycines (Gymnaeta) shibenzhangi sp. nov., as both species have an arc-shaped epiphallus. The difference is that the ventral surface of the hind tarsus keeled in the new species, but differs from the latter in that: lower notch of the epiphallus is rather small, hind tarsus keeled beneath, epiphallus of male nearly n-shaped; ventral conical projections of 3rd-8th abdominal sternites developed, apex mucronate without dense cilia.

Description.

Male. Body medium sized. Vertex conical tubercles inconspicuous, eyes moderately reduced, approx. 1/2 the size of the normal eye. Legs elongate, slender; fore femur approx. 2.1-2.5 times longer than the pronotum, ventrally unarmed, external genicular lobe with one elongated movable spur, internal knee lobe without spine; fore tibiae ventrally with two external spurs and one internal spur. Mid femur with an elongate movable spur on the internal and external genicular lobes, ventrally unarmed; mid tibiae beneath with one external spur and one internal spur. Hind femur without spine ventrally; hind tibiae dorsally with 27-30 internal spines and 22-26 external spines, sparsely arranged. Supra-internal spur of hind tibiae not exceeding the ventral apex of hind tarsus. Hind tarsus keeled ventrally. Ventral conical projections of 3rd-8th abdominal sternites developed, distally mucronate without cilia. Epiphallus of male genitalia nearly n-shaped, lateral sclerites distinctly long and narrow.

Female. Appearance is similar to the male. The subgenital plate is nearly triangular, its apical area slight obtuse (Fig. 4D ). Ovipositor is longer than half length of the hind femur, dorsal margin smooth, apical area of ventral margin denticulate, bent slightly upwards.

Coloration.

Body brown, ovipositor wheat.

Measurements

(mm). Body ♂ 10.5-12.3, ♀ 11.2-12.6; pronotum ♂ 4.0-4.8, ♀ 3.8-3.9; fore femur ♂ 10.2-10.30, ♀ 10.1-10.3; hind femur ♂ 18.9-19.0, ♀ 18.0-18.1; ovipositor 10.0-11.0.

Distribution of light zone.

Dark light zone.

Cave adaptation type.

Troglobite.

Etymology.

The specific epithet refers to the Lahaide cave.

Figures

Figure 4. Tachycines (Gymnaeta) lahaidensis sp. nov., A male body in lateral view B male genitalia in dorsal view C hind tarsus 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.