Tachycines (Gymnaeta) taenus, Zhu & Chen & Shi, 2020

Zhu, Qidi, Chen, Huiming & Shi, Fuming, 2020, Remarks on the genus Tachycines Adelung, 1902 (Orthoptera: Rhaphidophoridae Aemodogryllinae) with description of eight new species from caves in southern China, Zootaxa 4809 (1), pp. 71-94 : 82

7. Tachycines (Gymnaeta) taenus sp. nov.

( Figs. 8 , 16 O–P; Map 1)

Description. Male. Body slightly smaller than congeners. Fastigium verticis disappeared. Eyes distinctly reduced, white taenioid. Apical segment of maxillary palpus obviously longer than subapical one, apex inflated, globular.

Pronotum long, anterior margin of disc roughly straight, posterior margin rounded; lateral lobe longer than high, inferior margin arc-shaped. Mesonotum and metanotum slightly short, posterior margin of mesonotum rounded, that of metanotum straight.

Fore coxa and ventral surface of femur unarmed, internal genicular lobe with 1 small spine, external genicular lobe with 1 long spine; fore tibia only with 1 outer spine on ventral surface, apex with 1 pair of ventral spines, unarmed between the paired ventral spines. Middle femur unarmed on ventral surface, internal and external genicular lobes unarmed; middle tibia unarmed on ventral surface, apex with 1 pair of ventral spines, unarmed between the paired ventral spines. Hind femur unarmed on ventral surface, internal and external genicular lobes unarmed; hind tibia with 8–9 inner spines and 9–10 outer spines on dorsal surface, subapex with 1 pair of dorsal spines, apex with 1 pair of dorsal spines and 2 pairs of ventral spines, intero-dorsal spine distinctly shorter than hind basitarsus, which unarmed on dorsal surface, ventral surface with bristles.

Posterior margin of every abdominal tergite straight, abdominal sterna with conical tubercles, apices obtuse. Epiproct ligulate, apex rounded; paraproct simple, nearly triangular in lateral view. Cerci slender, conical, apices acute. Dorsal sclerite of genitalia quadrangular, with median longitudinal carina; apex of dorso-median lobe divided into 2 lobes, without obviously lateral sclerites; dorso-lateral lobes and ventro-lateral lobes nearly equal to dorsomedian lobe, ventro-median lobe rather short. Subgenital plate quadrangular, posterior margin slightly narrow, truncate.

Female. Appearance is similar to male. Ovipositor longer than half of hind femur, curved upwards, dorsal margin smooth, apical areas of ventral margin denticulate. Subgenital plate triangular, apex acute.

Coloration. Body uniformly yellowish.

Material examined. Holotype: male, Gan Cave, Quishang Tun , Xinyan Village , Donglan County, Guangxi, 2 February, 2017, coll. Huiming Chen. Paratype: 1 female, same collection data as for holotype .

Measurements (mm). Body: ♂ 14.8, ♀ 12.8; pronotum: ♂ 4.0, ♀ 4.0; fore femur: ♂ 10.0, ♀ 10.2; hind femur: ♂ 17.2, ♀ 16.8; hind tibia: ♂ 19.5, ♀ 20.0; hind basitarsus: ♂ 4.0, ♀ 3.8; ovipositor: 11.0.

Distribution. China (Guangxi).

Etymology. The name of the new species refers to eyes distinctly reduced, white taenioid, Greek taen- means taenioid.

Discussion. Male genitalia of the new species is mostly related to Tachycines (Gymnaeta) crenata ( Gorochov, Rampini & Di Russo, 2006) , but it can be distinguished by: fastigium verticis disappeared, eyes distinctly reduced, white taenioid; hind tibia with 8–9 inner spines and 9–10 outer spines on dorsal surface; dorsal sclerite of male genitalia quadrangular, with median longitudinal carina.

Figures

FIGURE 8. Tachycines (Gymnaeta) taenus sp. nov., male: A–C. head and pronotum: A. frontal view, B. lateral view, C. dorsal view; D–F. apex of abdomen: D. lateral view, E. dorsal view, F. subgenital plate in ventral view; I. hind basitarsus in lateral view; female: G. subgenital plate in ventral view; H. ovipositor in lateral view.

FIGURE 16. Male genitalia. A, D, G, I, K, M, O: dorsal view; B, E, H, J, L, N, P: ventral view; C: lateral view; F: apical view: A–C. Tachycines (Gymnaeta) liboensis sp. nov.; D–F. Tachycines (Gymnaeta) umbellus sp. nov.; G–H. Tachycines (Gymnaeta) bifolius sp. nov.; I–J. Tachycines (Gymnaeta) tuberus sp. nov.; K–L. Tachycines (Gymnaeta) paradoxus sp. nov.; M–N. Tachycines (Gymnaeta) nulliscleritus sp. nov.; O–P. Tachycines (Gymnaeta) taenus sp. nov.