Tachycines (Gymnaeta) tuberus, 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 : 75-77

3. Tachycines (Gymnaeta) tuberus sp. nov.

( Figs. 3 , 16 I–J; Map 1)

Description. Male. Body mediun-sized. Fastigium verticis disappeared. Eyes moderately reduced, crescent. Apical segment of maxillary palpus distinctly longer than subapical one, apex inflated, globular.

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

Fore coxa with 1 small spine; fore femur unarmed on ventral surface, internal genicular lobe stingless, external genicular lobe with 1 long spine; fore tibia with only 2 outer spines on ventral surface, apex with 1 outer spine on dorsal surface and 1 pair of spines on ventral surface, between the paired ventral spines with 1 small spine. Middle femur unarmed on ventral surface, internal and external genicular lobes with 1 long spine respectively; middle tibia unarmed on ventral surface, apex with 1 pair of dorsal spines and 1 pair of ventral spines, between the paired ventral spines with 1 small spine. Hind femur unarmed on ventral surface; hind tibia with 21–24 inner spines and 18–21 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 obviously shorter than hind basitarsus. Dorsal surface of hind basitarsus unarmed.

Posterior margin of every abdominal tergite straight, abdominal sterna with distinctly conical tubercles. Epiproct ligulate, paraproct simple. Cerci slender, conical, apices acute. Dorsal sclerite of genitalia nearly rectangular, apical area with 1 broad concavity; lateral sclerites of dorso-median lobe slightly narrow, reaching subapex of dorso-median lobe, apical area with 1 pair of small lobes; dorsal and ventral lateral lobes nearly equal to dorso-median lobe. Subgenital plate quadrangular, transverse and broad, posterior margin slightly concave.

Female. Appearance is similar to male. Ovipositor rather long, distinctly longer than half of hind femur, dorsal margin smooth, apical area of ventral margin denticulate. Subgenital plate nearly triangular.

Coloration. Body color uniform, yellow.

Material examined. Holotype: male, Zhuanwan Cave, Sanglang Town , Wangmo County, Guizhou, 29 December, 2010, coll. Huiming Chen. Paratypes: 1 male and 2 females, same collection data as for holotype .

Measurements (mm). Body: ♂ 13.0–15.0, ♀ 13.0–13.5; pronotum: ♂ 4.0–4.1, ♀ 3.6–4.0; fore femur: ♂ 10.8– 11.0, ♀ 10.8–11.0; hind femur: ♂ 19.0–19.8, ♀ 18.0–19.0; hind tibia: ♂ 21.2–22.0, ♀ 20.0–21.0; hind basitarsus: ♂ 3.0–3.2, ♀ 2.6–3.0; ovipositor: 13.2–13.5

Distribution. China (Guizhou).

Etymology. The name of the new species refers to male abdominal sterna with distinctly conical tubercles, Latin tuber- means tubercle.

Discussion. The new species can be distinguished from congeneric species by: the shape of male genitalia, male abdominal sterna with distinctly conical tubercles, fastigium verticis disappeared, eyes moderately reduced.

Figures

FIGURE 3. Tachycines (Gymnaeta) tuberus 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. apico-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.