Tachycines (Gymnaeta) latiliconcavus, 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 : 83-85

8. Tachycines (Gymnaeta) latiliconcavus sp. nov.

( Figs. 9–10 , 17 A–B; Map 1)

Description. Male. Body slightly smaller than other congeneric species. Fastigium verticis short, conical, apices obtusely rounded. Eyes oval, protruding forwards; median ocellus oval, indistinct, located between antennal sockets; lateral ocelli circular, situated on lateral margins of basal fastigium verticis. Apical segment of maxillary palpus distinctly longer than subapical one, apex inflated, globular.

Pronotum long, 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 with 1 small spine, external genicular lobe with 1 long spine; fore tibia with 1 inner spine and 2 outer spines on ventral surface, apex with 1 externo-dorsal spine and 1 pair of ventral spines, 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; apex of middle tibia 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, internal and external genicular lobe with 1 small spine respectively; hind tibia with 82–87 inner spines and 77–87 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, which with 1 dorsal spine, ventral surface without bristles.

Posterior margin of every abdominal tergite straight. Epiproct ligulate, apex rounded; paraproct simple, nearly triangular in lateral view. Cerci slender, conical, apices acute. Dorsal sclerite of genitalia broad, basal half rectangular, apical half with 1 wide concavity; apex of dorso-median lobe with 2 lobes, lateral sclerites small, oval, reaching subapex of dorso-median lobe; dorso-lateral lobes nearly equal to dorso-median lobe, ventro-lateral lobes slightly short, ventro-median lobe extremely short. Subgenital plate quadrangular, posterior margin slightly narrow, truncate.

Female. Appearance is similar to male. Ovipositor shorter than half of hind femur, slightly curved upwards, dorsal margin smooth, apical areas of ventral margin denticulate. Subgenital plate trapezoidal, posterior margin slightly convex.

Coloration. Body yellowish-brown. Eyes black, ocelli yellow.

Material examined. Holotype: male, Longmen Cave, Longmen Village , Lushan County, Sichuan, 1 November, 2015, coll. Huiming Chen. Paratypes: 3 males and 1 female, same collection data as for holotype .

Measurements (mm). Body: ♂ 15.0–16.6, ♀ 14.2; pronotum: ♂ 4.8–5.0, ♀ 4.6; fore femur: ♂ 11.2–11.5, ♀ 11.0; hind femur: ♂ 19.6–21.0, ♀ 20.0; hind tibia: ♂ 22.0–24.8, ♀ 21.0; hind basitarsus: ♂ 4.6–4.8, ♀ 4.5; ovipositor: 9.6.

Distribution. China (Sichuan).

Etymology. The name of the new species refers to apical half of dorsal sclerite of male genitalia with 1 wide concavity, Latin latil- means wide, with Latinization concav- means concavity.

Discussion. The new species is distinguished from congeneric species by: dorsal sclerite of male genitalia broad, basal half rectangular, apical half with 1 wide concavity; lateral sclerites of dorso-median lobe small, oval, reaching subapex of dorso-median lobe; dorso-lateral lobes nearly equal to dorso-median lobe.

Figures

FIGURE 9. Tachycines (Gymnaeta) latiliconcavus 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 10. Habitus of Tachycines (Gymnaeta) latiliconcavus sp. nov. A. male; B. nymph of female.

FIGURE 17. Male genitalia.A, C, E, G, I, K: dorsal view; B, D, F, H, J, L: ventral view:A–B. Tachycines (Gymnaeta) latiliconcavus sp. nov.; C–D. Tachycines (Gymnaeta) cavernus (Jiao, Niu, Liu, Lei & Bi, 2008); E–F. Tachycines (Gymnaeta) chenhui (Rampini & Di Russo, 2008); G–H. Tachycines (Gymnaeta) ferecaecus (Gorochov, Rampini & Di Russo, 2006); I–J. Tachycines (Gymnaeta) proximus (Gorochov, Rampini & Di Russo, 2006); K–L. Tachycines (Gymnaeta) zorzini (Rampini & Di Russo, 2008).