Tachycines (Gymnaeta) umbellus, 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 : 79-80

5. Tachycines (Gymnaeta) umbellus sp. nov.

( Figs. 6 , 16 D–F, 18 C; Map 1)

Description. Male. Body slightly smaller than other congeneric species. Fastigium verticis disappeared. Eyes kidney-shaped, slightly reduced. 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 unarmed, external genicular lobe with 1 long spine; fore tibia only with 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 with 1 inner spine and 1 outer spine on ventral surface, apex with 1 intero-dorsal spine 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 lobes unarmed; hind tibia with 22–29 inner spines and 18–19 outer spines on dorsal surface, subapex with 1 inner spine on dorsal surface, 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, upper part of membrane between the first and the second abdominal tergites black, abdominal sterna with distinctly conical tubercles. Epiproct ligulate, apex rounded; paraproct simple, nearly triangular. Cerci slender, conical, apices acute. Dorsal sclerite of genitalia quadrangular, narrow, medium area constricted; the middle of dorso-median lobe with inverted umbrella-shaped sclerite in apical view, apex curved downwards; dorso-median lobe with indistinctly lateral sclerites; dorso-lateral lobes slightly longer than dorso-median lobe, ventro-lateral lobes rather short. Subgenital plate quadrangular, transverse and broad, posterior margin slightly concave.

Female. Appearance is similar to male, without blackish membrane between the first and the second abdominal tergites. Ovipositor nearly equal to half of hind femur, curved upwards, dorsal margin smooth, apical areas of ventral margin denticulate. Subgenital plate nearly triangular, without distinctly tubercle.

Coloration. Body uniformly yellowish. Eyes black, upper part of membrane between the first and the second male abdominal tergites black.

Material examined. Holotype: male, Xianhua Cave , Suoxiyu, Zhangjiajie City, Hunan, 6 May, 2009, coll. Huiming Chen. Paratypes: 1 male and 2 females, same collection data as for holotype .

Measurements (mm). Body: ♂ 11.8–13.0, ♀ 11.8–12.0; pronotum: ♂ 3.1–3.6, ♀ 3.0–3.2; fore femur: ♂ 10.0– 11.2, ♀ 9.8–10.0; hind femur: ♂ 16.0–16.2, ♀ 15.8–16.0; hind tibia: ♂ 19.0–19.8, ♀ 17.5–17.8; hind basitarsus: ♂ 3.0– 3.2, ♀ 2.9–3.0; ovipositor: 9.8–10.0.

Distribution. China (Hunan).

Etymology. The name of the new species refers to the middle of dorso-median lobe of male genitalia with inverted umbrella-shaped sclerite in apical view, Latin umbell- means umbrella-shaped.

Discussion. The new species is similar to Tachycines (Gymnaeta) crenata ( Gorochov, Rampini & Di Russo, 2006) , it differs from the latter by: fore tibia only with 2 outer spines on ventral surface, middle tibia with 1 inner spine and 1 outer spine on ventral surface; dorsal sclerite of male genitalia quadrangular, narrow, medium area constricted; the middle of dorso-median lobe with inverted umbrella-shaped sclerite in apical view, apex curved downwards; dorso-median lobe with indistinctly lateral sclerites.

Figures

FIGURE 6. Tachycines (Gymnaeta) umbellus sp. nov., male: A–B, D. head and pronotum: A. frontal view, B. lateral view, D. dorsal view; C, E–G. abdomen: C. lateral view, E–F. dorsal view, G. subgenital plate in ventral view; J. hind basitarsus in lateral view; female: H. subgenital plate in ventral view; I. 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.