Tachycines (Gymnaeta) paradoxus, 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 : 77-79

4. Tachycines (Gymnaeta) paradoxus sp. nov.

( Figs. 4–5 , 16 K–L; Map 1)

Description. Male. Body medium-sized. Fastigium verticis short, conical, apices blunt, directing forwards. Eyes oval, protruding forwards; median ocellus oval, located between antennal sockets; lateral ocelli nearly circular, situated on lateral margins of basal fastigium verticis. Apical segment of maxillary palpus distinctly longer than subapical one, apex inflated, globular.

Pronotum broad, anterior margin of disc roughly straight, posterior margin rounded; lateral lobe longer than high, ventral margin arc-shaped. Mesonotum and metanotum slightly short, posterior margin of mesonotum round- ed, 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 spines and 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; tibia with 1 inner spine and 1 outer spine 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, internal genicular lobe with 1 small spine, external genicular lobe unarmed; hind tibia with 68–79 inner spines and 69–76 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 reaching apex of hind basitarsus, which with 1 dorsal spine, ventral surface without bristles.

Posterior margin of every abdominal tergite straight, without tubercles. Epiproct ligulate, apex obtuse; paraproct simple, nearly rectangular. Cerci slender, conical, apices acute. Dorsal sclerite of genitalia short and broad, nearly M-shaped, lateral sclerites of dorso-median lobe oval, reaching subapex of dorso-median lobe, apex with 1 pair of small lobes, dorso-lateral lobe slightly longer than dorso-median lobe, ventro-median lobe obviously short. Subgenital plate quadrilateral, transverse and broad, posterior margin slightly concave.

Female. Appearance is similar to male. Ovipositor longer than half of hind femur, slightly curved upwards, dorsal margin smooth, apical area of ventral margin denticulate. Subgenital plate triangular, both sides of basal area with 1 triangular lobe respectively, apex acute.

Coloration. Body light brown. Fastigium verticis brown, eyes black, ocelli yellow. Basal half of hind femur with pinnate brown stripes.

Material examined. Holotype: male, Cave, Pogang Village, Zhengtun Town , Xingyi City, Guizhou, 24 August, 2017, coll. Huiming Chen. Paratypes: 3 males and 1 female, same collection data as for holotype .

Measurements (mm). Body: ♂ 17.8–21.0, ♀ 17.5; pronotum: ♂ 7.0–7.2, ♀ 6. 0; fore femur: ♂ 12.8–14.0, ♀ 13.6; hind femur: ♂ 27.8–29.5, ♀ 28.0; hind tibia: ♂ 29.0–315, ♀ 30.8; hind basitarsus: ♂ 5.2–5.8, ♀ 5.0; ovipositor: 17.2.

Distribution. China (Guizhou).

Etymology. Name is derived from the special structure of dorsal sclerite of male genitalia, Greek paradoxmeans special.

Discussion. The new species is most closely related to Tachycines (Gymnaeta) bifurcatus (Gorochov, 2010) , but it can be distinguished from the latter by the structure of dorsal sclerite of male genitalia and more spines of hind tibia.

Figures

FIGURE 4. Tachycines (Gymnaeta) paradoxus 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 5. Habitus of Tachycines (Gymnaeta) paradoxus sp. nov. Female.

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.