Diestramima subtilis, Zhu & Shi, 2018

Zhu, Qi-Di & Shi, Fu-Ming, 2018, Review of the genus Diestramima Storozhenko, 1990 (Orthoptera: Rhaphidophoridae: Aemodogryllinae) from China, Zootaxa 4450 (2), pp. 249-274 : 267-268

Diestramima subtilis sp. nov.

( Figs. 14 , 18 )

Description. Male. Body medium-sized. Fastigium verticis divided into 2 conical tubercles, bases of tubercles drawn together, apices separated, obtuse, directing forward, slightly oblique downward ( Fig. 14A, C ). Eyes oval, protruding forward; median ocellus oval, located between antennal sockets; lateral ocelli nearly circular, situated on lateral margins of basal fastigium verticis ( Fig. 14A–B ). Apical segment of maxillary palp distinctly longer than subapical one, apex inflated, globular.

Anterior margin of pronotum rather straight, posterior margin protruding backward; lateral lobe longer than high, anterior margin straight, ventral margin arc-shaped ( Fig. 14B–C ). Posterior margin of mesonotum protruding backward, ventral margin of lateral lobe nearly semi-rounded. Posterior margin of metanotum slightly straight.

Fore coxae with 1 small spine; femora unarmed on ventral surface, external genicular lobe with 1 long spine; tibiae with 2 inner spines and 2 outer spines on ventral surface, apices 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 femora unarmed on ventral surface, internal and external genicular lobes with 1 long spine respectively; tibiae with 2 inner spines and 2 outer spines on ventral surface, apices with 1 pair of dorsal spines and 1 pair of ventral spines, between the paired ventral spines with 1 small spine. Hind femora with 6–9 inner spines on ventral margin; tibiae with 32–37 inner spines and 34–36 outer spines on dorsal surface, subapices with 1 pair of dorsal spines, apices with 1 pair of dorsal spines and 2 pairs of ventral spines, interio-dorsal spine slightly longer than hind basitarsi, hind basitarsi with 2 dorsal spines ( Fig. 14F ).

Base of posteromedian process of 7th abdominal tergite broad, both sides of apical half nearly parallel, the middle of apex slightly prominent ( Fig. 14D–E ). Basal half of paraproct slightly broad, apical half narrow, apex obtuse, directing dorso-backward ( Fig. 14D ). Cerci slender, conical, apices acute. Genitalia completely membranous, with 8 lobes, apex of dorso-median lobe truncate, ventro-median lobe slightly shorter, apex with 1 obviously notch ( Fig. 14E–F ).

Female. Base of ovipositor slightly broad, narrowing to apex, dorsal valvulae smooth, apical areas of ventral surfaces of ventral valvulae denticulate ( Fig. 14H ). Subgenital plate nearly triangular, broad and short, both sides of basal area with 1 small process respectively, apex obtusely rounded ( Fig. 14G ).

Coloration. Body light brown, one specimen collected from Bozhushan, Wenshan, Yunnan reddish-brown. Eyes black, subsequently with black stripes. Face with 4 longitudinal black stripes, some specimens with only 2 longitudinal black stripes. Both sides of clypeus with 1 black spot respectively. Apices of all femora black, spines of hind femora and tibiae black.

Material examined. Holotype: male, Wenlongxiang, Jingdong , Pu’er , Yunnan, 31 July, 2017, coll. Tao Wang . Paratypes: 1 female, Wenlongxiang, Jingdong, Pu’er , Yunnan, 30 July, 2017, coll. Tao Wang ; 1 male, Bozhushan, Wenshan , Yunnan, 5 August, 2017, coll. Yongxia Wu and Yujie Dou ; 1 male and 1 female, Xiaojie, Wenshan , Yunnan, 31 July, 2017, coll. Yongxia Wu and Yujie Dou .

Measurements (mm). Body: ♂ 22.0–23.0, ♀ 18.2–19.8; pronotum: ♂ 6.1–6.2, ♀ 5.8–6.2; fore femora: ♂ 10.8– 11.8, ♀ 9.2–11.0; hind femora: ♂ 21.0–24.0, ♀ 18.0–22.8; hind tibiae: ♂ 21.2–24.2, ♀ 18.1–23.4; hind basitarsi: ♂ 4.6–5.2, ♀ 4.0–4.2; ovipositor: 12.9–16.2.

Distribution. China (Yunnan).

Discussion. The new species differs from Diestramima triangulata Qin, Wang, Liu & Li, 2016 and Diestramima beybienkoi Qin, Wang, Liu & Li, 2016 by: base of posteromedian process of 7th abdominal tergite broad, both sides of apical half nearly parallel, the middle of apex slightly prominent; basal half of paraproct slightly broad, apical half narrow, apex obtuse, directing dorso-backward; apex of dorso-median lobe of male genitalia truncate.

Etymology. The name of the new species refers to the middle of apex of posteromedian process of 7th abdominal tergite slightly prominent, Latin subtil - means subtile .

Figures

FIGURE 14. Diestramima subtile sp. nov., A–F. male, G–H. female: A–C. head and pronotum: A. frontal view, B. lateral view, C. dorsal view; D–E. apex of abdomen: D. lateral view, E. dorsal view; F. hind basitarsus in lateral view; G. subgenital plate in ventral view; H. ovipositor in lateral view.

FIGURE 18. Male genitalia. A–B. Diestramima beybienkoi Qin, Wang, Liu & Li, 2016; C–D. Diestramima truncata sp. nov.; E–F. Diestramima subtilis sp. nov.; G–H. Diestramima tibetensis Qin, Wang, Liu & Li, 2016; I–J. Diestramima cycla sp. nov.; K–L. Diestramima subrectis Qin, Wang, Liu & Li, 2016; M–N. Diestramima triangulata Qin, Wang, Liu & Li, 2016; O–P. Diestramima intermedia Liu & Zhang, 2001; Q–R. Diestramima acutiapicis sp. nov.: A, C, E, G, I, K, M, O, Q: dorsal view; B, D, F, H, J, L, N, P, R: ventral view.