Diestramima truncata, 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 : 271-273

Diestramima truncata sp. nov.

( Figs. 17–18 )

Description. Male. Body medium-sized. Fastigium verticis narrower than scape of antenna, divided into 2 conical tubercles, bases of tubercles drawn together, apices separated, obtuse, protruding forward ( Fig. 17A, C ). Eyes oval, obviously protruding forward; median ocellus oval, located between antennal sockets; lateral ocelli nearly circular, situated on lateral margins of basal fastigium verticis ( Fig. 17A–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. 17B–C ). Posterior margin of mesonotum protruding backward. Posterior margin of metanotum slightly straight.

Fore coxae with 1 small spine; femora unarmed on ventral surface, internal genicular lobe with 1 small spine, 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 7 inner spines on ventral surface; tibiae with 28 inner spines and 37 outer spines on dorsal surface, subapices with 1 pair of dorsal spines and 2 pairs of ventral spines, interio-dorsal spine obviously longer than hind basitarsi; hind basitarsi with 3 dorsal spines ( Fig. 17F ).

Posteromedian process of 7th abdominal tergite long, surpassing apex of paraproct, basal half of posteromedian process broad, the middle area curved downward, constricted, subsequently narrow, apex truncate ( Fig. 17D–E ). Base of paraproct broad, curved upward, apical area spine-shaped, acute, directing upward ( Fig. 17D ). Cerci slender, conical, apices acute. Genitalia completely membranous, with 8 lobes, dorso-median lobe nearly quadrangular, apex with 1 notch ( Fig. 18C–D ).

Female. The middle of posterior margin of 7th abdominal tergite with 1 small angle-shaped process ( Fig. 17H ). Subgenital plate nearly triangular, both sides of basal area with 1 small process respectively, apex obtusely rounded ( Fig. 17G ). Dorsal valvulae of ovipositor smooth, apical areas of ventral valvulae denticulate on ventral surface ( Fig. 17H ).

Coloration. Body brown, some specimens with 1 longitudinal yellow stripe on dorsal surface. Behind the eyes with 1 black stripe, ocelli yellow. Inner margin of scape of antenna black, flagellum yellow. Face with 4 longitudinal black stripes, both sides of clypeus with 1 black spot respectively. Apices of femora with ring-like black stripes. Spines of hind femora and tibiae black.

Material examined. Holotype: male, Liulashan, Dayaoshan , Guangxi, 12 August, 2010, coll. Duoduo Ye . Paratypes: 1 female, Liulashan, Dayaoshan , Guangxi, 12 August, 2010, coll. Duoduo Ye ; 1 male and 1 female, Qigongli, Dayaoshan , Guangxi, 15 August, 2011, coll. Zhilin Chen .

Measurements (mm). Body: ♂ 19.0–20.4, ♀ 19.0–19.2; pronotum: ♂ 6.0–6.2, ♀ 6.2–6.8; fore femora: ♂ 13.2– 14.0, ♀ 13.2–13.8; hind femora: ♂ 25.0–26.5, ♀ 26.0–26.2; hind tibiae: ♂ 27.2–27.8, ♀ 28.6–28.8; hind basitarsi: ♂ 4.8–5.0, ♀ 5.2–5.5; ovipositor: 18.6–19.0.

Distribution. China (Guangxi).

Discussion. The new species could be easily distinguished from other species of the genus by posteromedian process of 7th abdominal tergite long, surpassing apex of paraproct, basal half of posteromedian process broad, the middle area curved downward, constricted, subsequently narrow, apex truncate; base of paraproct broad, curved upward, apical area spine-shaped, acute, directing upward.

Etymology. The name of the new species is derived from apex of posteromedian process of 7th abdominal tergite truncate, Latin truncat- means truncate.

Figures

FIGURE 17. Diestramima truncata 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.