Diestramima cycla, 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 : 258-260

Diestramima cycla sp. nov.

( Figs. 7 , 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, directing forward ( Fig. 7A, C ). Eyes oval, obviously protruding forward; median ocellus oval, located between antennal sockets; lateral ocelli nearly circular, situated on lateral margins of bases of fastigium verticis ( Fig. 7A–B ). Apical segment of maxillary palp distinctly longer than subapical one, apex inflated, globular.

Anterior margin of pronotum rather straight, posterior margin distinctly protruding backward; lateral lobe longer than high, ventral margin arc-shaped ( Fig. 7B–C ). Posterior margin of mesonotum obviously protruding backward. Posterior margin of metanotum slightly protruding backward.

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 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 3–4 inner spines on ventral surface; tibiae with 26–29 inner spines and 28–31 outer spines on dorsal surface, spines arranged in average, 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 1–2 dorsal spines ( Fig. 7F ).

Posteromedian process of 7th abdominal tergite slightly surpassing apex of paraproct, posteromedian process broad, both sides of basal half nearly parallel, apical half slightly broader than basal half, nearly circular ( Fig. 7D– E ). Basal half of paraproct broad, narrowing to apex, apex acute, directing backward ( Fig. 7D ). Cerci slender, conical, apices acute ( Fig. 7D ). Genitalia completely membranous, with 8 lobes, dorso-median lobe narrow, nearly triangular, apex with 1 notch, ventro-median lobe short, apical area with 1 notch ( Fig. 18 ).

Female. Appearance is similar to male. Posterior margin of 7th abdominal tergite with 1 angle-shaped process ( Fig. 7H ). Dorsal valvulae of ovipositor smooth, slightly longer than ventral valvulae, apical areas of ventral surfaces of ventral valvulae denticulate ( Fig. 7H ). Subgenital plate semi-circular, both sides of basal area with 1 small process respectively, apex obtusely rounded ( Fig. 7G ).

Coloration. Body light brown. Eyes black, ocelli yellow. Inner margin of scape of antenna black. Face with 4 longitudinal black stripes. Legs with ring-like black stripes. Spines of hind femora and tibiae black.

Material examined. Holotype: male, Wanniansi, Emeishan , Sichuan, 22 August, 2017, coll. Tao Wang . Paratypes: 2 males and 4 females, Wanniansi, Emeishan , Sichuan, 22 August, 2017, coll. Tao Wang .

Measurements (mm). Body: ♂ 21.2–22.0, ♀ 19.6–22.0; pronotum: ♂ 4.6–7.0, ♀ 4.8–5.1; fore femora: ♂ 10.2– 10.8, ♀ 10.3–10.6; hind femora: ♂ 19.4–19.8, ♀ 19.2–20.0; hind tibiae: ♂ 21.0–21.2, ♀ 20.2–20.8; hind basitarsi: ♂ 4.3–4.6, ♀ 4.2–4.3; ovipositor: 16.6–16.8.

Distribution. China (Sichuan).

Discussion. The new species is most closely related to Diestramima triangulata Qin, Wang, Liu & Li, 2016 , but it can be easily distinguished from it in following combination of characters: posteromedian process of male 7th abdominal tergite slightly surpassing apex of paraproct, posteromedian process broad, both sides of basal half nearly parallel, apical half slightly broader than basal half, apex nearly rounded. Apical area of dorso-median lobe of male genitalia with 1 notch.

Etymology. Name is derived from apex of posteromedian process of male 7th abdominal tergite rounded, Greek cycl - means rounded.

Figures

FIGURE 7. Diestramima cycla 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.