Mimadiestra dicha, Zhu & Wu & Shi, 2018

Zhu, Qi-Di, Wu, Yong-Xia & Shi, Fu-Ming, 2018, The genus Mimadiestra Storozhenko & Dawwrueng, 2014 (Orthoptera: Rhaphidophoridae) from China, with description of two new species, Zootaxa 4531 (2), pp. 295-300 : 298-300

Mimadiestra dicha sp. nov.

( Figs. 2–3 ; Map. 1)

Description. Male. Body medium-sized. Fastigium verticis divided into two conical tubercles, apices divided, blunt, directing forward. Eye oval, protruding forward; median ocellus oval, located between antennal sockets; lateral ocelli nearly circular, situated on lateral margins of conical tubercles of fastigium verticis.

Anterior margin of pronotum slightly protruding forward, posterior margin arc-shaped, protruding backward; lateral lobes longer than high, anterior and posterior margins slightly straight, ventral margins arc-shaped. Posterior margin of mesonotum protruding backward, ventral margins of lateral lobes arc-shaped, slightly protruding backward. Posterior margin of metanotum rather straight, ventral margins of lateral lobes arc-shaped.

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, with 1 pair of ventral spines, between the paired ventral spines with 1 small spine. Middle femora unarmed on ventral surface, apices with 1 pair of long spines; tibiae with 1 inner spine 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 4–5 inner spines on ventral surface; tibiae with 23–25 inner spines and 29–31 outer spines, subapices with 1 pair of dorsal spines, apiecs with 1 pair of dorsal spines and 2 pairs of ventral spines, interio-dorsal spine slightly longer than hind basitarsi; of which with 2 dorsal spines, and with bristles on ventral surface.

MAP 1. Distribution of the genus Mimadiestra from China.

Posterior margin of 6 th abdominal tergite obtusely rounded. Posterior margin of 7 th abdominal tergite with 2 processes, nearly triangular, bases of processes curved downward, apices blunt, directing posterio downward; between the 2 processes with 1 small triangular process, pointing downward. Paraproct developed, basal part broad, apex divided into dorsal and ventral branches, dorsal branch slender, conical, directing dorso-backward, apex acute, curved downward; ventral branch compressed, nearly triangular in lateral view, apex acute, pointing inward. Genitalia with 6 lobes, dorsal-median lobe distinctly longer than lateral lobes, with tongue-shaped sclerotic tergite, apex blunt; ventral-median lobe obviously shorter than dorsal-median lobe.

Female. Unknown.

Coloration. Body brown. Face with black stripes, inner margin of scape of antenna light brown. Legs with yellow spots.

Material examined. Holotype: male, Jiguanshan, Xichou , Yunnan, 29 July, 2017, coll. Yongxia Wu.

Measurements (mm). Body: ♂ 14.6; pronotum: ♂ 4.4; fore femora: ♂ 6.2; hind femora: ♂ 13.8; hind tibiae: ♂ 14.2; hind basitarsi: ♂ 3.4.

Distribution. China (Yunnan).

Etymology. The name of the new species refers to male paraproct developed, basal part broad, apex divided into dorsal and ventral branches, Greek dich- means dichotomous.

Discussion. The new species could be easily distinguished from other congeneric species by the shape of male paraproct and genitalia. Dorsal-median lobe of male genitalia with tongue-shaped sclerotic tergite, which distinctly differs from other species. Due to posterior margin of 7 th abdominal tergite with 2 processes, we regard it as a species which belongs to the genus Mimadiestra .

Figures

FIGURE 2. Mimadiestra dicha sp. nov., A–H. male: A–C. head and pronotum: A. frontal view, B. lateral view, C. dorsal view; D–G. apex of abdomen: D. dorsal view, E. apico-dorsal view, F. apico-lateral view, G. lateral view; H. hind basitarsus in lateral view.

FIGURE 3. Male genitalia. A–B. Mimadiestra gracila sp. nov.; C–D. Mimadiestra dicha sp. nov.. A, C: dorsal view; B, D: ventral view.