Diestramima lamina, Wang & Zhu & Shi, 2019

Wang, Ping, Zhu, Qidi & Shi, Fuming, 2019, Supplement of the genus Diestramima Storozhenko, 1990 (Orthoptera: Rhaphidophoridae: Aemodogryllinae) from China, Zootaxa 4615 (3), pp. 577-584 : 580-583

Diestramima lamina sp. nov.

( Figs. 2–3 ; Map. 1 )

Description. Male. Body slightly larger than congeneric known species. Fastigium verticis with 2 conical tubercles, apices drawn together, obtusely rounded, directing forward ( Fig. 2A, 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. 2 A–B). Apical segment of maxillary palp obviously longer than subapical one, apex inflated, globular.

Pronotum broad, anterior margin of disc rather straight, posterior margin distinctly protruding backward; lateral lobe longer than high, ventral margin arc-shaped ( Fig. 2 B–C). Mesonotum and metanotum slightly narrow, posterior margin of mesonotum distinctly protruding backward, posterior margin of metanotum rather 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 9–11 inner spines on ventral surface, internal genicular lobe with 1 small spine, external genicular lobe unarmed; tibiae with 36–38 inner spines and 40–42 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, intero-dorsal spine slightly shorter than hind basitarsi; hind basitarsi with 2–4 dorsal spines ( Fig. 2I ).

Posterior margin of sixth abdominal tergite slightly straight. Posteromedian process of seventh abdominal tergite rather long, basal one third slightly broad, subsequently narrow, nearly parallel on both sides, curved backward and downward, posterior margin concave ( Fig. 2 D–E). Epiproct simple, tongue-shaped. Paraproct slightly long, basal half broad, apical half nearly quadrilateral, lamellate, slightly narrower than basal half, posterior margin slightly concave ( Fig. 2D ). Cerci slender, conical, apices acute. Genitalia with 8 membranous lobes, apical area of dorso-median lobe slightly concave, dorso-lateral and ventro-lateral lobes nearly equal to dorso-median lobe ( Fig. 3 A–B). Basal part of subgenital plate broad, apical part slightly narrow, with a triangular posteromedian process, apex obtusely rounded, pointing backward and upward ( Fig. 2F ).

Female. Appearance is similar to male. Ovipositor longer than half of hind femora, dorsal margin smooth, apical areas of ventral margin denticulate ( Fig. 2H ). Subgenital plate nearly triangular, both sides of basal area with 1 oval lobe respectively, apex obtusely rounded ( Fig. 2G ).

Coloration. Dorsal surface of body brown, ventral surface yellowish brown. Eyes black, ocelli yellow. Ventral surface of scape of antenna black. Face with 4 longitudinal black stripes. Apices of femora with ring-like black stripes, basal half of hind femora with penniform stripes. Spines of hind tibiae and femora black.

Material examined. Holotype: male, Nonggang, Longzhou , Guangxi, 1 August, 2018, coll. Qidi Zhu. Paratypes: 4 males, Nonggang, Longzhou , Guangxi, 1 August, 2018, coll. Qidi Zhu ; 2 females, Nonggang, Longzhou , Guangxi, 3 August, 2018, coll. Qidi Zhu. Other specimens: 3 males, Nonggang, Longzhou , Guangxi, 1 August, 2018, coll. Qidi Zhu ; 2 females, Nonggang, Longzhou , Guangxi, 3 August, 2018, coll. Qidi Zhu.

Measurements (mm). Body: ♂ 26.5–28.0, ♀ 29.0–35.0; pronotum: ♂ 10.0–11.0, ♀ 9.0–9.5; fore femora: ♂ 18.0– 19.5, ♀ 17.0–19.0; hind femora: ♂ 35.5–37.0, ♀ 33.5–37.0; hind tibiae: ♂ 39.0–40.2, ♀ 34.2–38.0; hind basitarsi: ♂ 8.3–9.0, ♀ 7.5–9.0; ovipositor: 22.5–24.0.

Distribution. China (Guangxi).

Discussion. The new species can be easily distinguished from congeneric known species by: posteromedian process of male seventh abdominal tergite rather long, basal one third slightly broad, subsequently narrow, nearly parallel on both sides, curved backward and downward, posterior margin concave; paraproct slightly elongate, basal half broad, apical half nearly quadrilateral, lamellate, slightly narrower than basal half, posterior margin slightly concave; basal part of subgenital plate broad, apical part slightly narrow, with a triangular posteromedian process, apex obtusely rounded, pointing backward and upward.

Etymology. The name of the new species refers to apical half of male paraproct being lamellate. Latin “ lamin- ” referring to lamellate.

Figures

MAP 1. Distribution of the genus Diestramima from China.

FIGURE 2. Diestramima lamina 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. apico-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 3. Male genitalia. A–B. Diestramima lamina sp. nov.; C–D. Diestramima arbora sp. nov.: A, C: dorsal view; B, D: ventral view.