Acosmetura longitubera, Wang & Shi & Wang, 2018

Wang, Tao, Shi, Fu-Ming & Wang, Hai-Jian, 2018, One new species of the genus Acosmetura and supplement of Acosmetura emeica Liu & Zhou, 2007 (Tettigoniidae: Meconematinae) from Sichuan, China, Zootaxa 4462 (1), pp. 134-138 : 135-136

Acosmetura longitubera sp. nov.

( Fig. 1 )

Material examined. Holotype: male, Leidongping, Emeishan , Sichuan, 2 August, 2011, coll. Fu-Ming Shi and Le-Hong Zhao . Paratypes: 5 males and 5 females, Leidongping, Emeishan , Sichuan, 2 August, 2011, coll. Fu-Ming Shi and Le- Hong Zhao. Other specimens : 1 female, Yangxinsuo, Emeishan , Sichuan, 31 July, 2011, coll. Fu-Ming Shi and Le-Hong Zhao ; 14 males and 13 females, Leidongping, Emeishan , Sichuan, 2 August, 2011, coll. Fu-Ming Shi and Le-Hong Zhao ; 10 males and 6 females, Jiulaodong, Emeishan , Sichuan, 4 August, 2011, coll. Fu-Ming Shi and Le-Hong Zhao ; 4 males and 4 females, Leidongping, Emeishan , Sichuan, 22 August, 2017, coll. Tao Wang .

Description. Male. Body small. Fastigium verticis conical, narrower than antennal scape, blunt apically and grooved dorsally, connected with frontal verticis. Eyes nearly globular, obviously protruding forwards. Apical segment of maxillary palpi nearly equal to subapical one, apex swelled, truncate.

Pronotum short, anterior margin straight, posterior margin obtusely rounded, not surpassing posterior margin of 1 st abdominal tergite ( Fig. 1A ); posterior transverse sulcus indistinct, metazona slightly raised; lateral lobe longer than high, ventral margin arc-shaped, posterior margin straight, humeral sinus absent ( Fig. 1B ).

Tegmina short, covered by pronotum, only lateral area visible in lateral view, blunt apically, reaching posterior margin of metanotum; hind wings absent.

Femora unarmed on ventral surface, genicular lobes with apices obtuse. Fore coxae with 1 short spine, fore tibiae with 4 spines on both margins of ventral surface, tympanal organ open on both sides, ovoid. Middle tibiae with 2–4 inner and 4–6 outer spines on ventral surface. Hind tibiae unarmed on ventral surface, with 20–25 inner and 25–30 outer spines on dorsal surface, 1 pair of dorsal apical spurs and 2 pairs of ventral apical spurs.

10th abdominal tergite with a shallow and wide concavity, the lateral lobes compressed, protruding backwards, apices obtusely rounded, slightly curved downwards ( Fig. 1G ). Cercus cylindrical, long, slightly compressed, moderately incurved, basal area slightly stout, inner margin of 1/3 apical area slightly concave, apex obtusely rounded ( Fig. 1I ). Genitalia sclerotized, tongue-shaped, apex obtusely rounded ( Fig. 1J ). Subgenital plate nearly rectangular, basal area somewhat broad, with a triangular concavity, apical half curved upwards, posterior margin with a shallow concavity ( Fig. 1C, H ); styli stout and short, inserted on apico-lateral margins of subgenital plate.

Female. Appearance is similar to male. Metazona of pronotum not raised ( Fig. 1E ). Tegmina oval, deposited laterally. 10th abdominal tergite short, with a triangular depression, fused with dorsal surface of epiproct ( Fig. 1K ). Cercus conical, elongate, apex obtusely rounded, directed internally, ventrally ( Fig. 1F, K ). Ovipositor with basal area stout, apical half moderately curved upwards, dorsal margin smooth and ventral margin of subapical area with some small thin teeth, dorsal valvulae equal or slight longer than ventral ones, apices acute, ventral valvulae with apices subacute ( Fig. 1F ). Subgenital plate nearly semilunar, basal area slightly broad, with a broad and shallow concavity, posterior margin slightly concave ( Fig. 1L ).

Coloration. Body yellowish brown, probably green when alive. Eyes light brown, dorsal area of head brown. Disc of pronotum with a longitudinal brown stripe in the midline, in the middle of stripe with an indistinctly light stripe; the brown stripe slightly broader after metazona. Genicular lobes of hind femora brown, tarsi green. Dorsal surface of abdomen with a longitudinal brown stripe. Male cercus with apical half green; female cercus brown, probably green when alive.

Measurements (mm). Body: ♂ 8.17–9.38, ♀ 8.73–10.21; pronotum: ♂ 2.75–3.26, ♀ 2.84–3.35; tegmina: ♂ 1.23– 1.47, ♀ 1.03–1.29; hind femora: ♂ 7.28–8.38, ♀ 8.09–9.39; ovipositor: 5.12–5.58.

Distribution. China (Sichuan).

Discussion. The new species Acosmetura longitubera sp. nov. can be easily distinguished from known species of the genus by: posterior margin of male 10th abdominal tergite with a shallow and wide concavity, the lateral lobes compressed, protruding backwards, apices obtusely rounded; cerci cylindrical, long, moderately incurved. Posterior margin of female 10th abdominal tergite with a triangular depression, fused with epiproct.

Etymology. The name of the new species is derived from the lateral lobes of male 10th abdominal tergite elongate, Latin “ long -” means long, with Latin “ tuber -” means process.

Figures

FIGURE 1. Acosmetura longitubera sp. nov.: A–B, D–E. pronotum: A, D. dorsal view; B, E. lateral view; C, F–G, I, K. apex of abdomen: C, F. lateral view; G, K. dorsal view; I. dorso-apical view; H, L. subgenital plate in ventral view; J. genitalia in dorso-apical view; A–C, G–J. male; D–F, K–L. female.