Acosmetura listrica Bian & Shi

Bian, Xun & Shi, Fu-Ming, 2015, New Acosmetura species (Orthoptera: Tettigoniidae: Meconematinae) from China, with notes on their distribution, Zootaxa 4040 (4), pp. 477-482 : 478-480

Acosmetura listrica Bian & Shi sp. nov.

( Figs. 1 , 2 , Map 1)

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:471942

Type. Holotype: male, Qingtaiguan, Luotian, Hubei, 18 September, 2014, coll. by Guang-Lin Xie. Paratypes: 1 male, Dabieshan, Yingshan, Hubei, 19 September, 2014, coll. by Li Han; 1 female, Qingtaiguan, Luotian, Hubei, 18 September, 2014, coll. by Guang-Lin Xie; 1 male and 1 female, Longtanshan, Qinglingfeng, Zhejiang, 31 July, 2012, coll. by Guang-Lin Xie.

Description. Male. Body small, robust. Fastigium verticis conical, apex obtuse, furrowed in midline ( Fig. 1 A). Eyes oval, obviously protruding forwards. Apical segment of maxillary palpi slightly longer than subapical one, apex slightly inflated.

Pronotum short, transversal sulcus indistinct, metazona slightly raised, anterior margin nearly straight, posterior margin obtusely rounded; lateral lobe longer than high, the hind margin slant, humeral sinus absent ( Figs. 1 A–B).

Ventral surface of femora of all legs smooth, without spines. Procoxae with a short spine; protibiae with 4 pairs of spines on ventral surface and a pair of ventral apical spurs; tibial tympana opened on both sides, oval. Mesotibiae with 4 pairs of spines on ventral surface, and a pair of ventral apical spurs. Genicular lobes of postfemora with apices obtuse; posttibiae with 18–20 dorsal spines on each side, 1 pair of dorsal apical spurs and 2 pairs of ventral apical spurs.

Tegmina short, slightly surpassing the posterior margin of pronotum, apices obtusely rounded. Hind wings absent ( Fig. 1 B).

Posterior margin of tenth abdominal tergite obviously projected, with 1 shallow semicircular concavity in the middle ( Fig. 1 C). Epiproct short, apical area obtusely rounded. Cerci hook-shaped, basal area stout, apical half obviously upcurved, apices acute ( Fig. 1 D). Genitalia sclerotized, basal area broad, narrowing to apex, apical area shovel-shaped ( Fig. 1 C). Basal area of subgenital plate slightly broad, narrowing, basal margin arched concave, posterior margin somewhat straight, slightly projected in the middle ( Fig. 1 E). Styli conical, apices obtuse, located on apico-lateral margins of subgenital plate.

Female. Appearance is similar to male with following exceptions: Tenth abdominal tergite with a median concavity on posterior margin ( Fig. 1 J). Cerci conical, apices thin and acute. Ovipositor gently curved upwards, base stout, narrowing, dorsal and ventral margins smooth, apices acute ( Fig. 1 H). Subgenital plate longer than broad, basal area broad, narrowing, posterior margin obtusely rounded with a median concavity ( Fig. 1 I).

Coloration. Body yellowish green. Disk of pronotum with 1 pair of longitudinal brown stripes, between of which light brown, the outer margins with yellowish stripes. Posttibial spines and spurs with apices brown. Apices of male cerci brown.

Stridulatory organ. Stridulatory area of male left tegmen large, nearly trapezoid, poorly defined ( Fig. 2 A). Stridulatory file elevated on thickened vein, sinuous in proximal fourth, nearly L-shaped, 1.508 mm long, with 79–81 teeth, main teeth very robust ( Fig. 2 B).

Measurements (mm). Body: ♂ 9.3–9.8, ♀ 8.8–9.0; pronotum: ♂ 4.2–4.5, ♀ 4.0–5.0; postfemora: ♂ 8.0–8.5, ♀ 10.3– 11.0; ovipositor: 6.0–6.4.

Discussion. Acosmetura listrica sp. nov. can be easily distinguished from the species Acosmetura emeica Liu & Zhang, 2007 in: male cerci hook-shaped, the apical area upcurved; posterior margin of female subgenital plate with 1 median concavity. In Acosmetura emeica , male cerci nearly straight, apices depressed, ventral margin with 1 digitate lobe; posterior margin of female subgenital plate obtusely rounded.

Etymology. The name of the new species is derived from Latin ‘ listric ’, alluding to male genitalia morphology.

Distibution. According to the comprehensive physical geographical regionalization, the Chinese physicgeographical environment includes seven temperature zones, five humid zones and forty-five comprehensive physical geographical areas ( Zhang, 2011). The new species is found in Dabieshan, Hubei and Qingliangfeng, Zhejiang (Map 1), which belong to the Huinan and the middle and lower reaches of Changjiang River area of Northern Subtropical Humid Climate Zone. After observing and analyzing, the two localities have similar katydid’s faunistic components. We think the area should be treated as a special subregion for the fauna of China.

MAP 1. Distribution of Acosmetura listrica Bian & Shi sp. nov. in China.

Figures

FIGURE 1. Acosmetura listrica Bian & Shi sp. nov.: A – B, F – G. head and pronotum: A, F. dorsal view; B, G. lateral view; C – D, H, J. apex of abdomen: C, J. dorsal view; D, H. lateral view; E, I. subgenital plate in ventral view; A – E. male; F – I. female.

FIGURE 2. Left tegmen and scanning electron micrograph of male stridulatory file for Acosmetura listrica Bian & Shi sp. nov.: A. male left tegmen; B. scanning electron micrograph of stridulatory file.