Xizicus (Eoxizicus) dischidus Di, Han & Shi

Di, Juan-Xia, Han, Li, Mao, Shao-Li & Shi, Fu-Ming, 2015, Two new species of the genus Xizicus (Orthoptera: Tettigoniidae: Meconematinae) in China, Zootaxa 4007 (1), pp. 121-125 : 123-124

Xizicus (Eoxizicus) dischidus Di, Han & Shi sp. nov.

( Fig. 2 )

Male. Body medium-sized for the tribe Meconematini . Fastigium of vertex conical, apex obtusely rounded, with a shallow longitudinal furrow. Eyes ovoid, greatly protruding. Apical segment of maxillary palpi equal to subapical segment, apex faintly enlarged.

Pronotum short, anterior margin comparatively straight, posterior margin obtusely produced, metazona flattened, lateral lobe longer than high, humeral sinus shallow. Thoracic auditory spiracle exposed. ( Fig. 2 A–B).

Femora of all legs unarmed on ventral surface. Procoxae unarmed; internal and external sides of ventral surface of protibiae with 5 spines and 6 spines respectively, tibial tympana open on both sides; mesotibiae equipped with 5 spines and 6 spines on internal and external sides of ventral surface respectively; posttibiae with 30 and 33 spines on internal and external sides of dorsal surface respectively, with 1 pair of dorsal apical spurs and 2 pairs of ventral apical spurs.

Tegmina macropterous, narrow and long, apices angularly obtuse, stridulatory area almost covered by pronotum; hind wings longer than tegmina.

Tenth abdominal tergite with 1 pair of small and short processes on posterior margin, apices obtusely rounded ( Fig. 2 C–D). Cerci long, base stout and cylindrical, with a small tuberculate process on inner margin ( Fig 2 D–E), middle area separated into internal and external lobes, internal lobe with base stout, notably longer than external one, significantly curved inwards, apex acute; external lobe compressed, triangular in shape, slightly curved inwards, obtuse apically ( Fig. 2 C–D, F). Subgenital plate narrow and elongate, basal margin slightly concave, apex separated into two parts near middle area, curved upwards apically, without styli ( Fig. 2 F–G).

Coloration. Body light yellowish brown, maybe green when alive. Disc of pronotum with 1 pair of darkish brown stripes on lateral margins. Spines on ventral surface of protibiae and mesotibiae brown. All spines and spurs on posttibiae darkish brown. The third tarsi and claw of all legs brown. Genicular lobes of postfemora with a black spot apically. Posterior margin of tegmina darkish brown.

Female. Unknown.

Type material. Holotype: male, Bangliang, Jingxi, Guangxi, 6 August, 2010, collected by Xun Bian.

Measurements (mm). Body: ♂10.8; pronotum: ♂4.8; tegmina: ♂21.6; postfemora: ♂11.2.

Etymology. The specific name derives from the apex of subgenital plate separated into two branches.

Diagnosis. The new species is similar to Xizicus (Eoxizicus) rehni ( Tinkham, 1956) , but differs from the latter in: male cercus long, with a small tuberculate process on inner margin of base ( Fig 2 D–E), apex bifurcated into internal and external lobes, internal branch notably long, remarkably curved inwards, apex acute; external one compressed, nearly triangular in shape( Fig. 2 C–D, F); apex of subgenital plate separated into two branches near central area, curved upwards; without styli ( Fig. 2 F–G).

It resembles the previous new species Xizicus (Eoxizicus) uncicercus Mao & Shi sp. nov., but processes of male tenth abdominal tergite small and short( Fig. 2 C–D); base of male cercus with a small tuberculate process on inner margin, base of internal branch of cercus stout, external branch of cercus compressed, triangular in shape ( Fig. 2 C–F); subgenital plate narrow and long, apex separated into two parts near the middle, curved upwards; without styli ( Fig. 2 F–G).

Distribution. China (Guangxi).

Figures

FIGURE 2. Xizicus (Eoxizicus) dischidus Di, Han & Shi sp. nov., male: A – B. pronotum: A. in dorsal view; B. in lateral view; C – D, F. apex of abdomen: C. in dorsal view; D. in dorso-lateral view; F. in ventral view; E. a small tuberculate on inner side of base of cercus; G. apex of subgenital plate in ventral view.