Pseudoxistrella Liang 1991
Creators: name: Yu, Sergey
name: Omelko, Mikhail M.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tetrigidae
Pseudoxistrella

description: Genus Pseudoxistrella Liang, 1991
Pseudoxistrella Liang, 1991: 95; Blackith, 1992: 153; Liang & Zheng, 1998: 127, 242, 247; Otte, 1997: 140; Zheng, 2005: 110, 455.
Type species: Pseudoxistrella eurymera Liang, 1991, by original designation.
Description. Body slender, slightly granulated (Fig. 1). Antennae filiform, 14-segmented (Fig. 2), 2.5-2.6 times longer than fore femora; antennal bases situated below lower margin of eyes (Fig. 4). Eyes protruding above pronotum in lateral view (Fig. 9), and distinctly separated from anterior margin of pronotum in dorsal view (Fig. 3). Fastigium of vertex near the middle of eyes slightly narrower than width of one eye in dorsal view, anterior margin of fastigium broadly rounded and reaching anterior edge of eyes; median carina of fastigium reaching the mid of eyes (Fig. 3); in frontal view fastigium of vertex forming V-shape shallow concavity (Fig. 4). Frontal ridge in lateral view with excision below antennal sockets (Fig. 2); lateral carinae of frontal ridge in frontal view closely related one to another especially between antennal sockets (Fig. 4).
Pronotum in dorsal view with straight anterior margin; posterior process of pronotum very long, surpassing far beyond the apex of abdomen. Median carina of pronotum low, almost straight (Fig. 9); lateral carinae in prozona reduced or distinct, parallel-side (Fig. 1). Hind margin of lateral lobes of pronotum bisinuate, tegminal (upper) sinus almost as deep lower sinus (Fig. 9); posterior angle of lateral lobes pronotum rounder and turned downward (Fig. 1). Tegmina ovate; hind wings long, extending or slightly exceeding the apex of posterior process of pronotum. Legs elongated; fore and mid femora with almost straight and gentle dentate upper and lower carinae (Fig. 5); hind femora with gentle dentate upper carina and almost completely smooth lower carina (Fig. 8). First segment of fore legs slightly shorter than second segment (without claws) and widened, 2.2–3 times as wide as second segment (Fig. 6); first tarsal segment of mid legs also widened, but distinctly shorter than second one; pulvilli (ventral pads of tarsi) of the basitarsus of fore and mid legs are fused in the large sucker (Fig. 7). First tarsal segment of hind legs 2.1 times longer than 3rd segment (without claws); dorsal side of 1st segment with three triangular pads (Fig. 8). Male subgenital plate in lateral view short, conical (Fig. 10). Female subgenital plate with pointed posterior margin (Fig. 12). Valves of ovipositor narrow, dentate (Fig. 11).
Diagnosis. Pseudoxistrella is closely related to the genus Xistra Bolívar, 1887 (sensu Zheng & Zeng, 2011), but easy distinguished from latter, as well as from all other genera of subfamily Metrodorinae, by almost completely fused lateral carinae of frontal ridge.
Composition. There are two species from China and Vietnam, one of which is described below.
description: Published as part of Yu, Sergey & Omelko, Mikhail M., 2012, Review of the genus Pseudoxistrella Liang, 1991 (Orthoptera: Tetrigidae, Metrodorinae), pp. 59-65 in Zootaxa 3573 on pages 59-60, DOI: 10.5281/zenodo.210291