Xizicus (Xizicus) rectangulatus, Wang & Zheng & Chang, 2025

Wang, Yang, Zheng, Xiang & Chang, Yanlin, 2025, Two new species of the genus Xizicus Gorochov, 1993 (Tettigoniidae: Meconematinae) from China with description of the female of Acosmetides dilobosa Chang, Wang & Shi, 2021, Zootaxa 5666 (2), pp. 279-286 : 280-281

Xizicus (Xizicus) rectangulatus sp. nov., Chinese name: AEṱadz

( Fig. 1 )

Description. Male. Body small. Head. Fastigium verticis conical, with longitudinal sulcus on dorsum, apex rounded. Eyes ovoid, slightly protruding forwards and outwards. Apical segment of maxillary palpus faintly longer than subapical one, apex slightly inflated. Thorax. Anterior margin of pronotum straight, posterior margin rounded ( Fig. 1A ); lateral lobe longer than high, humeral sinus absent. Thoracic auditory spiracle exposed completely, peanutshaped ( Fig. 1B ). Tegmina and wings. Tegmina long, surpassing apices of hind femora, apices rounded; hind wings longer than tegmina. Legs. All femora without spines on ventral surfaces. Fore coxa with 1 spine, fore tibial tympana open on both sides, fore tibia with 4 pairs of long spines and 1 pair of short apical spurs on ventral surface. Middle tibia with 4 external and 3 internal long spines on ventral surface, with 1 pair of short ventral apical spurs. Hind tibia with 34–37 short spines on both sides of dorsal surface separately, bearing 1 pair of dorsal apical spurs and 2 pairs of ventral apical spurs. Abdomen. Basal third of tenth abdominal tergite broad, following area toward middle area narrowing; apical half narrow, and apical area extending with a median longitudinal sulcus ( Fig. 1C ); dorsal apex of lateral lobe strongly raised, other area expanded downwards, compressed, apex rounded ( Fig. 1E ). Cercus stout at base, inner margin near base with a broad, short rectangular lamellar expansion on ventral surface ( Fig. 1D ); near middle area on intero-dorsal surface with an incurved, long and narrow lamellar process ( Fig. 1C ); apical half strongly incurved, apex rounded ( Fig. 1D ). Apex of genitalia sclerotized, lamellate, posterior margin rounded. Subgenital plate with basal half broad, apical half narrowing, posterior margin rounded. Styli conical, inserted on lateral margins of subapical area of subgenital plate ( Fig. 1D ).

Female. Cercus short, conical. Ovipositor slightly upcurved, basal area stout; dorsal and ventral margins smooth, dorsal valve slightly longer than ventral one, apex acute; ventral valve with a feeble hook at apex ( Fig. 1I ). Subgenital plate with basal half broad, apical half narrowing, apex rounded ( Fig. 1G ).

Coloration. Body yellowish brown. Dorsal surface of head with 4 indistinct longitudinal dark brown stripes. Eyes brown. Antennal scape and pedicel dark brown, first flagellum dark brown, remaining flagellum weak yellow. Disc of pronotum with a broad longitudinal brown stripe, posterior area of metazona yellowish brown. Hind femur with a narrow transverse brown stripe at base and a broad transverse brown stripe in middle area ( Fig. 1H ).

Material examined. Holotype: ♂, Nonggang, Longzhou , Guangxi, 31 July, 2018, collected by Qidi Zhu. Paratype: 1♀, same data as holotype .

Measurements (mm). Body length: ♂ 9.5, ♀ 11.0; pronotum length: ♂ 3.8, ♀ 3.5; tegmen length: ♂ 17.0, ♀ 18.2; hind femur length: ♂ 11.3, ♀ 12.1; ovipositor length: 9.5.

Etymology. The new species name refers to base of male cercus with rectangular lamellar expansion on inner margin of ventral surface, Latin rectangulatus means rectangular.

Discussion. The new species is very similar to Xizicus (Xizicus) daedalus Gorochov, 2011 , but differs in morphology of male tenth abdominal tergite and shape of male cercus.

Distribution. China (Guangxi).

Figures

FIGURE 1. Xizicus (Xizicus) rectangulatus sp. nov., male:A–B. head and pronotum: A. dorsal view; B. lateral view; C–F. apex of abdomen: C. dorsal view; D. ventral view; E. lateral view; F. apico-lateral view; female: G. subgenital plate; H. hind femur in lateral view; I. ovipositor in lateral view.