Erexitonemobius bellus He & Ma, 2021

He, Zhixin, Zhang, Tao & Ma, Libin, 2021, Crickets of subfamily Nemobiinae Saussure, 1877 (Orthoptera: Grylloidea; Trigonidiidae) from China with descriptions of new genera and new species, Zootaxa 5011 (1), pp. 1-70 : 19-22

Erexitonemobius bellus He & Ma , sp. n.

( Figs. 16–18 )

Type material. Holotype. China: Male, Xizang, Motuo, Beibeng , vi-1-2019, Libin Ma coll. ( SNNU) . Paratypes. 2 females, same information as holotype.

Description. Male. Body size small. Head small, slightly wider than the anterior of pronotum. Rostrum two times wider than antennal scape. Median ocellus oval-like and smallest of the three, lateral ocelli round. Eyes rather large. Postclypeus transverse wide, anteclypeus medially concave. Apical joint of maxillary palpi slightly longer than the third, depressed and widened, with rounded apex; apical joint of labial palpi rod-like, longer than remainder sections, depressed and widened. Pronotum transverse wide, trapezoidal; anterior and posterior margins straight, posterior margin wider than the anterior, and middle of both lateral edges slightly concave. Tegmen bearing an oblique vein and three chord veins. Apical region reduced, lateral region bearing four Sc branches. Fore tibia only possessing external tympanum, oval-like. Hind tibia bearing three dorsal spurs outside and four inside, the basal two of the inside stubby; and three apical spurs on both sides respectively, basal one of the outside rather long and proximally expanded.

Genitalia. Epiphallus medially narrower than sides, lateral lobe extremely extruded and exceeding ectoparamere. Ectoparamere shaped as crab pincer and pointed inward.

Female. Similar to male but tegmina convex with longitudinal veins. Area between primary veins shiny and smooth, almost without transverse vein. Ovipositor blade-like.

Coloration. Body colored dark brown. Hind femur yellowish green dorsally with three white spots; hind tibia yellowish brown. Occiput ornamented with six dark stripes; fourth and half of fifth segment of maxillary palpi colored brown, the remainders colored dark brown.

Measurements (mm). Male. BL 5.23, HW 1.42, PL 1.25, TL 3.19, HFL 3.92. Female (n=2). BL 5.36±0.41, HW 1.42±0.15, PL 1.30±0.24, TL 2.41±0.36, HFL 4.14±0.48, OL 2.23±0.26.

Etymology. The name refers to the beautiful appearance of the species.

Genus Fibunemobius He & Ma , gen. n.

( Figs. 19–21 )

Type species: Fibunemobius tamquam sp. n., here designated.

Diagnosis. Body size small, yellowish brown. Tegmen bearing an oblique vein and three chord veins. Mirror separated into two cells. Apical region reduced, lateral region bearing four Sc branches. Fore tibia only possessing external tympanum, elongate oval-like. Hind tibia bearing four dorsal spurs outside and three inside, the first one of the inside stubby and far away from others; apical spurs two on both sides respectively. Male genitalia ( Fig. 21 ): the middle of epiphallus deeply concave, lateral lobe inward curved and covered by upper of ectoparamere. Ectoparamere shaped as crab pincer and pointed inward.

Etymology. The name refers to the ectoparamere being shaped as a crab pincer.

Included species. Type species only.

Comparison. Fibunemobius is very similar to Pteronemobius in body shape, color and quantity of spurs on hind tibia, but has different male genitalia. This genus is also similar to Claranemobius in male genitalia, but differs in the number of spurs of hind tibia in this subfamily. It differs from other genera of Nemobiinae in male genitalia.

Figures

FIGURE 16. E. bellus sp. n. Habitus (alive) in field. A. Male. B. Female.

FIGURE 17. Habitus photographs of E. bellus sp. n. A. Male. B. Female. Scale bar: 2 mm.

FIGURE 18. Male genitalia of E. bellus sp. n. A. Dorsal view. B. Lateral view. C. Ventral view.

FIGURE 19. F. tamquam sp. n. Habitus of male (alive) in field.

FIGURE 20. Habitus photographs of F. tamquam sp. n. A. Male. B. Female. Scale bar: 2 mm.

FIGURE 21. Male genitalia of F. tamquam sp. n. A. Dorsal view. B. Lateral view. C. Ventral view.