Bianigryllacris Cadena-Castañeda, 2019

Cadena-Castañeda, Oscar J., 2019, A proposal towards classification of the Raspy Crickets (Orthoptera: Stenopelmatoidea: Gryllacrididae) with zoogeographical comments: An initial contribution to the higher classification of the Gryllacridines, Zootaxa 4605 (1), pp. 1-100 : 38

Bianigryllacris Cadena-Castañeda n. gen.

Diagnosis: Small to medium size for the family (14–25 mm.) ( Fig. 156 ). Megacephalic condition present, space between antennal sockets 2.5–3 times as wide as scape, without lateral carinae, ocelli inconspicuous ( Fig. 157 ). Fore coxa with an unarticulated spine, legs moderately short and robust with four or five pairs of movable ventral spines on fore and middle tibiae (that spines are rather short and including a pair of apical spurs). Wingless species. Second and third abdominal tergites with stridulatory teeth on lateral margins; 9 th tergite enlarged, cucculliform, apex split ( Fig. 158 ); subgenital plate without styli ( Fig. 159 ); cerci short. Female abdomen with unspecialized tergites; genital plate broad and long; ovipositor very short (as long as the half of hind femora), thin, smooth and curved upwards ( Fig. 160 ).

Included species: Type species: Bianigryllacris trilobus (Bian & Shi, 2014) n. comb. (Before in Apotrechus ) and seven additional species: B. bilobus (Guo & Shi, 2012) n. comb., B. digitatus ( Liu & Bi, 2008) n. comb., B. fallax ( Liu & Bi, 2008) n. comb., B. nigrigeniculatus ( Liu & Yin, 2002) n. comb., B. parvospinus ( Liu & Yin, 2002) n. comb., B. quadratus ( Li & Liu, 2015) n. comb. and B. transversus ( Liu, Bi & Zhang, 2010) n. comb. (all this species before in Apotrechus ).

Etymology: Dedicated to Xun Bian as a recognition to his contributions to Chinese raspy crickets, plus typical termination— gryllacris common to genera of this family.

Comparison: This new genus is very close with Apotrechus and Apterolarnaca ; these three genera have a short ovipositor ( Figs. 160 ), and male terminalia with modifications, subgenital plate without styli and the species are wingless. Apotrechus and Bianigryllacris n. gen. have megacephalic condition present ( Figs. 157, 161 ) and Apterolarnaca not ( Fig. 165 ); these two genera differ by: the genital plate of Apotrechus males does not have a deep notch, and the 10 th tergite is as in Bianigryllacris ( Figs. 158, 162 ). Female ovipositor of Apotrechus species is shorter and less thin than in the new genus ( Fig. 164 ).

Distribution: China.

Comments: The species included in this new genus are all the known Apotrechus species from continental Asia, to date only recorded to China. The diagnosis here provided was compiled from Guo et al., 2012; Bian et al., 2014 and Li et al., 2015 and complemented with other additional characters.

Figures

FIGURES 156–165. Diagnostic characters to Apotrechae n. group. 156–160. Bianigryllacris n. gen. 156. Habitus of B. parvospinus n. comb. (Draw from Guo and Shi, 2012). 157–160. B. trilobus (draw from Bian et al., 2014). 157. Frons. 158. Male terminalia in dorsal view. 159. Male subgenital. 160. Ovipositor. 161–163. Apotrechus illawarra (draw from Rentz & John, 1990). 161. Frons. 162. Abdomen tip in dorsal view. 163. Male subgenital plate. 164. Ovipositor. 165. Frons of Apterolarnaca quadrimaculata (Bian et al., 2016).