Apterolarnaca (Bianigryllacris) xinganensis, Lu & Zhang & Bian, 2022

Lu, Xiangyi, Zhang, Qianwen & Bian, Xun, 2022, Contribution to the knowledge of Chinese Gryllacrididae (Orthoptera) VII: Review the genus Apterolarnaca Gorochov, 2004, Zootaxa 5115 (3), pp. 381-396 : 391-396

Apterolarnaca (Bianigryllacris) xinganensis sp. nov.

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Figures 9–12

Description. Male. Body medium. Fastigium verticis wider than scape. Face with sparse punctures ( Fig. 9A ). Ocelli indistinct.

Pronotum with anterior margin slightly projecting, posterior margin faintly concave ( Fig. 9B ); lateral lobes longer than high, anterior angle rounded, posterior angle widely rounded ( Fig. 9C ).

Fore coxae swollen with 1 spine ( Fig. 9C ). Fore and middle femora unarmed on ventral surfaces, hind femora with 7–10 internal and 2–5 external spines on ventral surface. Fore and middle tibiae ventrally with 4 pairs of spurs and 1 pair of apical spurs, middle tibiae with 1 internal spine on dorsal surface. Hind tibiae with 3–4 internal and 4–6 external spines on dorsal surface, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs.

Second and third abdominal tergite each with two rows of stridulatory pegs ( Fig. 9D ). Posterior margin of eighth abdominal tergite arched projected in the middle area ( Fig. 9G ). Posterior margin of ninth abdominal tergite split along the middle, the lateral lobes curved downward and terminating into a spine ( Fig. 9H–I ). Tenth abdominal tergite interrupted in the middle. Cerci short, conical, its apices obtuse. Basal margin of subgenital plate almost straight, posterior margin with 1 median concavity ( Fig. 9H–I ), the lateral margins terminating into 1 short and stout process on both sides; without styli.

Female. Subgenital plate wider than long, posterior margin widely arched with middle area slightly projected ( Fig. 10G ). Ovipositor short, apical half gradually upcurved; dorsal and ventral margins smooth, apices obtuse ( Fig. 10E ).

Coloration. Body brownish yellow with blackish marks. Fastigium verticis, internal margins of antennal cavities and scape, flagellar segment and dorsal surface of head with blackish spots ( Figs. 9A , 10A ). Eyes black. Margins of pronotum blackish ( Figs. 9B , 10B ). Basal and apical areas of all tibiae with black rings. Spines of hind legs black.

Material examined. Holotype: male, Mao'ershan , Guangxi, October 5, 2021, coll. by Qianwen Zhang . Paratypes: 2 males and 1 female, Mao'ershan, Guangxi, October 5, 2021, coll. by Xiangyi Lu ; 1 female, the other information as holotype. Other specimens: 1 male, Mao'ershan , Guangxi, October 5, 2021, coll. by Jing Liu ; 1 male, Mao'ershan , Guangxi, October 2, 2021, coll. by Xiangyi Lu .

Measurements (mm). Male: BL 16.2–16.4, PL 3.7–4.1, HFL 8.1–8.6; Female: BL 19.9–20.1, PL 4.1–5.1, HFL 8.8–9.3, OvL 7.1–7.3.

Distribution. Guangxi (Mao'ershan).

Discussion. The new species differs from Apterolarnaca (Bianigryllacris) trilobus ( Bian & Shi, 2014) in: dorsal surface of abdomen without black band along the midline ( Fig. 12 ), apices of lateral lobes of male subgenital plate large ( Fig. 9H ), female subgenital plate wider than long ( Fig. 10G ). It differs from Apterolarnaca (Apterolarnaca) truncatoloba ( Li & Liu, 2015) ( Figs. 1–4 ) in: lateral lobes of male ninth abdominal tergite terminating into a pair of spines, posterior margin of male subgenital plate without median lobes, posterior margin of female subgenital plate slightly projected in the middle instead of truncate ( Fig. 10G ).

Etymology. The new species is named after the type locality.

Figures

FIGURE 1. Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015). Female from Damingshan, Guangxi: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. second and third abdominal tergites with stridulatory pegs in lateral view; E. apex of abdomen in lateral view; F. subgenital plate in ventral view; G. hind femur in lateral view.

FIGURE 2. Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015). Male: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D–H. apex of abdomen: D. ventral and lateral view, E. apical and slightly dorsal view, F. apical and ventral view, G. ventral view, H. lateral view.

FIGURE 3. Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015). Female from Jiuwanshan, Guangxi: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. second and third abdominal tergites with stridulatory pegs in lateral view; E. hind femur in lateral view; F. apex of abdomen in lateral view; G. subgenital plate in ventral view.

FIGURE 4. Female of Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) from Damingshan, Guangxi.

FIGURE 9. Apterolarnaca (Bianigryllacris) xinganensis sp. nov.. Male: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. dorsal and lateral view; D. second and third abdominal tergites with stridulatory pegs in lateral view; E–I. apex of abdomen: E–F. lateral view, G. dorsal view, H. ventral and slightly apical view, I. ventral view; J–K. left hind femur: J. external view, K. internal view.

FIGURE 10. Apterolarnaca (Bianigryllacris) xinganensis sp. nov.. Female: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. second and third abdominal tergites with stridulatory in lateral view; E. apex of abdomen in lateral view; F. left hind femur in lateral view; G. subgenital plate in ventral view.

FIGURE 11. Apterolarnaca (Bianigryllacris) xinganensis sp. nov.. Female: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. apex of abdomen in lateral view; E. subgenital plate in ventral view.

FIGURE 12. Habitus of Apterolarnaca (Bianigryllacris) xinganensis sp. nov.. A–C. male; D. female.