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

Zhang, Qianwen, Lu, Xiangyi & Bian, Xun, 2022, Contribution to the knowledge of Chinese Gryllacrididae (Orthoptera) IX: One new species of Apterolarnaca Gorochov, 2004 from Guangxi with description of female Apterolarnaca (Apterolarnaca) huanglianensis Bian & Lu, 2021, Zootaxa 5178 (4), pp. 391-396 : 394-396

Apterolarnaca (Bianigryllacris) spiculoproceris sp. nov.

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Figures 3 , 4C–D

Diagnosis. The female subgenital plate transverse, with posterior margin truncate ( Fig. 3J ), the apico-lateral angles spine-shaped ( Fig. 4C–D ).

Description. Female. Body small. Fastigium verticis wider than scape. Face with very fine transverse “riffles” and sparse punctures; fastigium frontis separated from fastigium verticis by a very fine suture ( Fig. 3A ). Ocelli indistinct.

Pronotum with anterior margin arched, posterior margin nearly straight ( Fig. 3B ); lateral lobes longer than high, anterior angle rounded, posterior angle slightly extending downwards ( Fig. 3C ).

Fore coxae with 1 spine. Fore and middle femora unarmed on ventral surfaces, middle femora with 1 apicointernal spine, hind femora with 11–14 internal and 4 external spines on ventral surface. Fore and middle tibiae with 5 pairs of ventral spurs, including 1 pair of apical ones; hind tibiae with 5–6 internal and 6 external spines on dorsal surface, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs.

Second and third abdominal tergites each with two rows of stridulatory pegs ( Fig. 3E ). Subgenital plate inverted trapezoidal in ventral view ( Fig. 3J ), wider than long, the apico-lateral angles spine-shaped and curved dorsad ( Fig. 3G–H ). Ovipositor short and strongly curved upwards, with dorsal and ventral margins smooth, its apices obtuse ( Fig. 3H ); with a pair of ovoid, lateral sclerites at base of ventral valvulae, which projecting outwards ( Fig. 3J ).

Male. Unknown.

Coloration. Body yellowish brown. Ventral margins of antennal cavities blackish, face with 1 pair of blackish spots at fronto-clypeal suture. Eyes blackish brown. Doral surface of head with one large black spot behind antenna on each side, between area of antennae with irregular black spot along the midline ( Fig. 3B ). Margins of pronotum blackish ( Fig. 3C ). Apical areas of femora blackish, basal and apical areas of tibiae of all legs blackish; dorsal spines of hind tibiae black ( Fig. 3D ). Dorsal surface of abdominal tergites with longitudinal blackish band along the midline.

Material examined. Holotype: female, Wutaishan, Leye , Guangxi, August 29, 2021, coll. by Xiangyi Lu.

Measurements (mm). Female (Holotype): BL 21.6, PL 3.7, HFL 9.5, OvL 6.3.

Distribution. Guangxi (Leye).

Etymology. The new species name refers to the female subgenital plate with a spinous process at each apicolateral angle of posterior margin.

Discussion. The new species is similar to Apterolarnaca (Bianigryllacris) xinganensis Lu, Zhang & Bian, 2022 and Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) in coloration, but differs from them by: posterior margin of female subgenital plate almost straight ( Fig. 3J ), the apico-lateral angles spinous projected ( Fig. 4C–D ). While Apterolarnaca (Bianigryllacris) xinganensis Lu, Zhang & Bian, 2022 , posterior margin of female subgenital plate widely arched with middle area slightly projected ( Lu et al., 2022: Fig. 11E). The female subgenital plate of Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) has rounded apico-lateral angles on posterior margin ( Fig. 4B ).

Figures

FIGURE 3. Apterolarnaca (Bianigryllacris) spiculoproceris sp. nov.. Female: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. left hind femur in ventral and lateral view; E. second and third abdominal tergites with stridulatory pegs in lateral view; F–J. apex of abdomen: F. dorsal view, G–H. lateral view, I. ventro-lateral view, J. ventral view.

FIGURE 4. Apices of female abdomens of three Apterolarnaca species. A. Apterolarnaca (Bianigryllacris) xinganensis Lu, Zhang & Bian, 2022 (from Lu et al., 2022: Fig. 10E); B. Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) (from Lu et al., 2022: 1E); C–D. Apterolarnaca (Bianigryllacris) spiculoproceris sp. nov.; A–C. lateral view; D. vento-lateral view.