Metriogryllacris (Metriogryllacris) hamata, Zhang & Pang & Bian, 2022

Zhang, Qianwen, Pang, Siyu & Bian, Xun, 2022, Contribution to the knowledge of Chinese Gryllacrididae (Orthoptera) XII: Notes on the Chinese Metriogryllacris Karny, 1937, Zootaxa 5213 (1), pp. 36-48 : 42-45

Metriogryllacris (Metriogryllacris) hamata sp. nov.

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Figures 6–7 , 8A , 9A–D

Diagnosis. The new species differs from Metriogryllacris (Metriogryllacris) permodesta (Griffini, 1914) ( Liu et al., 2021: Figs. 3–6 ) in: the hooks of male ninth abdominal tergite small and widely separated from each other, basal area of the hook narrow in lateral view ( Fig. 6H ); the sclerotized areas of copulatory depressions of female seventh sternite shorter, widely separated from each other with median furrow ( Fig. 7F ).

Description. Male. Face nearly smooth with scattered impressed dots; fastigium verticis distinctly wider than scapus; ocelli indistinct ( Fig. 7A ). Wings reaching eighth abdominal tergite. Tegmina: In left tegmen ( Fig. 9A ), radius forks into two branches before apical third of tegmen, R forked near apical area; MA free from base, then fused with R in short distance and then again divided; media posterior absent; cubitus undivided, free throughout. While right tegmen ( Fig. 9B ), radius releases RS about seven tenths of tegmen; media anterior leaning on radius; media anterior free from base, which divides into two branches about basal third of tegmen, the first branch receives a short connection branch from MA, but remains single-branched as MP+CuA1. Both tegmina: Cubitus posterior undivided, free throughout; with 3 anal veins. Fore coxae with 1 small spine. Fore and middle tibiae ventrally with 4 pairs of spines and 1 pair of apical spines; middle tibiae with 1 internal spine on dorsal surface. Hind femora with 10–13 internal and 9–11 external spines on ventral surface; tibiae with 4 internal and 6 external spines on dorsal surface, ventral surface with 1 pair of subapical spines, apices with 1 pair of dorsal spines and 2 pairs of ventral spines. Second and third abdominal tergites each with 2 rows of stridulatory pegs ( Fig. 6D ). Eighth abdominal tergite prolonged to backward and ventrad. Ninth abdominal tergite semicircular, ventral margin with 1 pair of small hooks ( Fig. 6E, H ) and separated from each other ( Fig. 6F–G ), with narrow bases ( Fig. 6F, H ). Subgenital plate wider than long, the lateral margins convex; apical area projected, subtrapezoidal, posterior margin almost straight with faintly concave in middle; styli inserted at the lateral constriction ( Fig. 6G ).

Female. Tegmina: Radius with two branches, both forked near tip ( Fig. 9C ). In left tegmen ( Fig. 9A ), media free from base, cubitus anterior forks into two veins before middle of tegmen ( Fig. 9C ). In right tegmen, media divides into two branches behind middle of tegmen, cubitus anterior single-branched ( Fig. 9D ). Both tegmina: Cubitus posterior undivided, free throughout; with 3 anal veins. Hind femora ventrally with 10–13 internal and 11–12 external spines; tibiae with 6 pairs of dorsal spines. Ventral surface of seventh abdominal sternite concave with convex converging lateral margins, posterior margin of the concave widely separated by a wider furrow along the midline and the lateral margins obviously sclerotized, at tips with 1 copulatory depression on each side ( Fig. 7F ); it follows a membranous zone which connected with subgenital plate. Subgenital plate wider than long, posterior margin widely rounded with faintly concave in middle. Ovipositor short, apart from subbasal curvature straight, apices obtuse; basal areas of ventral valvulae with 1 pair of long spine-shaped lateral lobes which directing downward and 1 pair of short processes ( Fig. 7E–F ).

Coloration. Body yellow green ( Fig. 8A ). Eyes black. Margins of pronotum and tegmina brown. Dorsal surfaces of eighth and ninth abdominal tergites black. Hooks of male ninth abdominal tergite and sclerotized areas of female seventh abdominal sternite black.

Material examined. Holotype: male, Wanggangshan, Qinzhou , Guangxi, August 15, 2022, coll. by Qianwen Zhang and Shan Li . Paratype: 1 female, Wanggangshan, Qinzhou, Guangxi, August 14, 2022, coll. by Qianwen Zhang and Shan Li .

Measurements (mm). Male: BL 17.49, PL 4.19, TL 12.57, HFL 9.17; Female: BL 17.47, PL 5.05, TL 12.94, HFL 9.82, OvL 8.51.

Distribution. Guangxi (Qinzhou).

Etymology. The new species name derives from the male ninth abdominal tergite with 1 pair of small processes which hooked in lateral view.

Figures

FIGURE 3. Metriogryllacris (Metriogryllacris) nigrilimbis Liu & Bian, 2021. Male: A. head in frontal view; B–C. head and pronotum: B. lateral view, C. dorsal view; D. second and third abdominal tergites in lateral view; E–H. apex of abdomen: E. apical view, F. ventral view, G. lateral and slightly ventral view, H. lateral view.

FIGURE 4. Metriogryllacris (Metriogryllacris) nigrilimbis Liu & Bian, 2021. Female: A. head in frontal view; B–C. head and pronotum: B. lateral view, C. dorsal view; D. second and third abdominal tergites in lateral view; E–F. apex of abdomen: E. lateral view, F. ventral view.

FIGURE 5. Metriogryllacris (Metriogryllacris) obscurata sp. nov. Male: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. second and third abdominal tergites in lateral view; E–H. apex of abdomen: E. lateral view, F. apical view, G. ventral view, H. dorsal view.

FIGURE 6. Metriogryllacris (Metriogryllacris) hamata sp. nov. Male: A. head in frontal view; B–C. head and pronotum: B. dorsal view, C. lateral view; D. second and third abdominal tergites in lateral view; E–H. apex of abdomen: E. lateral view, F. apical view, G. ventral view, H. lateral and slightly ventral view.

FIGURE 7. Metriogryllacris (Metriogryllacris) hamata 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 in lateral view; E–F. apex of abdomen: E. lateral view, F. seventh abdominal sternite and subgenital plate in ventral view.

FIGURE 8. Habitus of Metriogryllacris spp. A. Metriogryllacris (Metriogryllacris) hamata sp. nov.; B–D. Metriogryllacris (Metriogryllacris) permodesta (Griffini, 1914); A–B. male; C–D. female.

FIGURE 9. Tegmina of Metriogryllacris spp. in dorsal view. A–D. Metriogryllacris (Metriogryllacris) hamata sp. nov.; E–F. Metriogryllacris (Metriogryllacris) bimacula Yu, Liu & Bian, 2022; A, C, E. left tegmen; B, D, F. right tegmen; A–B. male; C–D. female.