Prosopogryllacris gamta, 2018

Ingrisch, Sigfrid, 2018, New taxa and records of Gryllacrididae (Orthoptera, Stenopelmatoidea) from South East Asia and New Guinea with a key to the genera, Zootaxa 4510 (1), pp. 1-278 : 83-84

Prosopogryllacris gamta sp. nov.

Figs. 28 H–L

Material examined. Holotype (female): Indonesia: Misool Islands , East Raja Ampat , River Gam upstream, Gamta village, 12–14 km NW, elev. 70–350 m (1°57'50''S, 130°11'9''E), 5.ii.2012, leg. D. Telnov (Erfurt NKME).

Diagnosis. The new species is characterized by the pattern of hind wing coloration that is restricted to the marginal area and the brown color includes the cross veins but not the longitudinal veins and includes light oval spots around the secondary longitudinal veins ( Fig. 28H ). This deviates from the normal situation in Eugryllacris where normally the cells are dark in middle and the cross-veins light, but it also does not agree with the situation in Gryllacris that has dark bands along the cross veins and the middle of the cells light. The abdominal appendages agree with the situation in Eugryllacris but would be of so far unique shape within that genus. The female subgenital plates terminates into long oval-triangular lobes little deviating from each other ( Figs. 28 J–K). The female seventh abdominal sternite is strongly setose as the preceding sternites and terminates into a membranous beam-like projection with bilobate tip ( Fig. 28J ). The color pattern of the hind wings of P. gamta sp. nov. resemble the situation in " Prosopogryllacris horvathi horvathi (Griffini, 1909) " but are more extended in the new species than in P. horvathi . Both species differ by the possession of spines on ventro-internal margin of hind femur in P. gamta said to absent in P. horvathi , but more important is the specific shape of the female seventh abdominal sternite that is prolonged from apical margin and divided into a ventral and a dorsal lobe, the ventral lobe has a slightly bifid tip and on underside a cone while the dorsal lobe is flat but little curved and fused with the surrounding membranous area while for P. horvathi the process of the seventh sternite is described as wide and long towards apex narrowing and rounded. The generic affiliation of the new species and of P. horvathi should be re-evaluated when males become available for study.

Description. Medium sized species. Head: Face ovoid, rather narrow; nearly smooth with scattered impressed dots and irregular wrinkles; fastigium verticis hardly wider than scapus, ocelli indistinct; fastigium frontis separated from fastigium verticis by a strong, straight suture; subocular furrows distinct but shallow ( Fig. 28I ). Abdominal tergites two and three with>3, 6; 6, 10 stridulatory pegs.

Wings surpassing hind knees and reaching to about mid length of ovipositor ( Fig. 28H ). Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius; media posterior absent; cubitus anterior forks before mid-length into two veins, CuA1 and CuA2; cubitus posterior undivided, free throughout; with 4 anal veins.

Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with 4 pairs of comparatively short ventral spines and 1 pair of smaller ventral spurs; hind femur with 7–9 external and 5 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one preapical spine each; with 3 apical spurs on both sides.

Coloration. General color uniformly brown with indistinct pattern. Face uniformly brown; only tips of mandibles black; compound eyes whitish. Tegmen yellowish semi-transparent, towards margins paler; veins and veinlets dark to light brown; hind wing semi-transparent white, veins dark to light brown; marginal area suffused with dark brown, the dark color is interrupted by oval light spot in the fields formed by the main veins and the cross veins.

Male unknown.

Female. Seventh abdominal sternite with a setose, at tip slightly bilobate projection covering base of subgenital plate. Subgenital plate wide at base and with distinctly concave lateral margins; with rather long, obtuse apical lobes, deviating from each other; with a very faint median carina ( Figs. 28 J–K). Base of ovipositor normal. Ovipositor of medium length, distinctly but not strongly curved dorsad, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 28L ).

Measurements (1 female).—body w/wings: 28; body w/o wings: 19; pronotum: 5.5; tegmen: 20; tegmen width: 7.5; hind femur: 15; ovipositor: female 13.5 mm.

Etymology. The new species is named after the type locality; noun in apposition.

Figures

FIGURE 28. A–G, Xanthogryllacris timoriensis (Karny, 1931): male (A–E), female (F–G); H–L, Prosopogryllacris gamta sp. nov. female holotype (H–K), not a type (L).—Habitus dorsal view (A, H) and lateral view (F), face (B, I), male abdominal apex in apical (C), dorsal (D) and lateral view (E), female abdominal apex with seventh abdominal sternite and subgenital plate in ventral (G, J) and lateral view (K), ovipositor (L). Scales 10 mm.