Phryganogryllacris nonangulata, 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 : 235-237

Phryganogryllacris nonangulata sp. nov.

Figs. 82 G–J, 83A–E, 84A–C

Material examined. Holotype (male): Vietnam: Tay Yen Tu Nat. Res., (21°11'10''N, 106°43'25''E), 7–11.vii.2013, coll. J. Constant & J. Bresseel (I.G. 32.454)—(Brussels RBINS).

Other specimens studied: Vietnam: Cat Ba N.P., (20°48'N, 107°0'20''E), 12–16.vii.2013, coll. J. Constant & J. Bresseel (I.G. 32.454)— 1 female (Brussels RBINS).

Diagnosis. The shape of the male abdominal apex is intermediate between that of P. superangulata Gorochov, 2005 and that of P. subangulata Gorochov, 2005 . The back surface of the ninth abdominal tergite is strongly oblique as in P. superangulata but the top is not angular but widely rounded, even more so than in P. subangulata . The apical projections are somewhat more approaching towards midline than in both other species and stouter than in P. subangulata but not as stout as in P. superangulata . The male subgenital plate in P. nonangulata has the medial process rather long but not surpassing the styli, with subparallel lateral margins and the apical margin subtruncate. In P. superangulata the medial process is shorter and with slightly bilobate apical margin, while in P. subangulata it is longer than in the new species and has approaching lateral margins, the apical margin slightly bilobate and little surpassing the styli. The female seventh abdominal sternite is prolonged and divided in midline from fore to hind margin by a triangularly widening membranous zone and has at both posterior-lateral angles a distinct pit. It is followed by a bulging membranous zone and a short, inconspicuous, membranous subgenital plate. This is similar but not identical to the situation in P. superangulata as figured in Gorochov (2005).

Description. Small to medium sized species. Head: Face narrow ovoid; forehead nearly smooth with scattered impressed dots; fastigium verticis hardly wider than scapus, separated by a transverse suture from fastigium frontis; ocelli visible but little distinct; subocular furrow shallow ( Figs. 83 D–E). Abdominal tergites two and three each with two rows of stridulatory pegs (4–7, 12–15; 16–18, 17–22; n = 1 female, 1 male; Fig. 84C ).

Wings almost reaching to about tip of stretched hind tibiae ( Figs. 82 G–H). Tegmen widest at beginning of apical third: Radius releases RS only in apical third of tegmen, both veins then forked again (in both, male and female); media anterior free from base but in subbasal area leaning on R, single-branched; cubitus anterior at base with a single branch that forks into two veins, the anterior branch makes a curvature, at top of curvature MP closely approaches (female) or fuses in a point with MA (male) and immediately separates again, shortly after that branch divides again into two parallel branches, MP and CuA1, while the posterior branch (CuA2) does not divide further. Cubitus posterior undivided, free throughout; with 3 anal veins (male) or with 4 anal veins, the last vein short and arising from a common stem with preceding vein (female).

Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 2–3 external and 5–6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides dorso-internal apical spur about 1.4 times longer than dorso-external spur ( Fig. 82J ).

Coloration. General color uniformly yellowish brown; legs with traces of green; probably a green species when alive. Face uniformly yellowish brown. Tegmen semi-transparent yellow, towards margins of lighter color, veins yellow; hind wing semi-transparent white; veins yellow, veinlets light grey.

Male. Eighth abdominal tergite of rather normal length. Ninth abdominal tergite little prolonged, in lateral view hind margin oblique with ventral area being more proximad than dorsal area; apical surface strongly bent down from dorsal surface; ventral margin truncate; from ventral area of baso-lateral surface on both sides with a rather large acute projection first curved mediad, then ventro-laterad ( Figs. 83 A–B). Epiproct small, triangular. Subgenital plate wide in basal area and with a long medial process with subtruncate tip; styli inserted at lateral angles of wide basal area and only little surpassing tip of medial process ( Fig. 83C ).

Female. Seventh abdominal sternite elongate, distinctly longer than preceding sternites; in about apical half depressed in middle and with fine transverse furrows. Subgenital plate short, lobular, completely membranous, only at baso-lateral angles with a small sclerotised pit with black external margin ( Figs. 84 A–B). Ovipositor rather short, moderately and regularly upcurved, with gradually approaching margins; tip subobtuse ( Fig. 82I ).

Measurements (1 male, 1 female).—body w/wings: male 26, female 27; body w/o wings: male 17.5, female 17; pronotum: male 2.8, female 3; tegmen: male 22, female 22.5; tegmen width: male 7.2, female 7; hind femur: male 10.5, female 10.5; antenna: female 90; ovipositor: female 9.5 mm.

Discussion. As the female has not been collected together with the male but in a different although not remote locality, it is not included in the type series.

Etymology. Named for the shape of the ninth abdominal tergite that is strongly sloping in posterior area but not angularly bent between dorsal and ventro-apical surface.

Figures

FIGURE 82. Genus Phryganogryllacris: A–C, P. extensa sp. nov. female holotype; D–F, P. gialaiensis fovealis ssp. nov. female holotype; G–J, P. nonangulata sp. nov. male holotype (G, J) and female (H–I); K–L, P. phryganoides thailandensis Gorochov, 2005 male.—Habitus dorsal view (A, D, G, H, K); habitus lateral view (B); abdomen apex and ovipositor (E, I); apical area of left hind tibia in dorsal view (C, F, J, L). Scales 10 mm.

FIGURE 83. Genus Phryganogryllacris: A–E, P. nonangulata sp. nov. holotype (A–D), female (E); F–H, P. phryganoides thailandensis Gorochov, 2005; I, P. gialaiensis fovealis ssp. nov. holotype; J, P. extensa sp. nov. holotype.—Male abdominal apex in lateral (A), apical (B, G) and ventral view (C, H); face (D–F, I–J).

FIGURE 84. Genus Phryganogryllacris: A–C, P. nonangulata sp. nov.; D, P. gialaiensis fovealis ssp. nov. holotype; E–G, P. extensa sp. nov. holotype; H, P. phryganoides thailandensis Gorochov, 2005.—Female end of abdomen with seventh sternite, subgenital plate and base of ovipositor in lateral (A, E) and ventral view (B, D, F); stridulatory pegs on second and third abdominal tergites, front is left (C, G–H).