Gryllacris (Gryllacris) sok, 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 : 49

Gryllacris (Gryllacris) sok sp. nov.

Figs. 10J , 12F , 16J , 17G

Material examined. Holotype (female): Thailand: Surat Thani, Khao Sok , elev. 150 m (8°55'N, 98°30'E), 26.i.1997, leg. S. Ingrisch— 1 female (Bonn ZFMK).

Diagnosis. A specimen of this species was already reported as “ G.? peracca “ by Gorochov 2007 with one female from the same locality. The specimen from Khao Sok differs from G. peracca by narrower tegmina, the shape of the female subgenital plate being without apical incision, and by a shorter ovipositor. The female subgenital plate is similar to that of G. signifera but the apical margin is not bilobate but only little concave and the median styliform process longer and extended closer to tip. G. sok sp. nov. also differs by larger wings with markedly longer tegmen and hind wings, the latter are also more extended, with greater surface, by the color pattern on pronotum that is less pronounced (light instead of black), and by coloration of the face: brown with light marks and white ocelli instead of more or less uniformly light color.

Description. Medium sized species ( Fig. 10J ). Head: Face oval; forehead nearly smooth; fastigium verticis wider than scapus; ocelli distinct, of light color; subocular furrow weak ( Fig. 12F ).

Wings surpassing hind knees and almost reaching middle of stretched hind tibia ( Fig. 10J ). Tegmen: Radius releases RS behind basal third, both veins forked near tip. Media anterior fused in basal area with radius; media posterior absent; cubitus anterior divides behind basal third into CuA1 and CuA2; cubitus posterior singlebranched and free throughout; with 4 anal veins.

Legs: Fore coxa with a long 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 10 external and 6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color light brown; vertex and pronotum with light and medium brown pattern and with dark strokes, rim of pronotum dark brown. Legs of general color. Face medium dark brown with yellowish ocelli, below ventro-posterior margin of eyes with light bands; labrum dark brown. Tegmen semi-transparent yellow with yellowish brown veins and pale veinlets, darker towards base; hind wing semi-transparent white or ochre with brownish main veins and blackish brown cross-veins.

Male unknown.

Female. Seventh abdominal sternite unmodified. Subgenital plate about flat pear-shaped; in basal two thirds very wide with convex and strongly converging lateral margins, in apical third with subparallel but slightly convex lateral margins, apex faintly bilobate, with a faint medial furrow; all margins with distinct rim; greatest part of basal surface membranous ( Fig. 16J ). Ovipositor of medium length; curved, most strongly in subbasal area; margins faintly approaching; dorsal margin with a slight expansion before tip ( Fig. 17G ).

Measurements (1 female).—body w/wings: 40; body w/o wings: 25; pronotum: 6; tegmen: 28; tegmen width: 9; hind femur: 18; antenna: 150; ovipositor: 15 mm.

Figures

FIGURE 10. Genus Gryllacris: Habitus dorsal view: A–B, G. (P.) ovulicauda sp. nov. male holotype (A) and female paratype (B); C, G. bancana Karny, 1930 male; D, G. v. vittata Walker, 1869 female holotype; E–F, G. s. signifera (Stoll, 1813) male (E) and female (F); G, G. f. fuscifrons Gerstaecker, 1860 male; H–I, G. obscura cambodiae Gorochov, 2007 female (H) and male (I); J, G. sok sp. nov. female holotype. Scales 10 mm.

FIGURE 12. Genus Gryllacris: Face: A, G. (Pardogryllacris) ovulicauda sp. nov. male holotype; B–C, G. obscura cambodiae Gorochov, 2007 male (B) and female (C); D, G. f. fuscifrons Gerstaecker, 1860 female holotype; E, G. s. signifera (Stoll, 1813) male; F, G. sok sp. nov. female holotype; G, G. incornuta sp. nov. male holotype; H, G. bancana Karny, 1930; I, G. o. obscura Brunner, 1888; J, G. v. vittata Walker, 1869 female holotype; K, G. kinabaluensis Griffini, 1915 female; L, G. (P.) longiloba Gorochov & Dawwrueng, 2015 female; M, G. (P.) lineolata menzeli (Karny, 1924) male; N, G. (P.) l. lineolata Serville, 1838 male; O, G. (Gigantogryllacris) bilineata sp. nov. male holotype; P, G.(Gi.) ligulata sp. nov. male holotype.

FIGURE 16. Genus Gryllacris: A–B, G. s. signifera (Stoll, 1813); C–D, G. o. obscura Brunner, 1888; E–F, G. obscura cambodiae Gorochov, 2007; G–H, G. peracca Karny, 1923: holotype of G. kledangensis Karny, 1923 (G) and holotype of G. lombokiana Karny, 1926 (H); I, G. v. vittata Walker, 1869 holotype; J, G. sok sp. nov. holotype; K, G. (Pardogryllacris) ovulicauda sp. nov. paratype; L–M, G. kinabaluensis Griffini, 1915; N–O, G. f. fuscifrons Gerstaecker, 1860 (O, holotype).— Female subgenital plate in ventral (A–C, E, H–I, K–L, N–O), lateral (F, M), oblique lateral (D), and latero-ventral view (G, J).

FIGURE 17. Genus Gryllacris: A, G. (Pardogryllacris) ovulicauda sp. nov. paratype; B, G. o. obscura Brunner, 1888; C, G. peracca Karny, 1923: holotype of G. kledangensis Karny, 1923; D, G. obscura cambodiae Gorochov, 2007; E, G. s. signifera (Stoll, 1813); F, G. (P.) longiloba Gorochov & Dawwrueng, 2015; G, G. sok sp. nov. holotype; H, G. f. fuscifrons Gerstaecker, 1860 holotype; I, G. kinabaluensis Griffini, 1915; J–K, G. (P.) l. menzeli (Karny, 1924); L, G. (P.) longiloba Gor. & Dawwr., 2015; M–N, G. (P.) l. lineolata Serville, 1838—Female habitus lateral view (A–D, J), ovipositor (E–I), female subgenital plate in ventral view (K–L, N), subgenital plate with base of ovipositor in lateral view (M).