Gryllacris (Gryllacris) obscura cambodiae Gorochov, 2007

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 : 47-48

publication ID 10.11646/zootaxa.4510.1.1

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Gryllacris (Gryllacris) obscura cambodiae Gorochov, 2007


Gryllacris (Gryllacris) obscura cambodiae Gorochov, 2007 View in CoL

Figs. 10 View FIGURE 10 H–I, 12B–C, 13D–F, 16E–F, 17D

Material examined. Cambodia: Koh Kong, Tatai , (11°35'13''N, 103°5'50''E), 9–19.x.2016, leg. J. Constant & J. Bresseel (I.G.: 33.345 GTI project)— 1 female, 1 male (Brussels RBINS) GoogleMaps .

Discussion. A striking difference between the specimens from Cambodia as compared to specimens from Sumatra and Malay Peninsula is the greater distance between the transverse veins of the hind wings (that are bordered by dark bands) (also the G. obscura female figured in Gorochov 2007). Thus there are only about 7 rows of cross-veins with dark bands in the specimens from Cambodia while 8 or 9 in the specimens from Sumatra and Malay Peninsula. The hind wings of the Cambodian specimens give thus a rather light appearance compared to the dark, obscure appearance in G. obscura from Sumatra and Malay Peninsula. The female of this subspecies is described here for the first time. But considering the variation in coloration, the status of the female listed by Gorochov (2007) under G. o. obscura should be re-considered.

Description. Medium sized species ( Figs. 10 View FIGURE 10 H–I). Head: Face ovoid; forehead nearly smooth with scattered impressed dots and shallow transverse riffles; fastigium verticis hardly wider than scapus; ocelli visible but not very distinct; fastigium frontis separated from fastigium verticis by a faintly sinuate suture; subocular furrows present but shallow; sub-antennal furrows short, only near ventro-internal angle of antennal scrobae ( Figs. 12 View FIGURE 12 B–C).

Wings surpassing hind knees ( Figs. 10 View FIGURE 10 H–I). Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius, afterwards single branched; media posterior absent; cubitus anterior forks between basal third and 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 four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 6–9 external and 11–12 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 with three black spots; pronotum with hieroglyphic marks; genicular areas and tibiae of all legs indistinctly and irregularly darkened; tips of male and female subgenital plate, male styli, and part of cerci of both sexes black. Face yellowish brown with indistinct medium brown flecks and with the following black marks: at top of fastigium verticis, margin of antennal scrobae and two small spots in the membranous area, very base of scapus; a small spot at lateral angles of labrum, tips of mandibles. Tegmen yellowish semi-transparent; main veins brown, darker towards base; cross veins little darker than surface, towards base more distinct; hind wing ochre to yellowish semi-transparent; main veins medium brown; cross veins, except along rim, black, bordered on both sides by dark brown bands.

Male. Eighth abdominal tergite strongly prolonged behind. Ninth abdominal tergite as described by Gorochov (2007) ( Figs. 13 View FIGURE 13 D–F).

Female. Seventh abdominal sternite unmodified, wider than long. Subgenital plate with widened basal area grooved at base followed by a stout angular bulge, interrupted in midline by a small, thin, bicornute sclerite; between wide basal and narrower apical area with a curved transverse furrow; apical area black with light dots, consisting of two oval swellings separated by a medial furrow; apical margin concave ( Figs. 16 View FIGURE 16 E–F). Ovipositor long, moderately curved, with faintly approaching margins; tip with a slight pre-apical expansion ( Fig. 17D View FIGURE 17 ).

Measurements (1 male, 1 female).—body w/wings: male 41, female 39; body w/o wings: male 28, female 30; pronotum: male 6.5, female 6.5; tegmen: male 29, female 27.5; tegmen width: male 10, female 10.5; hind femur: male 17.5, female 18.5; antenna: male 130, female 150; ovipositor: female 20.5 mm.


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