Aancistroger elbenioides ( Karny, 1926b ), Karny, 1926

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: 100-101

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Aancistroger elbenioides ( Karny, 1926b )


Aancistroger elbenioides ( Karny, 1926b)  

Figs. 32 A–B, 33G–I, 34A –C

Material examined. Thailand: Loei, Na Haeo Field Research Station , (17°27'N, 101°3'36''E), 5–12.v.2001, leg. J. Constant & P. Grootaert— 1 female, 2 males (Brussels RBINS) GoogleMaps   ; same locality, 15–19.v.2003, leg. J. Constant, K. Smets & P. Grootaert— 1 female (Brussels RBINS) GoogleMaps   .

Description. Small to medium sized species. Face narrow ovoid; forehead nearly smooth; fastigium verticis little wider than scapus; ocelli visible but little distinct ( Fig. 32B). Abdominal tergites two and three each with two rows of stridulatory pegs (10–12, 16–19; 19, 26; n = 2 males).

Wings reaching or surpassing stretched hind tibiae ( Fig. 34A). Tegmen ( Fig. 32A): Radius with two branches, both forked near tip; media anterior sub-fused in basal quarter with radius (veins attached to each other, but recognizable as two veins); cubitus anterior at base single branched, after division into two branches, the anterior branch makes a curvature and receives a short connection branch from MA, shortly after it divides into MP and CuA1, which are running parallel; CuA2 without further division; cubitus posterior undivided, free throughout; with 3–4 anal veins, the last branch short, arising from a common stem with preceding branch.

Legs: Fore coxa with a small 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 6–8 external and 5–6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one preapical spine; with 3 apical spurs on both sides; dorso-internal apical spur ♀ 13:9 (= 1.44x), ♂ 13:9.5 (= 1.37x) times longer than dorso-external spur ( Fig. 34C).

Coloration. General color uniformly yellowish brown; abdominal tergites greyish red. Face uniformly yellowish or greyish brown; compound eyes black. Tegmen semitransparent yellow, along fore and hind margins whitish; veins yellow; hind wing semitransparent white; veins yellow, cross-veins pale.

Male. Eighth abdominal tergite of normal length. Ninth abdominal tergite not globular, only lateral margins curved ventrad; red; apical margin in middle subtruncate, faintly bi-concave; on both sides with a long downcurved spine that is at base wide and round and light yellow, in apical two thirds compressed and dark brown; tip acute ( Figs. 33 G–H). Tenth abdominal tergite almost hidden beneath ninth tergite; largely membranous except for areas around bases of cerci. Epiproct semi-circular with wide median groove; paraproctes compressed, setose on apical surface. Subgenital plate little wider than long, with medial furrow, lateral margins convex, not approaching, apical margin subtruncate; styli fused with subgenital plate, visible as short cones at apico-lateral angles of plate ( Fig. 33I).

Female. Seventh abdominal sternite with oval, marginated groove at very base; otherwise of normal shape. Subgenital plate separated by a rather short membranous area from preceding sternite; with convex lateral margins and concave apical margin; surface flat in middle, upcurved on both sides ( Fig. 34B). Base of ovipositor normal. Ovipositor rather short, substraight but with convex dorsal and concave ventral margin; tip subobtuse ( Fig. 34A).

Measurements (2 males, 2 females).—body w/wings: male 31, female 36; body w/o wings: male 16–17, female 20–21; pronotum: male 3.0–3.5, female 3.3–3.5; tegmen: male 26.5–27.0, female 29.0–29.5; tegmen width: male 8, female 8; hind femur: male 8.5, female 10.0–10.5; antenna: male 80–90; ovipositor: female 10.5 mm.


Royal Belgian Institute of Natural Sciences