Aphanogryllacris sinustylata, 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 : 114

Aphanogryllacris sinustylata sp. nov.

Figs. 38 A–G

Material examined. Holotype (male): East Malaysia: Sabah, Tawau district, Tawau Hills , (4°24'N, 117°54'E), 6.ix.2009, leg. A. Floren (tree T60 [7T60])—(Bonn ZFMK).

Diagnosis. The new species is very similar to A. ustiterga Karny 1937 ; it differs by the male ninth tergite being furrowed on posterior side and at apex with a pair of long and narrow, slightly sinuate, transverse processes ( Fig. 38G ); subgenital plate with bicornute apico-medial lobe wider and shorter than in A. ustiterga , not reaching tip of styli ( Fig. 38F ), and by minor differences in the venation of tegmen. A. supraclipealis Karny, 1937 , also described from East Borneo has a uniform, unstructured, elongate-cylindrical pronotum while in A. sinustylata it is structured and shorter. From both other species, the new species differs by the rather long and sinuate apical processes of the male ninth abdominal tergite and by venation of tegmen; Karny (1937) mentions six post-cubital veins (to which he counts CuP and the anal veins) for A. ustiterga and A. supraclipealis while there are only three anal veins in A. sinustylata .

Description. Small species. Head: Face rather narrow; forehead nearly smooth; fastigium verticis distinctly wider than scapus; ocelli little distinct ( Fig. 38B ). Abdominal tergites two and three each with two rows of stridulatory pegs (>6 spaced,>12 very dense;>10 dense,>14 dense; ( Fig. 38C ).

Wings just surpassing hind femur ( Fig. 38A ). Tegmen with reduced parallel veins. Radius with a single posterior branch (RS) arising about in half length of tegmen that forks once near tip (left) or unforked (right tegmen); media and cubitus anterior with common base dividing at about end of basal quarter into M and CuA, before mid-length of tegmen M divides into MA and MP; after RS has arisen from R, it meets in a point (left tegmen) or fuses for about 1 mm (right tegmen) with MA before it frees again; cubitus posterior arises from a very short stem (less than 0.25 mm) with M+CuA, afterwards free and undivided; with 3 anal veins.

Legs: Fore coxa with 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 small spines on both ventral margins, with 6 external and 7–9 internal spines on ventral margins, increasing in size towards posterior end; hind tibia with spaced spines on both dorsal margins, ventral margins unarmed; with 3 apical spurs on both sides.

Coloration. General color brownish (originally conserved in alcohol). Face unicolored pale yellowish brown; compound eyes black. Tegmen yellowish transparent, veins darker; hind wing semitransparent, veins yellow.

Male. Ninth abdominal tergite posterior area strongly bent down, deeply furrowed in midline, furrow membranous, at ventral margin on each side of furrow with a narrow, little sinuate process with small acute spine at tip; processes directed laterally and crossing each other in middle ( Figs. 38 D–E, G). Tenth abdominal tergite narrow band-shaped, in middle with a large oval groove. Subgenital plate wide at base with converging lateral margins; styli inserted in about mid of plate length; narrow central part of plate almost as long as styli, with apex slightly bilobate ( Fig. 38F ). Phallus membranous.

Female unknown.

Measurements (1 male).—body w/wings: 14; body w/o wings: 10; pronotum: 3.5; tegmen: 10; hind femur: 7.5; tegmen width: 3 mm.

Figures

FIGURE 38. Genus Aphanogryllacris: A–G, A. sinustylata sp. nov. holotype male; H–M, A. nigritibiae sp. nov. holotype female.—Habitus dorsal view (A, H), do. lateral view (K), face (B, J), stridulatory pegs on 2nd and third abdominal tergites (front is right, C), male abdominal apex in dorsal (D), lateral (E), ventral (F) and apical view (G), ovipositor (I), female abdominal apex in apical (L) and ventral view (M).