Angustogryllacris bibulbata, 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 : 111-113

Angustogryllacris bibulbata sp. nov.

Figs. 37 A–M

Material examined. Holotype (male): East Malaysia: Sabah, Mt. Kinabalu, Poring , elev. 500–700 m (6°5'N, 116°33'E), 28.i.1993, leg. A. Floren (tree nr. 62)—(Bonn ZFMK).

Other specimens: East Malaysia: Sabah: same locality as holotype, 28.i.1993, leg. A. Floren (tree nr. 62)— 1 female (paratype) (Bonn ZFMK); same locality, 12.ii.1993, leg. A. Floren (tree nr. 9)— 2 females (paratypes) (Bonn ZFMK) ; Bergil, (6°13'7.21''N, 116°44'13.54''E), 2006, leg. A. Floren (tree B7)— 1 female (paratype) (Bonn ZFMK) ; same locality, 2006, leg. A. Floren (tree B42)— 1 female (paratype) (Bonn ZFMK) .

Diagnosis. This is so far the only species of the genus Angustogryllacris . The diagnostic characters are already mentioned in the generic diagnosis.

Description. Small to medium sized species. Head: Face not particularly large; in frontal view roughly oval; forehead nearly smooth; fastigium verticis about as wide as scapus; ocelli indistinct ( Fig. 37D ). Abdominal tergites two and three each with two rows of stridulatory pegs (5–7, 9–14; 12–13, 15–17; n = 1 male, 4 females; Fig. 37L ).

Wings shortened, lanceolate; not overlapping dorsally ( Figs. 37 A–C). Tegmen little shorter or longer than abdomen but not fully reaching hind knees; venation of tegmen little variable: RS divides rather late from radius stem, only one of both veins forked at tip or both veins unforked; media anterior free from base but at very base with a common stem with cubitus anterior, sometimes common stem prolonged to subbasal area; media posterior arises from MA or absent; cubitus posterior with separate stem, single branched, free throughout; with three, rarely four anal veins.

Legs: Fore coxa with 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 4–7 external and 12–16 internal small spines on ventral margins, little increasing in size towards posterior end; hind tibia with few small spaced spines on both dorsal margins increasing in size from base to end, on external margin only spines in apical area, on internal margin over whole length, ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color unicolored pale brownish (originally conserved in alcohol); with some black ornaments on apical segments of abdomen, hind femur and tibiae. Face unicolored yellowish brown. Tegmen yellowish transparent, veins of about same color; hind wing whitish transparent with yellowish veins.

Male. Ninth abdominal tergite with lateral margins strongly narrowing posteriorly, in about apical third nearly parallel-sided and in dorsal view apically truncate; on each side of apical margin with a short bulbous projection bent ventrad and carrying at tip a sickle-shaped, black process ( Figs. 37H , J–K). Subgenital plate little wider than long, with lateral margins convex, apical margin concave; styli small, sitting at latero-apical angles of plate ( Fig. 37I ). Phallus membranous.

Female. Seventh abdominal sternite with lateral areas membranous; sclerotised part narrower than preceding sternites and roughly shaped like an "8": in middle constricted and furrowed, basal and apical area wider; on each side at base of apical widening with a black oval pit open anteriorly ( Figs. 37 E–G). Subgenital plate in roughly basal half or more membranous, striated; apical area bent ventrad, forming a convex bulge. Ovipositor long and nearly straight, only in subbasal area little curved; about as long as or little longer than hind femur; at tip suddenly narrowing, subacute ( Fig. 37M ).

Measurements (1 male, 5 females).—body w/wings: male 14.5, female 16–30; body w/o wings: male 14, female 11–30; pronotum: male 2.8, female 2.5–3.2; tegmen: male 10.5, female 10.5–12.0; tegmen width: male ca 3 (curled), female 3.5; hind femur: male 9, female 9.8–11.0; antenna: male 80, female 70–90; ovipositor: female 10.5–12.0 mm.

Etymology. The name of the new species refers to the double swelling of the seventh abdominal sternite of female; from Latin bi- (two) and bulbos (bulb, swelling).

Figures

FIGURE 37. Angustogryllacris bibulbata gen. nov. & sp. nov.: A, Habitus female dorsal view; B, tegmen female, C, tegmen male; D, face; E–G, ventral view on female abdomen with seventh sternite and subgenital plate from specimens in alcohol (E– F) and after drying (G); H–K, male holotype, abdominal apex in apical (H), ventral (I), and oblique lateral view view (J), sickle-shaped process of ninth tergite greater enlarged (K); L, stridulatory pegs on 2nd and third abdominal tergites (front is left); M, ovipositor.