Zalarnaca (Glolarnaca) elegantula, 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 : 253-256

Zalarnaca (Glolarnaca) elegantula sp. nov.

Figs. 92 A–G

Material examined. Holotype female. Vietnam: Hanoi prov., BaVi N.P., (21°4'4''N, 105°21'30''E), 25–29.vi.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)—(Brussels RBINS).

Diagnosis. Very similar to Zalarnaca (Glolarnaca) pulcherrima Gorochov, 2008 with regard to general habitus, coloration and overall shape of female subgenital plate plus the preceding sternite. It differs by the coloration of pronotum that has the black band along hind margin interrupted in middle and not extended to ventral margin, and only 4 separate spots on disc. More important are differences of the shape of female subgenital plate and the seventh abdominal sternite. The latter is longer, elevated from base to about mid-length, then suddenly declining to the posterior level and with a projection in midline and has the apical margin sinuate ( Fig. 92E ) instead of with rather regularly bulging surface and subtruncate (faintly concave in middle) apical margin in Z. pulcherrima . The subgenital plate is projecting ventrally and nearly rectangularly curved in middle instead of rather regularly curved in Z. pulcherrima and the two apical lobes are longer and more deeply separated from each other ( Fig. 92 D–E).

Description. Small species. Head: Face ovoid, surface matt, with very fine transverse riffles and impressed dots; fastigium verticis much wider than scapus; ocelli little distinct ( Fig. 92C ). Abdominal tergites two and three each with two rows of very minute stridulatory pegs (10, 12; 11, 12; n = 1; Fig. 92G ).

Wings about covering tip of abdomen ( Fig. 92A ). Tegmen: Radius releases RS behind mid tegmen, radius stem forked again near tip, on right tegmen R does not release RS but behind mid-length of tegmen M divides from one point into 3 veins (RS, MA and MP?). Media anterior free but fuses with radius for a short distance in subbasal area, CuA and CuP both remain single-branched and free throughout; with 7 anal veins, the last two weak, shortened and with common base.

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, all rather short compared to other genera; hind femur rather stout ( Fig. 92B ) with 11–15 external and 6–12 internal spines on ventral margins; hind tibia with spaced and very small spines on both dorsal margins, ventral margins with 3 apical spurs on both sides; without ventral preapical spine; hind tibia slightly curved.

Coloration. General color brown; vertex brown with 2 black spots along midline. Face dirty brown, on vertex with 5, below with 6 black spots; maxillary palpi yellowish. Pronotum brown with 2 large and 2 small black spots in anterior area of disc and in midline with an interrupted black band along hind margin including lateral area; legs black with brown tarsi and brown hind knees and other brown spots. Tegmen orange brown, in apical area semitransparent white; vein coloration intensifies from light yellow in apical area to blackish brown near base; hind wing semi-transparent white or faint yellowish, main veins dark brown, cross-veins yellowish brown.

Male unknown.

Female. Seventh abdominal sternite with nearly parallel lateral margins; disc almost rectangularly changes into lateral surface, only in basal area rounded; almost basal half with elevated surface, posterior margin of elevated area convex, but in midline with a conical extension until about 3/4 of sternite; apical margin of sternite undulated: convex on both sides and in middle, concave in between; apical and lateral surfaces of sternite almost vertical ( Fig. 92E ). Subgenital plate vertically descending to level of ventral margin of base of ovipositor; in lateral view with subparallel lateral margins, then strongly curved backward and with obtuse tip; in ventral view on both sides with subparallel ascending areas, in middle with two about oval backward projections separated by a deep furrow ( Figs. 92 D–E). Ventral valves of ovipositor at very base with a conical ventral projection. Ovipositor falcate, in subbasal area strongly, afterwards regularly upcurved and with gradually converging margins; tip narrowing, subacute ( Fig. 92F ).

Measurements (1 female).—body w/wings: 21; body w/o wings: 20; pronotum: 4.7; tegmen: 14; tegmen width: 5.6; hind femur: 8; ovipositor: 8.5 mm.

Figures

FIGURE 92. Genus Zalarnaca: A–G, Z. (Glolarnaca) elegantula sp. nov. holotype female; H–K, Z. (Zalarnaca) separata (Karny, 1926) holotype male.—Habitus dorsal view (A, I), lateral view (B, H), face (C, J), female end of abdomen with seventh sternite, subgenital plate and base of ovipositor in lateral (D) and in ventral view (E), ovipositor (F), stridulatory pegs on second and third abdominal tergites, front is left (G), male end of abdomen in apical view (K). Scales 10 mm.