Zalarnaca (Glolarnaca) globiceps minor, Ingrisch, 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 : 256-257

Zalarnaca (Glolarnaca) globiceps minor ssp. nov .

Figs. 93 H–N

Material examined. Holotype male: Vietnam: Dong Nai Biosphere Res., (11°18'N, 107°6'E), 25.vi.–6.vii.2012, leg. J. Constant & J. Bresseel (I.G.: 32.161)—(Brussels RBINS).

Diagnosis. The new subspecies is similar to Z. globiceps ( Karny, 1929b) from Cambodia. Like that species, it has the male eighth abdominal tergite prolonged and projecting and the ninth tergite flipped to the underside of the eight tergite thus that in situ it is hidden for a large part by the subgenital plate ( Fig. 93J ). In contrast to other species of the genus, in Z. globiceps and the new subspecies the ninth tergite is furrowed and membranous in midline. Z. g. minor ssp. nov . differs from Z. g. globiceps and Z. g. gialai Gorochov, 2008 (the latter only known from female) by smaller size, especially by distinctly shorter tegmen (15.5 against 22–26 mm), and the male subgenital plate is truncate at tip instead of triangularly excised.

Description. Small to medium sized species. Head: Face robust but not particularly large; in frontal view ovoid; forehead nearly smooth; fastigium verticis wider than scapus; ocelli little distinct ( Fig. 93I ); Abdominal tergites two and three with stridulatory pegs.

Fully winged; tegmen distinctly surpassing hind knees, hind wings markedly longer than tegmen ( Fig. 93H ). Tegmen: Radius releases RS before apical quarter of tegmen, R branches again near tip, RS remains single branched; media free from base but in basal half very close to or touching radius, unbranched but sending a short oblique connection vein to CuA1; cubitus anterior at base with a single branch that forks into two veins, the anterior branch makes a curvature and receives an oblique connection vein from MA and shortly after divides again into two parallel branches, MP and CuA1, while the posterior branch (CuA2) does not divide further; cubitus posterior undivided, free throughout; with 4 anal veins, last two with common stem, last anal vein incomplete.

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 small spines on both ventral margins, with 10–11 external and 8 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 light to medium brown, vertex and a median band of pronotum black, on pronotum widening posteriorly and interrupted in posterior half by 2 narrow longitudinal light bands; area before and behind genicular area of hind legs also black but not genicular area itself; hind femur with 2 dark brown longitudinal bands. Face whitish brown with 6 black spots, of which 4 at antennal scrobae, 2 at clypeo-frontal suture; mandibles medium brown with dark rims. Tegmen brown transparent, veins little darker; hind wing transparent, veins brownish, projecting area infumate.

Male. Eighth abdominal tergite prolonged. Ninth abdominal tergite collapsed in middle and somewhat deformed (collected freshly moulted); probably vaulted and more vertically oriented, rather elongate with converging margins and probably wide-shallowly grooved on both sides of midline; in apical third narrower, parallel-sided and gradually divided into two lobes with rounded and recurved apico-lateral angle terminating into a black hook curved dorso-proximad, tip subacute ( Figs. 93 K–M). Subgenital plate wider than long with convex lateral margins and slightly bilobate apical margin, about basal half of ventral surface bulging corresponding to a dorsal (=internal) groove; dorsal (=internal) side with a distinct rim especially along apico-lateral angles; styli inserted on top of that rim ( Fig. 93N ). Phallus hidden.

Female unknown.

Measurements (1 male).—body w/wings: 19; body w/o wings: 16; pronotum: 3.5; tegmen: 15.5; tegmen width: 4.5; hind femur: 7.5; antenna: 90 mm.

Figures

FIGURE 93. Genus Zalarnaca: A–G, Z. (Zalarnaca) maninjau sp. nov. holotype male; H–N, Z. (Glolarnaca) globiceps minor ssp. nov. holotype male.—Habitus dorsal view (A, H), face (B, I), abdominal apex in lateral view (C, J), apical view (K–L), ventro-apical view (D), and ventral view (N), projections of ninth and tenth abdominal tergite (E, M), stridulatory pegs on second and third abdominal tergites, front is left (F), apical area of left hind tibia (G). Scales 10 mm.