Diaphanogryllacris annamita tenera, 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 : 158-166

Diaphanogryllacris annamita tenera ssp. nov .

Figs. 53 A–B, 55A, 56A–C, 58A–B, 59A–B

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).

Other specimens studied. 1 female, 1 male (paratypes) (Brussels RBINS).

Diagnosis. The new species is similar to D. a. annamita (Griffini, 1909) and D. orlovi Gorochov & Dawwrueng, 2015 ). It differs from D. a. annamita by the projections of the male tenth abdominal tergite being less bulgy at base and provided with distinctly longer apical spines curved markedly proximad while the projections of the ninth abdominal tergite are nearly identical. The bicornute apical lobe of the male subgenital plate is shorter than in the nominate subspecies. The female differs from that of the nominate subspecies by the faintly sclerotised part of the seventh abdominal sternite covering less than half of the sternum, not three quarters; the subgenital plate is sclerotised only along the apical margin, which is truncate at both sides and interrupted in middle by an obtuse membranous flap, while it is triangular with lateral incision in D. a. annamita . From D. orlovi males differ by the central spines of the tenth abdominal tergite being bulgy on the proximal side not on the distal side, and the lateral spines of the ninth abdominal tergite are narrower at base and substraight, not curved, in distal two thirds; moreover, the bicornute apical lobe of the male subgenital plate is shorter than in D. orlovi . The short female seventh abdominal sternite and the subgenital plate are of quite different shapes from those of D. orlovi .

Description. Medium sized species. Head: Face oval; nearly smooth; fastigium verticis wider than scapus; ocelli little distinct; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows shallow ( Fig. 55A ). Abdominal tergites two and three each with two rows of stridulatory pegs (8, 12–20; 16, 16; n = 1 male, 1 female).

Wings reaching about middle of stretched hind tibia ( Fig. 53 A–B). Tegmen: Radius with two branches, both forked near tip; media anterior free at very base, in subbasal area narrowly approached to but not fused with radius; in female cubitus anterior at base with a single branch that forks into two veins, the anterior branch makes a curvature and shortly after divides again into two parallel branches, MP and CuA1, while the posterior branch (CuA2) does not divide further; in male holotype both, media anterior and cubitus anterior, send a distinct short oblique connection branch to the field between both veins where they fuse to form MP+CuA1, after about 2–3 mm that vein divides into MP and CuA1 (more distinct on right than on little distorted left tegmen, Fig53A ); cubitus posterior undivided, free throughout; with 4 anal veins, last two with common stem.

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 6–7 external and 6–7 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides.

Coloration. General color brown; head brownish testaceous; vertex to a variable extend black, on fastigium verticis alternating with 3 light bands, pronotum with a large black spot, anterior rim, anterior angles, hind margin and 2 small spots in middle of disc light brown; legs uniformly brown. Face yellowish brown with black spots below compound eyes, at baso-lateral angles of clypeus and a small round spot in lateral area of face; tip of mandibles also black. Tegmen semi-transparent white, veins and veinlets brown, towards base yellow, veinlets black; hind wing semi-transparent white, veins and veinlets brown.

Male. Eighth abdominal tergite only little prolonged. Ninth abdominal tergite globular with apical margin roundly excised in middle; on both sides of excision with a long narrow down-curved hook. Tenth abdominal tergite with a pair of upcurved hooks touching each other in middle; in apical view hooks elongate, conical, with dark brown acute apical area; in lateral view compressed, nearly rectangularly upcurved with distal margin running straight into darkened apical area, while proximal margin curved ( Figs. 56 A–B). Subgenital plate almost as long as wide; apical margin with two triangular lobes (little shorter than in D. orlovi ), concave at both sides; styli stout, slightly upcurved and in apical area conical ( Fig. 56C ). Phallus with a narrow elongate but little sinuate sclerite with forked and recurved base, in situ embedded into a little darkened membranous sac ( Figs. 58 A–B).

Female. Seventh abdominal sternite little more than twice as wide as long; apical margin roundly excised and provided with a distinct pit. Subgenital plate largely membranous with transverse riffles and two oval pits near base; apical area sclerotised; apical margin truncate at both sides with a little projecting central lobe with straight lateral margins and convex apical margin ( Fig. 59A ). Ovipositor elongate substraight with faintly approaching margins; tip with narrowed margins, subobtuse ( Fig. 59B ).

Measurements (2 males, 1 female).—body w/wings: male 48–50, female 47; body w/o wings: male 35–37, female 37; pronotum: male 6.0–6.5, female 6.8; tegmen: male 34–37, female 37; tegmen width: male 11, female 13.5; hind femur: male 18.0–18.5, female 18.5; antenna: male 100–105, female 130; ovipositor: female 35 mm.

Etymology. The name refers to the completely soft, not stiffened subgenital plate of the female; from Latin tenera (soft).

Figures

FIGURE 53. Genus Diaphanogryllacris, habitus dorsal view: A–B, D. annamita tenera ssp. nov. male holotype (A) and female paratype (B); C, D. aequalis (Walker, 1859) [lectotype of G. annulata Brunner, 1888 BrW16.117] male; D, D. recta? female from Cham Chu; E, D. brevispina Du et al., 2016 female; F, D. laeta (Walker, 1869) [holotype of G. chinensis Brunner, 1888 BrW14.463] male; G, D. sinuata sp. nov. male holotype; H, D. recta sp. nov. male holotype; I, D. opulenta sp. nov. male holotype. Scales 10 mm.

FIGURE 55. Genus Diaphanogryllacris: A, D. annamita tenera ssp. nov.; B, D. opulenta sp. nov.; C, D. sinuata sp. nov.; D, D. annamita (Griffini, 1909); E, D. normalis Gorochov & Wozn., 1999; F, D. recta sp. nov.; G–H, D. panitvongi Gorochov et al., 2015 from Con Son Island (G) and from Nam Nao (H); I, D. recta? from Cham Chu; J, D. normalis Gorochov & Wozn., 1999 mirror image; K, D. opulenta sp. nov.—Face (A–I), stridulatory pegs on second and third abdominal tergites, front is left (J–K).

FIGURE 56. Genus Diaphanogryllacris: Male abdominal apex of A–C, D. annamita tenera ssp. nov.; D–F, D. opulenta sp. nov.; G–I, D. sinuata sp. nov. (G holotype, H–I paratype); J–L, D. recta sp. nov.—Abdominal apex in apical (A, D, G, J), lateral (B, E, H, K), and ventral view (C, F, I, L).

FIGURE 58. Genus Diaphanogryllacris: Male phallus sclerites with surrounding membranes, partly freed: A–B, D. annamita tenera ssp. nov.; C–E, D. sinuata sp. nov. paratype (C) and holotype (D–E); F–G, D. recta sp. nov.; H–I, D. annamita (Griffini, 1909); J, D. panitvongi Gorochov et al., 2015 from Siem Reap; K–N, D. opulenta sp. nov., in top view (A, C–D, F, H, J), lateral view (B, E, G, I, N), oblique lateral view (M), oblique proximal view (K–L).

FIGURE 59. Genus Diaphanogryllacris: A–B, D. annamita tenera ssp. nov.; C–D, D. sinuata sp. nov.; E, D. sp. specimen from Ban Om Khut; F–G, D. brevispina Du et al., 2016; H–I, D. normalis Gorochov & Wozn., 1999; J–K, D. recta sp. nov.; L, D. panitvongi Gorochov et al., 2015 from Na Haeo; M–N, D. recta? from Cham Chu; O, D. panitvongi Gorochov et al., 2015 from Con Son Island.—Ventral view of female abdominal apex with seventh sternite and subgenital plate (A, C, E, F, H, J, L, M, O), female habitus in lateral view (D, K) and ovipositor (B, G, I, N). Scales 10 mm.