Diaphanogryllacris opulenta, 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 : 168-169

Diaphanogryllacris opulenta sp. nov.

Figs. 53I , 55B, 55K , 56 D–F, 58K–N

Material examined. Holotype male: Thailand: Tak, Ban Mae Salit, Monkrating resort, elev. 700–800 m (17°30'N, 98°5'E), 15–21.v.1988, leg. S. Ingrisch—(Bonn ZFMK).

Diagnosis. The new species differs from all other species of the genus so far described by the short but very wide step-like declined apical margin of the ninth abdominal tergite in male, from which in middle, not at lateral angles of apical excision, a pair of short, slightly sinuate, acute spines is projecting posteriorly and not curved down as in other species. This condition resembles somewhat the condition in D. aequalis ( Walker, 1869) or D. translucens ( Serville, 1838) , but those species have very short, simple apical spines on ninth tergite while in D. opulenta sp. nov. they are long and complex. The projections of the tenth abdominal tergite are elongate beamshaped with upcurved subacute tip, inserted between the spines of the ninth tergite and little longer than these. The base of the phallus sclerite that is not simply divided and recurved as in other species but compressed, widened and anchored at the phallus by a semi-sclerotised structure of the phallus membrane, which is so far unknown from any other species of the genus.

Description. Rather large for the genus. Head: Face oval; nearly smooth; fastigium verticis wider than scapus; ocelli distinct; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows shallow ( Fig. 55B ). Abdomen with distinct stridulatory pegs on second and third tergites, only first row of second tergite very faint (3, 14; 13, 19; n = 1 male; Fig. 55K ).

Wings reaching or little surpassing middle of stretched hind tibia ( Fig. 53I ). Tegmen: Radius with two branches, both forked near tip; media anterior free, in subbasal area closely approached to radius; 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.

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 light brown; vertex brown with black spot behind compound eyes and on fastigium verticis; pronotum brown with large black spot in middle interrupted by four small brown spots; legs of general color. Face yellowish brown with black spots below compound eyes and at baso-lateral angles of clypeus. Tegmen semi-transparent white, veins and veinlets brown; towards base little darker; hind wing semi-transparent white, veins and veinlets brown.

Male. Eighth abdominal tergite only little prolonged. Ninth abdominal tergite globular, at apical margin with a wide step-like emargination, from lateral angles of this emargination a pair of long, narrow, faintly sinuate spines projecting backward. Tenth abdominal tergite in apical view band-shaped, furrowed in middle, on both sides of furrow, and between spines of ninth tergite, with an upcurved, hook-shaped, acute spine; in ventral view this structure continues as furrowed plate towards inside body ( Figs. 56 D–E). Subgenital plate widening from base to apical margin; apical margin on both sides with bases of long and stout styli, in middle with a rather wide projection dividing into two cones ( Fig. 56F ). Phallus sclerite elongate, slightly sinuate with subacute tip; at base strongly widened toward both sides but flattened and with irregular margin; dark, stiffened, bulging and striated structures of the phallus membrane forming an embracing structure around that base ( Figs. 58 K–N).

Measurements (1 male).—body w/wings: 53; body w/o wings: 38; pronotum: 6.8; tegmen: 43; tegmen width: 15.5; hind femur: 20.5; antenna: 130 mm.

Etymology. The new species is named for its large, extended phallus sclerite; from Latin opulentus, opulenta (considerably large, luxuriant).

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).