Diaphanogryllacris recta, 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 : 171-172

Diaphanogryllacris recta sp. nov.

Figs. 53D, 53H , 55F, 55I ,, 56 J–L, 58G, 59J–K, 59M–N

Material examined. Holotype (male): 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).

Other specimens studied: Vietnam: same data as holotype— 2 females, 4 males (paratypes) (Brussels RBINS); VinhPhuc prov. , MeLinh B.S., (21°23'38''N, 105°42'56''E), 30.vi.–1.vii.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)— 1 female, 1 male (Brussels RBINS) ; ChamChu N. R., (22°12'N, 105°6'0''E), 8–12.vii.2015, leg. J. Constant & J. Bresseel (I.G.: 33.092)— 1 female (Brussels RBINS) .

Remark. A single female from ChamChu was collected freshly moulted and has the subgenital plate distorted. It is included with doubt in this species.

Diagnosis. The male abdominal apex of the new species is similar to that of D. panfilovi Gorochov & Woznessenskij, 1999 and D. annamita (Griffini, 1909) . It differs from D. annamita by the projections of the ninth abdominal tergite being wider at base, about triangular not nearly parallel-sided, and the apical parts are distinctly compressed and in apical view slightly curved not straight; the projections of the tenth tergite are not stout at base as in D. annamita but of nearly equal width from base and only at tip laterally compressed. From the situation in D. panfilovi , D. recta differs by the projections of the ninth tergite being twisted from the transition between the broad basal to the narrow apical part and the apical part is curved in basal and apical area, not straight, the projections of the tenth tergite are longer and narrower. The female of D. recta has the seventh abdominal sternite fully membranous as in D. annamita , but the short membranous process lies in about the middle not at end of the membranous area. The female subgenital plates of both taxa are very similar. D. panfilovi is only known from the male.

Description. Medium sized species. Head: Face oval; nearly smooth or with very fine transverse riffles in middle; fastigium verticis wider than scapus; ocelli present; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows shallow ( Fig. 55F ). Abdominal tergites two and three each with two rows of stridulatory pegs (6–7, 9–12; 12, 16–17; n = 1 male, 1 female).

Wings little surpassing middle of stretched hind tibia ( Fig. 53H ). 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, receives a connection branch from MA (in female very distinct), shortly after it divides 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 6–8 external and 7–10 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 black, ventro-anterior angles, hind margin and some scattered small spots light brown; legs of general color with genicular area and part of tarsal segments black. Face yellowish brown with black spots on fastigium verticis and at baso-lateral angles of clypeus; tip of mandibles also black. Tegmen semi-transparent white, veins and veinlets brown; towards base darker; hind wing semi-transparent white, veins and veinlets brown.

Male. Eighth abdominal tergite only little prolonged. Ninth abdominal tergite rather short, little globular, apical margin emarginated on both sides, in middle with a narrow projection with truncate tip, emarginated area vertical with membranous surface, at lateral margins of emargination a vaulted plate-shaped process that terminates into a long, narrow, compressed, little curved and acute spine bent ventrad. Tenth abdominal tergite in middle and between projections of ninth tergite with a pair of narrow, upright, acute projections curved faintly proximad and terminating below of an elongate but truncate median process of ninth tergite ( Figs. 56 J–K). Subgenital plate with convex lateral margins, apical margin on both sides oblique with bicornute median process; slightly curved styli little shorter than length of subgenital plate, inserted at oblique areas of apical margin ( Fig. 56L ). Phallus with a narrow elongate but little sinuate sclerite ( Fig. 58G ).

Female. Seventh abdominal sternite fully membranous but at base little stiffened; in center with a large complex membranous elevation containing a transverse fissure at both sides, probably resulting from punctures of the male appendages. Subgenital plate fully membranous; apical area triangular with rounded tip (reversed upside down in preparation) ( Fig. 59J ). Base of ovipositor with long oval gonangulum at base. Ovipositor very long, substraight; only before tip faintly upcurved; tip with narrowed margins, subobtuse ( Fig. 59K ).

Measurements (6 males, 3 females).—body w/wings: male 42–48, female 42–45; body w/o wings: male 27– 34, female 33–40; pronotum: male 5.5–7.0, female 6.5–7.0; tegmen: male 31–37, female 33–35; tegmen width: male 11.0–11.5, female 11.5; hind femur: male 12–19, female 17–19; antenna: male 115–120, female 130; ovipositor: female 29–31 mm.

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.