Diaphanogryllacris sinuata, 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 : 173-174

Diaphanogryllacris sinuata sp. nov.

F igs. 53G, 55C, 56G–I, 58C–E, 59C–D

Material examined. Holotype (male): Vietnam: Quang Tri prov., Da Krong Nat. R., (16°37'N, 106°47'E), 5– 10.vii.2011, leg. J. Constant & J. Bresseel (I.G. 31.933)—(Brussels RBINS).

Other specimens studied: Vietnam: same data as holotype— 1 female, 7 males (paratypes) (Brussels RBINS).

Diagnosis. The new species is close to D. annamita ( Griffini, 1908a) . It differs by the processes of the ninth abdominal tergite male being narrower at base with a smaller external groove and more gradually curved into the very narrow apical part while longer and wider with larger groove and more suddenly bent into the narrow apical part in D. annamita ; the hooks of the tenth tergite are very stout and short but gradually narrowed into the acute apical cone in D. sinuata sp. nov. while wider and obviously soft and suddenly constricted into the acute apical cone in D. annamita . The male phallus sclerite is in lateral view strongly sinuate while only little sinuate in D. annamita . The female subgenital plate is membranous and rather short in D. sinuata and the seventh sternite provided with a large rounded apical lobe while in D. annamita the subgenital plate is conical in apical half and the seventh sternite provided only with a small tuberculate lobe at apical margin. D. sinuata is also similar to D. orlovi Gorochov & Dawwrueng, 2015 . The female differs by the reduced, transverse, completely membranous subgenital plate while in D. orlovi it is triangular with rounded tip. The modification of the preceding seventh sternite provided with a triangularly rounded membranous apical lobe is similar to the situation in D. orlovi but wider, while the long membranous zone beneath and below that lobe is much shorter and the preceding sixth sternite is of normal size, not prolonged as in the latter. The male abdominal appendages with the thin and down-curved lateral processes of the ninth abdominal tergite are thinner at base and less strongly curved ventrad in D. sinuata , and the medial processes of the tenth abdominal tergite are gradually narrowed to the acute tip while in D. orlovi more strongly restricted in pre-apical area. Furthermore the apical lobes of the male subgenital plate are shorter than in D. orlovi .

Description. Medium sized species. Head: Face oval; nearly smooth; fastigium verticis wider than scapus; ocelli present; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows shallow ( Fig. 55C ). Abdominal tergites two and three each with two rows of clearly visible stridulatory pegs (6–8, 10–19; 6–14, 16–20; n = 2 males, 1 female).

Wings reaching or little surpassing about middle of stretched hind tibia ( Fig. 53G ). Tegmen: Radius divided into 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 a connection branch from MA, 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 5–7 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. Head brownish testaceous; vertex with an entire or interrupted black post-ocular band and with a pair of black spots between compound eyes; genae with a black spot below eyes and another black spot above at ventral end of subocular furrow, the latter sometimes missing; maxillary palpi light brown. Pronotum for the greatest part black with the following yellowish brown ornaments: a band along hind margin on disc and paranota, large spots at ventro-anterior angles, a small spot in middle of anterior margin, and two pairs of minute spots within the black coloration of disc, the posterior sometimes missing, the anterior spots can be sub-fused. Legs of general color. 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 step-like emargination with narrow membranous surface, at each side of this emargination a long and thin process curved ventrad. Tenth abdominal tergite with a pair of short and stout upright processes in middle with apical area compressed and tip acute, pointing towards body ( Figs. 56 G–H). Subgenital plate with little diverging lateral margins, apical margin on both sides oblique with rather short bicornute median process; slightly curved styli little shorter than length of subgenital plate, inserted at oblique areas of apical margin ( Fig. 56I ). Phallus with a narrow elongate but in lateral view strongly sinuate sclerite with forked and recurved base, in situ hidden in an infumate membranous sacculus ( Figs. 58 C–E).

Female. Seventh abdominal sternite nearly membranous with numerous narrow transverse riffles; apical half semi-oval, membranous; with black spots probably caused by wound closures; at hind margin with a wide projecting triangular lobe with rounded apex. Subgenital plate short, membranous, with a very small sclerite in middle of apical margin ( Fig. 59C ). Ovipositor elongate substraight, very faintly curved; tip with narrowed margins, subobtuse ( Fig. 59D ).

Measurements (8 males, 1 female).—body w/wings: male 42–50, female 48; body w/o wings: male 25–42, female 37; pronotum: male 6.0–6.5, female 6.8; tegmen: male 35.5–40.0, female 38; tegmen width: male 12–13, female 13.5; hind femur: male 16.5–19.0, female 19; antenna: male 120; ovipositor: female 35 mm.

Remark. One of the males was parasitized by a horsehair worm (Nematomorpha).

Etymology. Named for the strongly sinuate phallus sclerite.

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.