Eugryllacris guomashan, 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 : 33

Eugryllacris guomashan sp. nov.

Figs. 4F , 5J , 8 G–H, 9M

Material examined. Holotype (female): China: Yunnan, South Yunnan (Xishuangbanna), 37 km NW Jinghong, Guo Ma Shan (NNNR), elev. 1080 m (22°17.91'N, 100°38.85'E), 26.v.2008, leg. A. Weigel (Erfurt NKME).

Other specimens: China: Yunnan, South Yunnan (Xishuangbanna), 23 km NW Jinghong, vic. Na Ban (NNNR), elev. 730 m (22°10'4''N, 100°39'52''E), 8.v.2009, leg. L. Meng EKL— 1 male nymph last instar (Erfurt NKME).

Diagnosis. While in all Eugryllacris species described so far from China (Bian & Shi 2016) and also the species described in the present paper from Vietnam the female seventh abdominal sternite terminates into a distinct process from middle of posterior margin, in the new species that process is reduced to a small tubercular structure only faintly projecting from the hind margin and the subgenital plate is curved in basal area and afterwards flat and triangular with rounded tip, not furrowed or grooved as in the other species ( Fig. 8H ). A similar situation is so far only described for one of the four females of what Karny (1930a) identified as G. ruficeps Serville, 1831 from Java. But that female has the medial projection somewhat wider and more distinct than in the new species described here.

Description. Large species ( Fig. 4F ). Head: Face large, oval; face in middle with fine transverse riffles, towards genae nearly smooth; fastigium verticis more than twice as wide as scapus; ocelli indistinct; fastigium frontis separated from fastigium verticis by a very fine suture; a pair of weak sub-antennal furrows, starting at internal angle of antennal scrobae, separates central area of face from lateral areas and fuses ventrally with clypeofrontal suture; clypeo-frontal suture interrupted in middle; subocular furrows distinct ( Fig. 5J ).

Wings surpassing mid of hind tibia and reaching about tip of ovipositor ( Fig. 4F ). Tegmen: Radius with two branches, both forked near tip; media anterior fused in basal area with radius; media posterior absent; cubitus anterior forks before mid-length into two veins, CuA1 and CuA2; cubitus posterior undivided, free throughout; with 5 anal veins.

Legs: Fore coxa with a rather large spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with 4 pairs of comparatively short ventral spines and 1 pair of smaller ventral spurs; hind femur with 8 external and 5 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine each; with 3 apical spurs on both sides.

Coloration. General color light brown (originally conserved in alcohol); vertex unicolored; disc of pronotum unicolored, hind margin little darker. Legs of general color. Face medium brown with indistinctly outlined lighter and darker areas, ventral area of clypeus and labrum yellowish brown; tips of mandibles and a small spot around baso-internal angle of mandibles black; compound eyes dark reddish brown. Tegmen semi-transparent white in distal, yellowish in proximal area, veins yellow to light brown; hind wing semi-transparent white, veins light brown, cells between cross-veins brown.

Male unknown.

Female. Seventh abdominal sternite of normal size but apical margin with a short obtuse projection covering very base of subgenital plate. Subgenital plate triangular in general outline but with broad obtuse tip that has a very faint constriction in middle ( Figs. 8 G–H). Base of ovipositor normal. Ovipositor upcurved, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 9M ).

Measurements (1 female).—body w/wings: 52; body w/o wings: 40; pronotum: 9,5; tegmen: 41; tegmen width: 16; hind femur: 20; antenna: 120; ovipositor: 17 mm.

Etymology. Named after the type locality; noun in apposition.

Figures

FIGURE 4. Genus Eugryllacris: Habitus dorsal view: A–B, E. trabicauda sp. nov. female holotype (A) and male paratype (B); C–D, E. vermicauda sp. nov. female holotype (C) male paratype (D); E, E. serricauda sp. nov. male holotype; F, E. guomashan sp. nov. female holotype; G, E. crassicauda sp. nov. female paratype; H, E. crassicauda cambodiana ssp. nov. female holotype; I, E. malaccensis (Griffini, 1908) male; J, E. serricauda sp. nov. female paratype. Scales 10 mm.

FIGURE 5. Genus Eugryllacris: A, E. gandaki sp. nov. female holotype; B, E. serricauda sp. nov. male holotype; C, E. crassicauda sp. nov. female paratype; D, E. crassicauda cambodiana sp. nov. female holotype; E, E. sulcata sp. nov. female holotype; F, E. malaccensis (Griffini, 1908) male; G, E. vermicauda sp. nov. female holotype; H, E. trabicauda sp. nov. female holotype; I, E. inversa sp. nov. male holotype; J, E. guomashan sp. nov. female holotype; K, E. sulcata sp. nov. female holotype.—Face (A–J), habitus dorsal view (K). Scales 5 mm (face); 10 mm (habitus).—Abbreviations: as antennal scrobus, cf clypeo-frontal suture, cl clypeus, e compound eye, ff fastigium frontis with median ocellus, fv fastigium verticis, la labrum, lo lateral ocellus, lp labial palpus, ma mandible, mo median ocellus, mp maxillary palpus, sa sub-antennal furrow, so subocular furrow, sc scapus. The arrow in H points at the spine at anterior coxa.

FIGURE 8. Genus Eugryllacris: A–B, E. trabicauda sp. nov. holotype; C–D, E. vermicauda sp. nov. holotype; E–F, E. sulcata sp. nov. holotype; G–H, E. guomashan sp. nov. holotype.—Apical area of female abdomen with seventh abdominal sternite, subgenital plate and base of ovipositor in lateral (A, C, E, G) and ventral view (B, D, F, H).

FIGURE 9. Genus Eugryllacris: A, E. inversa sp. nov. male holotype; B, E. maculipennis (Stål, 1877) det. Brunner female; C, E. maculipennis specularis (Karny, 1925) female type; D, E. gandaki sp. nov. female holotype; E, E. malaccensis (Griffini, 1908) male; F, E. crassicauda cambodiana ssp. nov. holotype; G, E. vermicauda sp. nov. holotype; H, E. inversa sp. nov. paratype; I, E. gandaki sp. nov.; J, E. sulcata sp. nov. holotype; K, E. crassicauda sp. nov. paratype; L, E. serricauda sp. nov. paratype; M, E. guomashan sp. nov. holotype; N, E. poultoniana (Griffini, 1909); O, E. trabicauda sp. nov. holotype.— Habitus in dorsal view (A–E) and lateral view (F), ovipositor (G–O). Scales 10 mm; images of ovipositor adapted to scale at bottom.