Eugryllacris sulcata, 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 : 40

Eugryllacris sulcata sp. nov.

Figs. 5E, 5K , 8 E–F, 9J

Material examined. East Malaysia: Sabah, Mt. Kinabalu, Poring, elev. 500–700 m (6°5'N, 116°33'E), 1– 31.vii.1992, leg. K. Riede— 1 female (holotype) (Bonn ZFMK).

Diagnosis. E. sulcata can be recognized by the deeply furrowed face ( Fig. 5E ), but especially characteristic are the shapes of the female seventh abdominal sternite and the subgenital plate ( Figs. 8 E–F). The seventh sternite is rounded disc-shaped except for the truncate basal margin, flat and without apical projection; also the subgenital plate is flat with a rather long membranous base, afterwards triangular but with truncate apical margin. This situation resembles somewhat the condition in Philippine Eugryllacris species as E. inversa sp. nov. and E. maculipennis laticauda ( Karny, 1925a) . Both species also have a triangular subgenital plate with truncate tip and the seventh sternite without a medial projection with apex simply rounded in E. sulcata instead of slightly bilobate in E. inversa .

Description. Large species ( Fig. 5K ). Head: Face wide ovoid; fastigium verticis about twice as wide as scapus; ocelli visible, especially median ocellus, but not very striking; fastigium frontis separated from fastigium verticis by a very fine suture; a pair of very strong sub-antennal furrows, starting at internal angle of antennal scrobae, separates central area of face from lateral areas and fuse ventrally with clypeo-frontal suture; clypeo-frontal suture interrupted in middle; subocular furrows also very distinct; clypeus with a fine transverse furrow below about basal third ( Fig. 5E ). Abdominal tergites two and three with few minute stridulatory pegs.

Wings reaching or little surpassing middle of stretched hind tibiae ( Fig. 5K ). 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 spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large, on mid tibiae comparatively short, ventral spines and one pair of smaller ventral spurs; hind femur with 8– 10 external and 5 internal spines on ventral margins.

Coloration. General color green when alive; vertex unicolored; disc of pronotum unicolored, hind margin hardly darker. Legs of general color. Face almost unicolored, probably green when alive; clypeo-frontal furrows black connected by a dark brown line. Tegmen semi-transparent with green veins; area behind radius faintly infumate in basal half to two thirds; hind wing semi-transparent with green or brown veins and veinlets; cells with large dark brown spots.

Male unknown.

Female. Seventh abdominal sternite with apical margin as whole prolonged to cover base of subgenital plate; roughly appearing as a round disc with truncate base ( Figs. 8 E–F). Subgenital plate in about about basal third membranous except for sclerotised margins; with strongly approaching lateral margins; apex subtruncate, faintly concave ( Fig. 8F ). Base of ovipositor with a small sclerite before base of ventral valves. Ovipositor of medium length, distinctly but not strongly curved dorsad, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 9J ).

Measurements (1 female).—body w/wings: 53; body w/o wings: 40; pronotum: 8.5; tegmen: 40; tegmen width: 19; hind femur: 19; antenna: 125; ovipositor: 17 mm.

Etymology. The new species is named for the deeply furrowed face; from Latin sulcus (furrow).

Figures

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.