Eugryllacris trabicauda, 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 : 37-38

publication ID 10.11646/zootaxa.4510.1.1

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Eugryllacris trabicauda

sp. nov.

Eugryllacris trabicauda View in CoL sp. nov.

Figs. 1B View FIGURE 1 , 4 View FIGURE 4 A–B, 5H, 6A–B, 8A–B, 9O

Material examined. Holotype (female): Vietnam: Hoa Binh Prov., Cuc Phuong National Park , (20°19'N, 105°36'30''E), 19–23.vii.2011, leg. J. Constant & J. Bresseel (I.G. 31.933)— 1 female (Brussels RBINS). GoogleMaps

Other specimens: same data as holotype, 1 male (paratype) (Brussels RBINS); same locality, 11–18.viii.2010, leg. J. Constant & P. Limbourg (I.G. 31.668)— 1 female (paratype) (Brussels RBINS) .

Diagnosis. With regard to the median process of the female seventh abdominal sternite, the new species resembles E. cylindrigera (Karny, 1926) , E. elongata Bian & Shi, 2016 , E. longifissa Bian & Shi, 2016 , and E. xiei Bian & Shi, 2016 , all from China. It differs by the narrow but distinct apical excision of that process and more strikingly by the very long and straight ovipositor while the species compared have a much shorter and upcurved ovipositor. Such a long and straight ovipositor is so far only known within the genus from E. vaginalis ( Pictet & Saussure, 1891) from India and E. crassicauda sp. nov. from Thailand and Cambodia, E. trabicauda sp. nov. differs from both by the uncolored, subtransparent hind wings, an even longer ovipositor ( Fig. 9O View FIGURE 9 ), the subgenital plate being distinctly excised at tip and the shape of the seventh abdominal sternite ( Figs. 8 View FIGURE 8 A–B). The male abdominal apex of E. trabicauda sp. nov. is similar to that of E. vermicauda sp. nov. It differs by the pair of projections in the middle of the split apical margin of the ninth tergite below the obtuse bumps, which are shorter and conical ( Fig. 6B View FIGURE 6 ) instead of compressed, longer and little curved ( Fig. 6D View FIGURE 6 ).

Description. Large species ( Figs. 4 View FIGURE 4 A–B). Head: Face ovoid; fastigium verticis distinctly wider than scapus; ocelli distinct, of light color; fastigium frontis separated from fastigium verticis by a very fine suture; a pair of short, weak furrows, starting at internal angle of antennal scrobae, outline the fastigium frontis; subocular furrows weak and restricted to upper part ( Fig. 5H View FIGURE 5 ). Abdominal tergites two and three with few, very minute, indistinct stridulatory pegs.

Wings surpassing hind knees. Tegmen ( Fig. 1B View FIGURE 1 ): 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 4–5 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 4– 9 external and 3–9 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 [male left hind tibia regenerated: shorter, with almost no spines, right hind tibia normal].

Coloration. General color discolored brownish, might have been green when alive, legs with remnants of green; vertex unicolored; disc of pronotum unicolored, hind margin hardly darker. Legs of general color. Face unicolored brownish, maybe green when alive; eyes red brown; clypeo-frontal sutures darkened. Tegmen semitransparent with darker veins; except along anterior and apical margins with yellowish brown infumation (probably green when alive); hind wing semi-transparent white with brown veins and lighter cross-veins.

Male. Eighth abdominal tergite prolonged. Ninth abdominal tergite semi-globular: prolonged and down-curved laterally and apically; in descending posterior area furrowed in midline, at end of furrow split and on both sides of split area with an obtuse bump and below bump with a small conical projection pointing mediad ( Figs. 6 View FIGURE 6 A–B). Epiproct and paraproctes distinct. Subgenital plate almost twice as wide as long; lateral margins convex; apical margin wide, slightly obtuse-triangularly excised; curved styli inserted laterally just before apical margin ( Fig. 6A View FIGURE 6 ).

Female. Seventh abdominal sternite with roundly converging lateral margins and a long, narrow, parallel-sided apical projection with obtuse, in middle slightly concave tip covering base of subgenital plate ( Figs. 8 View FIGURE 8 A–B). Subgenital plate with nearly straight converging lateral margins, apical margin in middle concave, on both sides obtuse angular; surface in more than basal third grooved and in middle towards base membranous ( Fig. 8B View FIGURE 8 ). Base of ovipositor with a small sclerotised bump between subgenital plate and very base of ovipositor. Ovipositor elongate, only faintly curved dorsad, margins slightly and gradually narrowing towards tip; dorsal margin with a slight expansion before tip ( Fig. 9O View FIGURE 9 ).

Measurements (1 male, 2 females).—body w/wings: male 54, female 49–54; body w/o wings: male 37, female 36–41; pronotum: male 8.5, female 9.0–9.5; tegmen: male 39, female 36–37; tegmen width: male 14, female 13; hind femur: male 22.5, female 21.5–23.0; antenna: female 115–190; ovipositor: female 38–40 mm.

Etymology. The new species is named for the shape of the female seventh abdominal sternite; from Latin trabs (beam) and cauda (tail).


Royal Belgian Institute of Natural Sciences

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