Eugryllacris vermicauda, 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 : 38-39

publication ID 10.11646/zootaxa.4510.1.1

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Eugryllacris vermicauda

sp. nov.

Eugryllacris vermicauda View in CoL sp. nov.

Figs. 4 View FIGURE 4 C–D, 5G, 6C–D, 8C–D, 9G

Material examined. Holotype (female): Vietnam: Prov. Vinhfu, Tam Dao N.P., (21°31'N, 105°33'E), 25– 30.vii.2011, leg. J. Constant & J. Bresseel (I.G. 31.933) (Brussels RBINS). GoogleMaps

Other specimens: same data as holotype, 1 female, 1 male (paratypes) (Brussels RBINS).

Diagnosis. With regard to habitus, size, and coloration the new species is very similar to E. trabicauda sp. nov. It differs by the shape of the female seventh abdominal sternite that is triangular with a deep medial furrow and terminates into a long membranous projection ( Figs. 8 View FIGURE 8 C–D). The shape of that sternite and its projection are so far unique within the genus. It also differs by the much shorter and curved ovipositor. Males of E. vermicauda sp. nov. differ from those of E. trabicauda by the pair of projections in the middle of the split apical margin of the ninth tergite below the obtuse bumps, which are compressed, longer and little curved ( Fig. 6D View FIGURE 6 ) instead of shorter and conical ( Fig. 6B View FIGURE 6 ).

Description. Large species ( Figs. 4 View FIGURE 4 C–D). Head: Face wide ovoid; fastigium verticis distinctly wider than scapus; ocelli distinct; 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 fastigium frontis; subocular furrows fine and of irregular course, weak and restricted to upper part ( Fig. 5G View FIGURE 5 ). Abdominal tergites two and three with very minute, indistinct stridulatory pegs.

Wings surpassing hind knees ( Figs. 4 View FIGURE 4 C–D). 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 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 7– 10 external and 3–5 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 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 with remnants of green. Face unicolored brownish, maybe green when alive. Tegmen semi-transparent with veins hardly darker in basal half (C, Sc + R green), becoming dark brown towards apex; except along anterior and apical margins with yellowish brown infumation (probably green when alive); hind wing semi-transparent white with black main veins and light green or brown 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 both bumps with a long compressed projection pointing mediad; projections of both sides overlapping ( Figs. 6 View FIGURE 6 C–D). Epiproct and paraproctes distinct. Subgenital plate about twice as wide as long; lateral margins straight, little converging; apical margin wide, roughly bi-triangular with lobes and medial excision obtuse; slightly curved styli inserted laterally at the apical angles ( Fig. 6C View FIGURE 6 ).

Female. Seventh abdominal sternite elongate triangular with convex lateral margins and a deep medial furrow; at tip prolonged into a long, upcurved, membranous process covering part of subgenital plate ( Figs. 8 View FIGURE 8 C–D). Subgenital plate with converging, slightly concave lateral margins; apical margin in middle concave, on both sides obtuse angular; in basal half with a rather small membranous groove, in apical half slightly furrowed in midline ( Fig. 8D View FIGURE 8 ). Base of ovipositor with a small sclerotised bump between subgenital plate and very base of ovipositor. 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. 9G View FIGURE 9 ).

Measurements (1 male, 2 females).—body w/wings: male 44, female 48–50; body w/o wings: male 31, female 38–40; pronotum: male 8.5, female 8.5; tegmen: male 33, female 34–35; tegmen width: female 12.5; hind femur: male 20.5, female 20–21; antenna: female 150; ovipositor: female 23 mm.

Etymology. The new species is named for the characteristic projection of the female seventh abdominal sternite; from Latin vermis (worm) and cauda (tail).


Royal Belgian Institute of Natural Sciences

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