Eugryllacris inversa, 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 : 41-42

publication ID 10.11646/zootaxa.4510.1.1

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Eugryllacris inversa

sp. nov.

Eugryllacris inversa View in CoL sp. nov.

Figs. 5I View FIGURE 5 , 6 View FIGURE 6 L–M, 7H, 9A, 9H

Material examined. Holotype (male): Philippines: Luzon , Baguio (ex Huenaerts), 1–31.v.1969, ex coll. Debatisse, Don N. Mal— 1 male (Brussels RBINS).

Other specimens: same locality, 1–, (I.G.: 26.987)— 1 female (paratype) (Brussels RBINS);

Diagnosis. The new species differs from E. maculipennis ( Stål, 1877) and ist subspecies by the shape of the less reduced tegmen that is wide throughout with only the tip narrowed instead of with conical apical half and by the much wider expansion of the black marks and patterns on tegmen and hind wing instead of having yellowish tegmina with a black macula, as well as by the nearly completely black head and pronotum that are light brown in the subspecies of E. maculipennis ( Fig. 5I View FIGURE 5 ). The male abdominal apex ( Figs. 6 View FIGURE 6 L–M) is similar to that of Eugryllacris maculipennis specularis (Karny, 1925) as figured in Karny (1925a) ( Fig. 9C View FIGURE 9 ), but E. inversa sp. nov. has much darker coloration of head, pronotum and tegmen, larger size, and longer wings. Another Philippine species E. moesta ( Brunner, 1888) also has similar projections from ninth abdominal tergite, but angularly curved and different in details.

Discussion. The new species is similar to E. maculipennis ( Stål, 1877) in having a shining black speculum along the anterior margin of the tegmen that is however distinctly longer than in E. maculipennis ( Fig. 9B View FIGURE 9 ). It differs from the nominate subspecies E. m. maculipennis (photo of holotype in Sjöstedt 1933) and the other three subspecies, E. m. bakeri ( Griffini, 1915b), E. m. laticauda ( Karny, 1925a), and E. m. specularis ( Karny, 1925a; Fig. 9C View FIGURE 9 ), by longer fore and hind wings with much more extended dark color pattern thus that even the tegmen has blackish brown flecks in the cells between the veinlets, and the hind wing is fully blackish brown with narrow light bands along the cross veins. Moreover head and pronotum of E. inversa are fully shining black ( Fig. 5I View FIGURE 5 ) while they are light yellowish brown in E. maculipennis and its subspecies. The apical area of the female subgenital plate is similar to that of E. m. laticauda, but has a large triangular excision from base with obtuse rounded posterior angle ( Fig. 7H View FIGURE 7 ). The apical area of the seventh sternite terminates into two rather closely approached short rounded lobes while the angular apical lobes in E. m. laticauda are more distant; moreover in the new species there are two transversely oblique shallow depressions in front of the apical lobes with well outlined posterior rim.

Description. Medium sized species. Head: Face narrow ovoid, nearly smooth, shining with scattered impressed dots and very fine transverse riffles; fastigium verticis wider than scapus; ocelli indistinct; fastigium frontis indistinctly separated from fastigium verticis; subocular furrows distinct; without sub-antennal furrows ( Fig. 5I View FIGURE 5 ).

Wings surpassing hind knees; hind wings distinctly longer than tegmina ( Fig. 9A View FIGURE 9 ). Tegmen: Radius gives rise to RS in about mid-length of tegmen; both forked again; media anterior fused in about basal quarter with radius, then runs close to it until about mid-length, afterwards free. Cubitus anterior forks somewhat before mid-length into CuA1 and CuA2 without further divisions; cubitus posterior undivided, free throughout; with 4 anal veins, the last two with common base.

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 spines on both ventral margins.

Coloration. Head, greatest part of pronotum and lateral area of tegmen largely black; otherwise various shades of brown. Face black including basal area of antennae black; only ventral area of labrum, lateral bands on clypeus, and palpi brown (male), in female only clypeus and palpi brown. Tegmen anterior area (before ScP) black with a bluish shine in more than basal half, otherwise blackish brown, interrupted by brown veins and the light bands on both sides of the cross-veins; in male only in about basal third between CuP and An3 medium brown, in female this area is also black and with dark brown veins; hind wing blackish brown, interrupted by brown veins and the light bands on both sides of the cross-veins.

Male. Eighth abdominal tergite prolonged but of normal shape. Ninth abdominal tergite globular with medial furrow and bulbous swelling on both sides, at ventral margin becoming membranous and divided; on both sides of middle with a projecting process that is compressed and wide at base, then narrowed into a long, upcurved spine ( Fig. 6M View FIGURE 6 ). Subgenital plate wider than long with medial furrow, apical margin shortly bi-lobate, with styli inserted at apico-lateral angles ( Fig. 6L View FIGURE 6 ).

Female. Seventh abdominal sternite prolonged, in apical area shallowly furrowed and with bilobate margin. Subgenital plate in basal area rather wide with up-bent lateral margins, in middle of base with a roughly triangular excision with rounded angle forming a membranous groove; afterwards subgenital plate with slightly concave, approaching lateral margins, at tip faintly bilobate, before tip with a shallow furrow ( Fig. 7H View FIGURE 7 ). Ovipositor of medium length; behind base strongly upcurved, afterwards only slightly curved, with approaching margins and a lateral furrow ending before apical area; at end with a slight pre-apical widening, tip subacute ( Fig. 9H View FIGURE 9 ).

Measurements (1 male, 1 female).—body w/wings: male 41, female 31; body w/o wings: male 27, female 22; pronotum: male 6, female 5; tegmen: male 29, female 21; hind femur: male 17, female 14; tegmen width: male 11.5; ovipositor: female 12 mm.

Etymology. The name of the new species is given for the color pattern of the hind wings, blackish brown with narrow light bands, which is opposite to the common pattern light with dark bands.


Royal Belgian Institute of Natural Sciences

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