Ultragryllacris triangula, 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 : 246-247

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https://doi.org/ 10.11646/zootaxa.4510.1.1

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scientific name

Ultragryllacris triangula

sp. nov.

Ultragryllacris triangula View in CoL sp. nov.

Figs. 1E View FIGURE 1 , 88 View FIGURE 88 D–I, 89A–D, 101C

Material examined. Holotype (male): Thailand: Tak, Umphang , (16°2'N, 98°50'E), 15–18.x.1991, leg. S. Ingrisch—(Bonn ZFMK). GoogleMaps

Other specimens studied: same data as holotype 1 female, 1 male (paratypes) (Bonn ZFMK).

Diagnosis. The new species strikingly differs from U. pulchra Gorochov & Dawwrueng, 2015 and its subspecies by the triangular male ninth abdominal tergite. In U. triangula sp. nov. the ninth tergite is regularly narrowed from base to tip, in apical area slightly down-curved and at tip narrow and obtusely rounded instead of only little narrowed from base to apex and with wide convex tip ( Fig. 89A View FIGURE 89 ). The female subgenital plate of U. triangula is much shorter than in U. pulchra and of different shape ( Fig. 88H View FIGURE 88 ).

Description. Medium large species. Head: Face oval; forehead nearly smooth with very fine transverse riffles and sparse punctures; fastigium verticis wider than scapus; ocelli distinct, median ocellus very large; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows shallow, widening ventrad ( Fig. 88G View FIGURE 88 ). Abdominal tergites two and three without stridulatory pegs.

Wings little surpassing hind knees ( Figs. 88 View FIGURE 88 D–E). Tegmen: Radius with two branches, both forked near tip; media anterior free from base; cubitus anterior at base with a single branch that forks into two veins and just after forking fuses with a short connection vein from MA to MP+CuA1; only in one of the males this anterior branch then forks into 2 veins, MP and CuA1, in the other wings it does not divide further; the posterior branch (CuA2) does not divide further; cubitus posterior undivided, free throughout; with 4 anal veins, last two with common stem.

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 6–9 external and 11–14 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 yellow, ivory white when alive; pronotum with 2 separate or connected black spots at anterior margin and a transverse band at posterior margin, anterior and posterior rims also black ( Fig. 88F View FIGURE 88 ); legs of general color, genicular areas of all legs black; hind tibia with black spots at bases of dorsal spines; tarsi and tips of tibiae dark brown or black. Face light yellow; a transverse band or two spots at fastigium verticis, antennal scrobae, scapus, pedicellus, a band along subocular furrow, labrum, mandibles, and maxillary palpi black. Tegmen semi-transparent yellow with yellowish or brown veins; hind wing semi-transparent white with yellowish or brown veins.

Male. Eighth abdominal tergite prolonged and globular with apical surface little concave and apical margin slightly curved posteriorly; setose. Ninth abdominal tergite forming a large, spatial structure: in dorsal view elongate triangular with apex truncate; lateral and apical margins curved to ventral surface, which has a distinct medial furrow from base to tip; whole dorsal and ventral surfaces setose; the dorsal side of the structure comes out beneath tergite eight, on ventral side at very base there is a distinct membranous area on both sides, thus the structure is obviously moveable against eight tergite; its function is unknown ( Figs. 89 View FIGURE 89 A–D). Tenth abdominal tergite forming a narrow, transverse band between bases of cerci on ventral side along anterior ventral margin of ninth tergite, separated by a fine furrow from process of ninth tergite and finely furrowed in midline ( Fig. 89B View FIGURE 89 ). Subgenital plate very short, slightly bilobate, much wider than long with a short medial furrow; styli inserted in lateral area of apical margin ( Fig. 89B View FIGURE 89 ). Phallus membranous.

Female. Seventh abdominal sternite normal, apical margin subtruncate, followed by a sclerotised transverse bulge with compressed apico-lateral angles. Subgenital plate consisting of a simple, rather thin lobe with, except for subparallel basal area, converging margins; apical margin rounded, subtruncate in middle, with marginal areas little stiffened and in midline with a faint furrow ( Fig. 88H View FIGURE 88 ). Ovipositor elongate straight with faintly approaching margins; tip with narrowed margins, subobtuse ( Fig. 88I View FIGURE 88 ).

Measurements (2 males, 1 female).—body w/wings: male 39, female 39; body w/o wings: male 30–31, female 30; pronotum: male 5.5, female 6.5; tegmen: male 28–29, female 29; tegmen width: male 10, female 10.5; hind femur: male 15.0–15.5, female 18; antenna: male 110; ovipositor: female 26 mm.

Etymology. The new species is named after the triangular shape of the male ninth abdominal tergite.


Zoologisches Forschungsmuseum Alexander Koenig

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