Jambiliara angula, Ingrisch & Tan, 2012

Ingrisch, Sigfrid & Tan, Ming Kai, 2012, New Taxa Of Agraeciini (Orthoptera: Tettigoniidae: Conocephalinae) From Singapore And Malaysia With A Review Of The Genus Jambiliara, Raffles Bulletin of Zoology 60 (1), pp. 137-155 : 147-148

publication ID

https://doi.org/ 10.5281/zenodo.5347125

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scientific name

Jambiliara angula

sp. nov.

Jambiliara angula View in CoL , new species

Figs. 6A View Fig , 7E, F View Fig , 8C View Fig , 9G, H View Fig , 10G, H View Fig

Material examined. — Holotype: male ( BMNH), Malaysia: Penang, Sungei, Batu Feringgi [5°28'N, 100°15'E], dropped on jungle path from the canopy, coll. H. T. Pagden, 22 Jan.1956. GoogleMaps

Diagnosis. — The new species differs from J. macroptera and J. selita by the stridulatory apparatus with the mirror on left tegmen being short and the mirror on right tegmen having the hind margin angular, the male cerci terminating into a triangular apex, and the titillators having the apical margin granulated unto the terminal structure of the dorsal process. The arrangement of teeth of the stridulatory file with 51 teeth per mm resembles the situation in J. macroptera but not in J. selita , while male subgenital plate and styli resemble J. selita but not J. macroptera .

Description. — As genus. Fastigium verticis conical with weak dorsal furrow; apex obtuse, nearly truncate. Pronotum with apical area little elevated, widened, shouldered and with medial carinula; humeral sinus distinct but not strong. Mesosternal lobes conical, acute. Femora with the following number of spines on ventral margins: profemur 0–1 external, 3 internal; mesofemur 3 external, 0 internal; postfemur 8–9 external, 5–7 internal.

Male: Stridulatory area of left tegmen as in Fig. 7E, F View Fig . Stridulatory file regularly curved with densely arranged teeth; 3.1 mm long, with 157 teeth, equating 51 teeth per mm; in middle of file with 43 teeth per mm ( Fig. 8C View Fig ). Mirror on right tegmen with hind margin angularly projecting; 2.35 mm long, 1.91 mm wide; index length to width 1.23 ( Fig. 7F View Fig ). Tenth abdominal tergite with dorsal area very little prolonged, surface nearly flat with shallow but wide medial furrow; apical margin in middle excised with truncate bottom and spinose projection on both sides of excision ( Fig. 9H View Fig ). Epiproct triangular; dorsal surface faintly grooved; margins carinate. Paraproctes with tuberculate projection. Cerci short cylindrical, curved; apex conical, obtuse with short stylate pre-apical internal tooth; before tooth, on ventro-internal margin, with a long, compressed, curved projection pointing interno-ventrad, at tip with proximal angle obtuse, distal angle little prolonged into acute cone ( Fig. 9G, H View Fig ). Subgenital plate longer than wide; mainly in lateral areas setose; triangularly excised from base; in ventral view basal half wider than apical half; about apical third curved dorsad in a 90°-angle or little more, not visible from below; in apical view margin on both sides of excision with distinct right-angular constriction at base of compressed projections; projections with concave internal surface, before apex with reduced tuberculate stylus ( Fig. 9G View Fig ). Titillators fused in middle; basal parts deviating, with nearly parallel margins to base; very base with margin partly recurved, irregular and furrowed; apical parts divided from fused central area into a pair of plates supporting the membranous phallus lobes and a subfused dorsal process; apical part of process triangular, widened, thickened and standing vertically to the plates; apical margin of apical plates granulated with granules almost reaching terminal structure of process ( Fig. 10G–I View Fig ). Membranous part of phallus near titillator apex densely setose.

Female: Unknown.

Colouration: Brown. Frons medium brown, in middle less dark; labrum and genae yellowish brown; mandibles with internal and apical areas black; lateral areas of scapus and pedicellus black. Compound eyes with narrow black band. Vertex at hind margin with two black spots. Pronotum with narrow irregular black lateral bands. Abdomen with intersegmental membranes surrounding sternites black. Tegmen maculated. Hind wings at base almost transparent, otherwise with greyish brown infumation. Legs indistinctly maculated.

Measurements (1 male): Body with wings: 36; body without wings: 27; pronotum: 8.2; tegmen: 27; hind femur: 20.5; antenna: 140 mm.













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