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

Jambiliara angula , new species

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

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.

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 . 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 ). 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 ). 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 ). 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 ). 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 ). 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 ). 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.

Figures

Fig. 6. Jambiliara species: A–C, E–G, habitus with spread wings in dorsal view; D, I, face; H, habitus in lateral view. – A, J. angula n. sp. male holotype; B–D, J. macroptera Ingrisch, 1998 (B, male from Mt. Bandahara; C, D, female holotype); E–G, J. selita n. sp. (E, male holotype; F, male paratype; G, female paratype from Perak); H, I, J. moultonii (Karny, 1923) female holotype. The arrow points at the antennal scrobus. Scale bars = 10 mm. (Photographs by: S. Ingrisch [A–I except F] and M. K. Tan [F]).

Fig. 7. Male stridulatory area of left (A, C, E) and right (B, D, F) tegmen of Jambiliara species: A, B, J. macroptera Ingrisch, 1998 from Mt. Bandahara; C, D, J. selita n. sp. holotype; E, F, J. angula n. sp. holotype. (Photographs by: S. Ingrisch).

Fig. 8. Male stridulatory file on underside of left tegmen of Jambiliara species: A, J. macroptera Ingrisch, 1998 from Mt. Bandahara; B, J. selita n. sp. holotype; C, J. angula n. sp. holotype. Scale bar = 1 mm. (Photographs by: S. Ingrisch).

Fig. 9. Male abdominal apex of Jambiliara species: A, B, in oblique dorsal view; C, H, in dorsal view; D, G, in apical view; E, F, apex of subgenital plate in apical view (E, in dried specimen with styli collapsed; F, in fresh specimen with styli firm): A, B, J. macroptera Ingrisch, 1998 from Mt. Bandahara; C–F, J. selita n. sp. (C–E, holotype; F, paratype); G, H, J. angula n. sp. holotype. Abbreviations: 10t, tenth abdominal tergite; ce, cercus; e, epiproct; pa, paraproct; pr, projection of subgenital plate; sg, subgenital plate; s, stylus. The arrows point at the tooth or constriction of the subgenital plate lobes. Scale bar = 1 mm. (Photographs by: S. Ingrisch [A–H except F] and M. K. Tan [F]).

Fig. 10. Male titillators of Jambiliara species in dorsal view (A, C, F, G) and dorso-apical view (B, D, H, I): A, B, J. macroptera Ingrisch, 1998 from Mt. Bandahara; C–F, J. selita n. sp. (C–E, holotype; F, paratype); G–I, J. angula n. sp. holotype. Abbreviations: bs, baso-lateral sclerite; ls, small lateral sclerite. The arrows point at the different serrulation of the titillator margin. Scale in G for upper row and H, in B for middle row and E. Scale bars = 1 mm. (Photographs by: S. Ingrisch [A–I except F] and Y. C. Ang [F]).