Trichophallus tabubil, Ingrisch, 2024

Ingrisch, Sigfrid, 2024, Revision of the genus Trichophallus Ingrisch, 1998 with notes on the genera Secsiva Walker, 1869 and Subrioides C. Willemse, 1966 (Orthoptera: Tettigoniidae: Conocephalinae: Agraeciini), Zootaxa 5442 (1), pp. 1-66 : 28-30

Trichophallus tabubil sp. nov.

Fig. 11

Holotype (male): Papua New Guinea: Papua New Guinea: Tabubil , 1 October–30 November 1975, coll. T. Roberts — 1 male ( NHM London).

Other specimens studied: The type is unique.

Diagnosis. T. tabubil is similar to T. hamatus but slightly larger, has shorter but stouter cerci with a larger internal process; the epiproct terminates into a prolonged, narrow apical process, and the titillators of the phallus have the apical spines more delicate and both with acute end instead of having the more proximal spine obtuse as in T. hamatus .

Description. Large species. fastigium verticis before eyes 0.7; fastigium verticis from base 0.9; dorsal eye length 1.4; greatest diameter of eye 1.4 mm; index fastigium verticis from base: eye length 0.7; index fastigium verticis from base: greatest eye diameter 0.7. Tegmen reaching apical quarter of hind tibia. Femora with the following number of spines on ventral margins: fore femur 5–6 external, 4 internal; mid femur 6–7 external, 3 internal near base; hind femur 11–12 external,11–14 internal.

Male. Stridulatory file slightly concave, near apex re-curved; 1.4 mm long; with 130 teeth or 95.3 teeth per mm, in middle of file with 94.2 teeth per mm; teeth narrow and dense, near apex indistinct; mirror hind margin rounded; 0.8 mm long 0.9 mm wide; index length:width = 0.8.

Tenth abdominal tergite with apical margin angularly projecting at both sides of midline, angularly excised in between. Epiproct Y-shaped with basal area furrowed in midline. Epiproct in T. tabubil strongly prolonged into a narrow apical projection while in T. hamatus prolonged into a relatively shorter and wider narrow apical projection. Paraprocts with long, compressed and straight projections. Cerci curved in basal half, conical and straight in apical half; with a large acute-angular internal tooth just behind middle. Subgenital plate with a short rounded excision at apex; styli much longer than excised area. Titillators with basal half simple, compressed-band-shaped, curved; apical half more strongly sclerotised, stiffened and projecting ventrad-apicad, terminating at end into a larger dorsal and a narrow ventral, curved acute tip; at dorsal-proximal side these sclerites are connected with membranous, about semi-circular bursae with hairy rim.

Female. Unknown.

Coloration. Yellowish brown with all marks (patterns 0 to 4).

Measurements of male.—body: 25; pronotum: 5.8; tegmen: 37; hind femur: 18.5 mm.

Etymology. Named after the type locality, noun in apposition.

Figures

FIGURE 11. Trichophallus tabubil sp. nov. male holotype: A, male habitus; B, stridulatory file; C, end of abdomen with tenth tergite and cerci; D, end of abdomen with subgenital plate and cerci in ventral view; E, epiproct with prolonged narrow apical area; F–H, titillators in dorso-proximal (F), ventro-apical (G), and lateral view (H).