Trichophallus augustus, 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 : 30-32

Trichophallus augustus sp. nov.

Fig. 12

Holotype (male): Papua New Guinea: Neu Guinea, Kaiserin Augustafluss Expedition 328, Lager am Lehmfluss, 3 May 1913, coll. Bürgers ( ZMHB Berlin).

Allotype (female): same data as holotype, 1 female ( ZMHB Berlin)

Other specimens studied: Neu Guinea, Kaiserin Augustafluss Expedition 55, Pionierlager , 1 May–30 June 1912 (coll. Bürgers)— 1 male ( ZMHB Berlin ); Indonesia, Papua: Neth. Ind.-Amer. New Guinea Exp. 1938–39. Bernhard Camp , elev. 50 m (3°29‘S, 139°13‘E), 1–31.vii.1938, coll. J. Olthof — 1 male ( MBBJ Bogor) .

Diagnosis. The new species is unique within the genus for the hump-shaped internal projection of the male cerci and the apical projection of the cerci running from the underside and in prolongation of the cercus axis, thus that it appears as a prolonged cercus. The male titillators have the apical area that carries long bristles whitish transparent although somewhat stiffened. Females can be identified by the shape of the subgenital plate as described below.

Description. Medium sized species. Tegmina surpassing middle of hind tibiae. Femora with the following number of spines on ventral margins: fore femur 6–7 external, 4–6 internal; mid femur 6–7 external, 3–5 internal near base; hind femur 12–13 external, 14–16 internal.

Male. Stridulatory file with about 110–112 teeth. Tenth abdominal tergite terminating into two triangular projections, widely excised in between. Epiproct roughly quadrate or widening backwards, in middle of dorsal surface little depressed, apico-lateral angles broadly rounded, apical margin truncate in middle. Cerci narrow, with a large, hump-shaped, internal projection in about mid-length, tip of projection obtuse with a minute, acute spinule; apical area of cercus with obtuse end and from underside with an elongate, obtuse projection. Subgenital plate with a long excision at apex; styli little shorter than excised area or of about same length.

Titillators separate with sclerotised area reaching to little behind mid-length, apical area consists of membranous structures; central areas strongly approached to each other; apical margin slightly convex but somewhat irregular; in prolongation of apices forming small membranous bags that are supported by a very short stiffened area with concave apex and the dorsal-proximal angle is greatly prolonged into a long and very narrow, weak sclerite; internal surface of the small bags with a row of long bristles, external surface with tufts of medium long, pale hairs; ventral angle roundly projecting and granular; dorsal angle conically projecting with tufts of hairs on external surface.

Female. Subgenital plate in ventral view roughly shaped as a triangular bowl of which the bottom has a large ovoid hole, the apical angle is cut out, and the basal margin shifted a little posteriorly; basal-lateral areas broadly expanded dorsad, behind carinae separating them from ventral plate there is a furrow, another carina, again a furrow and the dorsal margin swollen. Eight abdominal tergite with lateral-posterior area excised for about half of tergum length. Ventral ovipositor valves with ventral margin roundly swollen and setose, as a whole embraced by the subgenital lobes; dorsal margin at base with a round setose lobe of medium length.

Coloration. Yellowish brown with patterns 0-1-4. Legs indistinctly maculated; hind femur indistinctly striated and dorsal and apical areas stippled.

Measurements.—body: male 21–22, female 24; pronotum: male 5.7, female 5.5; tegmen: male 32–34, female 33.5; hind femur: male 16.0–16.5, female 16.5; antenna: male 76, female 70; ovipositor: 11 mm.

Etymology. Named in memory of the Augustafluss Expedition in 1913.

Figures

FIGURE 12. Trichophallus augustus sp. nov.:A–H, male:A, stridulatory file; B, last abdominal tergite and cerci in dorsal view; C, subgenital plate and cerci in ventral view; D, cercus of holotype in ventral view; E–H: titillators in different views (E–F of male from Pinonierlager; G–H of holotype from Lehmfluss): E, apical view; F–G, ventro-apical view (in F apical area flipped in a 90° angle); H, oblique view).—I–K, female allotype: base of ovipositor and subgenital plate in oblique lateral (I) and in ventral view (J); K, ovipositor.—Abbreviations: be basal extension of subgenital plate; lo lobe of ventral ovipositor valve; sg subgenital plate; ov base of ovipositor.