Trichophallus reductus, 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 : 41-42

Trichophallus reductus sp. nov.

Fig. 19

Holotype (female): Papua New Guinea: West Sepik Prov., S. Toricelli Mts, Sand River , 1 July–31 August 1986 (coll. B. Oudmayer)— 1 female (Naturalis Leiden).

The type is unique.

Diagnosis. The new species can be readily recognised by the shape of the female subgenital plate which has the central plate strongly reduced to a short lobe with convex apical margin and a faint medial furrow. The plate is about half as long as its basal-lateral extensions and thus hidden in lateral view (Fig. D). The basal-lateral extensions reach but do not overlap with the projecting ovoid lobes of the ventral ovipositor valves (Fig. E).

Description. Small and very slender species. Tegmina surpassing hind knees. Mesosternal lobes angularly rounded. Femora with the following number of spines on ventral margins: fore femur 4–6 external, 5 internal; mid femur 6 external, 3 internal near base; hind femur 9–10 external, 7–9 internal.

Male. Unknown.

Female. Subgenital plate short, entire basal area shallowly grooved over whole width; then divided into two wide and short lobes touching each other in midline and with apices obliquely truncate; basal-lateral areas separated by a narrow but distinct furrow from ventral plate, short and projecting backwards, not dorsad. Ovipositor only moderately widened around mid-length. Dorsal margin of ventral ovipositor valves at base with a large auricular projection just behind basal-lateral projection of subgenital plate, both nearly touching each other. Eight abdominal tergite with lateral-posterior angles obliquely truncate.

Coloration. Yellowish brown with patterns 1 and 3.

Measurements of female.—body: 20; pronotum: 5; tegmen: 25; hind femur: 14.5; ovipositor: 9.5 mm.

Etymology. The name of the new species refers to the strongly reduced main area of the female subgenital plate.

Figures

FIGURE 19. Trichophallus reductus sp. nov. holotype female:A, habitus lateral view; B, ovipositor; C–E, end of abdomen with subgenital plate in ventral view (C, E) and in oblique lateral view (D).—Abbreviations: at abdominal tergite; be basal dorsal extension of subgenital plate; dp basal projection of ventral ovipositor valve; sg main area of subgenital plate.