Trichophallus spinosus, 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 : 46

Trichophallus spinosus sp. nov.

Fig. 22

Holotype (male): Indonesia: Misool Island (West), elev. 0–75 m, 8 September–20 October 1948 (coll. M.A. Lieftinck), (Naturalis Leiden).

Other specimens studied: The type is unique.

Diagnosis. The new species is unique for the shape of the male cerci and the titillators. Thus it is useful to describe it despite of the rather bad preservation of the specimen. The cerci are elongate, straight in basal half, then slightly curved and little narrowing toward obtuse tip; from proximal surface of end of cercus provided with a long, narrow, and straight projection with little curved, acute tip. The titillators are fused in about basal halve, then separated and slightly sinuate and with re-curved, acute tips; from subbasal area of apical halve and connected by a narrow membranous area provided with compressed, long and strongly curved projections that afterward become narrow and rounded and at tip spinose.

Description. Medium sized to smaller species. Femora with the following number of spines on ventral margins: fore femur 5–7 external, 5 internal; meso- and hind femur missing.

Male. Stridulatory file with about 108 teeth. Tenth abdominal tergite terminating into two triangular lobes with rounded angles; apex angularly excised in between. Epiproct triangularly rounded with a pit in centre. Paraprocts with obtuse projections. Cerci conical, internal surface flattened; circa apical third curved mediad and with a long and narrow, slightly curved, apical-internal projection with acute tip. Subgenital plate with apex roundly excised; styli slightly longer than excised area.

Titillators with basal-central area fused, end of fused area truncate with a faint excision in middle, completely separated from apical parts which are forming a pair of a little twisted tubes which are strongly curved at apex and have the apical margin spinulose, their lateral margins connected with large, hyaline sacs; with an additional pair of apical sclerites that are completely separated from both the basal and the apical parts of titillators but connected by membranes at about transient area. Apical sclerites strongly curved with curve separating a wider but short basal from a very long and narrow, slightly curved apical area with pointing acute apex. Tiny hairs stand along the membranous rim along tip of phallus (Figs B + D)

Female. Unknown.

Coloration. Yellowish brown with patterns 1–4. Antennae annulated but scapus and pedicellus unicolored. Legs dotted.

Measurements of male.—body: 23; pronotum: 5; tegmen: 31.5 mm; hind femur: broken.

Etymology. T. spinosus sp. nov. is named for the long spear-shaped or spine-like projections of the titillators; from Latin spinosus = spiny.

Figures

FIGURE 22. Trichophallus spinosus sp. nov. male (holotype): A, stridulatory file; B–D, titillators in dorso-cranial (B), ventroapical (C) and oblique lateral (D) views; E, habitus; F–G, abdominal apex with subgenital plate and cerci in lateral (F) and in ventral view (G).