Pseudotrigonidium Chopard, 1915

Desutter-Grandcolas, Laure, Anso, Jérémy & Jourdan, Hervé, 2016, Crickets of New Caledonia (Insecta, Orthoptera, Grylloidea): a key to genera, with diagnoses of extant genera and descriptions of new taxa, Zoosystema 38 (4), pp. 405-452 : 415

Genus Pseudotrigonidium Chopard, 1915

Pseudotrigonidium Chopard, 1915: 152 .

TYPE SPECIES. — Pseudotrigonidium sarasini Chopard, 1915 by original designation.

ILLUSTRATIONS. — Habitus: Fig. 2D ; Otte et al. 1987: fig. 21 (under Tremellia ); Anso et al. 2016a: fig. 5. Male genitalia: Otte et al. 1987: fig. 24 (under Tremellia ); Desutter-Grandcolas 1997a: figs 18-19 (under Tremellia ). Calling song: Anso et al. 2016a: fig. 4.

Male. Two stridulum conditions: 1) Stridulum complete and functional; harp with four or five oblique, parallel veins, the most distal one concave; mirror crossed by two parallel veins. CuP present and short; and 2) Stridulum lacking, in micropterous (a file sometimes present) and apterous species. Subgenital plate long, narrow and high. Male genitalia: pseudepiphallic sclerite very elongate (except in P. aptera Desutter-Grandcolas, 1997 and P. ana Anso & Desutter-Grandcolas, 2016 ); pseudepiphallic parameres well-developed, lateral, making wide, often indented plates; arc complete and wide; ectophallic apodemes short; ectophallic fold often hyperthelic, extending dorsally between pseudepiphallic lateral parts; endophallic sclerite U-shaped, most often elongate; endophallic apodeme crestlike; no dorsal cavity.

Female. FWs rounded, with thick longitudinal and transversal veins. Ovipositor short to very short; valve apex thick and rounded, with teeth. Female genitalia: copulatory papilla very small, annular with thicker anterior part.

DISTRIBUTION. — Diversified in Oceania and Indomalaysia. In New Caledonia, Pseudotrigonidium is known throughout the whole Grande Terre; it is not yet reported from the Loyalty Islands.

HABITAT. — Pseudotrigonidium inhabits the understorey of forest vegetation, where its is active at night. Winged males are often found singing under the leaves of Pandanus or treeferns. Pseudotrigonidium hides during the day either in plant structures, such as inside the stems of dead fern leaves, or in the leaf litter and dead plant material accumulated at the base of tree trunks.

Figures

FIG. 2. — New Caledonian Phalangopsidae Blanchard, 1845: A, Protathra centralis Desutter-Grandcolas, 2014, from Aoupinié, by night (modified from Desutter- Grandcolas et al. 2014); B, Parendacustes lifouensis Desutter-Grandcolas, 1997, male, from Lifou (Loyalty Islands); C, Caltathra amiensis Desutter-Grandcolas, 1997,from Col d’Amieu,by night (Photo PG);D, Pseudotrigonidium noctifolia Desutter-Grandcolas,1997,from Col d’Amieu,by night (Photo PG).Scale bars:5 mm.