Trigonopterus silaliensis Van Dam & Riedel

Van Dam, Matthew H., Laufa, Raymond & Riedel, Alexander, 2016, Four new species of Trigonopterus Fauvel from the island of New Britain (Coleoptera, Curculionidae), ZooKeys 582, pp. 129-141 : 134

Taxon classification Animalia Coleoptera Curculionidae

Trigonopterus silaliensis Van Dam & Riedel sp. n.

Diagnostic description.

Holotype, female (Fig. 4 a–c). Length 3.02 mm. Color black; elytra with humeri and apical third dark ferruginous; antenna paler ferruginous. Body elongate; in dorsal aspect with marked constriction between pronotum and elytra; in profile dorsally flat. Rostrum basally with median and pair of submedian carinae; in apical half relatively smooth, with submedian row of punctures. Forehead coarsely punctate-rugose, with cream-colored, narrow scales directed backwards. Pronotum with sides convex, without subapical constriction; disk dorsally flat, punctate, at middle subglabrous, punctures sparse; anterolaterally punctures coarse, partly confluent; at middle of basal margin with small patch of dense, cream-colored recumbent scales. Elytra with striae distinct, dorsally with rows of small punctures, laterally with deep punctures; intervals flat, subglabrous; with small, scattered patches of cream-colored, recumbent scales. Legs. Femora edentate; coarsely punctate, with white, recumbent piliform scales. Profemur in basal third posteriorly with callus. Metafemur dorsally with white scales wider and more densely; subapically with stridulatory patch. Abdominal ventrites flat, with fine punctures bearing piliform scales. Genitalia. Fig. 4b.

Material examined.

Holotype (ANIC): ARC4214 (GenBank # KU888894), PAPUA NEW GUINEA, West New Britain Prov.: E of Silali Village, Nakanai Range, S05°31.233', E151°03.343', 800 m, from foliage, 21-22-XI-2014.

Etymology.

This epithet is a Latin adjective based on the name of the village near to which the holotype was collected.

Notes.

This species belongs to the Trigonopterus honestus -group of Riedel et al. (2013b) and superficially resembles Trigonopterus paucisquamosus (Heller) from the Philippines, which differs by the position of scale patches and a denser punctation.