Trigonopterus costatus Riedel

Riedel, Alexander, Sagata, Katayo, Surbakti, Suriani, Rene Taenzler, & Michael Balke,, 2013, One hundred and one new species of Trigonopterus weevils from New Guinea, ZooKeys 280, pp. 1-150 : 18

17. Trigonopterus costatus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 17a). Length 2.12 mm. Color black; antenna light ferruginous; legs deep ferruginous. Body subovate, with shallow constriction between pronotum and elytron; in profile evenly convex. Rostrum in basal half medially carinate, with pair of sublateral furrows posteriorly converging on forehead; weakly punctate, sparsely setose; epistome with transverse, angulate ridge. Pronotum with subapical constriction dorsally distinct, laterally indistinct; disk with longitudinal impressions, sparsely punctate, sparsely setose. Elytra with striae deeply incised, towards sides with deep interspersed punctures; intervals costate-carinate, subglabrous, with sparsely setose with minute recumbent setae; apex rounded. Femora edentate. Metafemur with simple dorsoposterior edge, in apical third with transverse row of small suberect setae, subapically with stridulatory patch. Abdominal ventrite 5 basally with pair of teeth. Aedeagus (Fig. 17b) apically subangulate, glabrous; with complex, symmetrical transfer apparatus; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.06-2.12 mm. Female rostrum in basal half with median carina less distinct.

Material examined.

Holotype (MZB): ARC0767 (EMBL # HE615450), WEST NEW GUINEA, Manokwari, Mt. Meja, S00°51.497', E134°04.949', 220 m, 05-XII-2007, sifted. Paratypes (SMNK, ZSM): WEST NEW GUINEA, Manokwari, Mt. Meja: 2 exx, ARC766 (EMBL # HE615449), ARC0768 (EMBL # HE615451), same data as holotype; 6 exx, S00°51.400', E134°04.918', 225 m, 06-XII-2007, sifted; 1 Ex, 200 m, 30-XII-2004.

Distribution.

Manokwari Reg. (Mt. Meja). Elevation: 220-225 m.

Biology.

Sifted from leaf litter in lowland forest.

Etymology.

This epithet is based on the Latin adjective costatus (ribbed) and refers to the elytral sculpture.

Notes.

Trigonopterus costatus Riedel, sp. n. was coded as " Trigonopterus sp. 202" by Tänzler et al. (2012).