Trigonopterus carinirostris Riedel

Riedel, Alexander & Narakusumo, Raden Pramesa, 2019, One hundred and three new species of Trigonopterus weevils from Sulawesi, ZooKeys 828, pp. 1-153 : 1

13. Trigonopterus carinirostris Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 13a). Length 2.04 mm. Color of antennae and tarsi ferruginous; remainder black with bronze luster. Body subglobose; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with distinct median carina and pair of submedian carinae; median carina widening posteriorly, extending as wide glabrous costa onto forehead; intervening furrows each with sparse row of erect scales; epistome short, indistinct. Pronotum with disk coarsely punctate; interspaces subglabrous; basal margin medially extended, at middle subangulate. Elytra densely punctate with small punctures; interspaces subglabrous. Femora edentate; anteroventral ridge distinct, crenate; anterior surface rugose-punctate, dorsally with erect clavate scales. Metafemur dorsally denticulate; subapically with stridulatory patch. Tibial base dentiform, when leg extended tibial tooth overlapping femoral apex. Metatibia with dorsal edge denticulate. Abdominal ventrites 1-2 concave, subglabrous; ventrite 5 flat, in basal 1/2 with pair of shallow sublateral depressions, subapically punctate. Penis (Fig. 13b) with sides of body subparallel; apex with median, subtriangular extension; apodemes 2.8 × as long as body of penis; transfer apparatus flagelliform, ca. 2.5 × length of body of penis; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 1.90-2.06 mm. Female rostrum dorsally flattened, with ridges less distinct. Female abdominal ventrite 5 flat.

Material examined.

Holotype (MZB): ARC3221 (GenBank # MK260428), S-Sulawesi Prov., Mangkutana, 02°20.306'S 120°46.792'E, 909 m, sifted, 14-V-2013. Paratypes (MZB, SMNK): S-Sulawesi Prov.: 4 exx, ARC3229 (GenBank # MK260427), ARC3230 (GenBank # MK260429), ARC3231 (GenBank # MK260430), Mangkutana, 02°20.203'S 120°46.878'E, 903 m, sifted, 14-V-2013.

Distribution.

S-Sulawesi Prov. (Mangkutana). Elevation 900-910 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is an adjectival combination of the Latin nouns carina (keel) and rostrum (snout) with the second adjectival declension ending -is and refers to the dorsal sculpture of the rostrum.

Notes.

Trigonopterus carinirostris Riedel, sp. n. was coded as " Trigonopterus sp. 479".