Trigonopterus prismae Riedel

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

65. Trigonopterus prismae Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 65a). Length 2.36 mm. Color of antennae yellowish-ferruginous; legs and head ferruginous; remainder black with bronze luster. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median and pair of submedian, somewhat irregular ridges; intervening furrows with sparse rows of subrecumbent setae; epistome posteriorly with transverse, angulate ridge. Pronotum with disk densely punctate with coarse punctures except along impunctate median line; interspaces between punctures subglabrous, subequal to or smaller than punctures´ diameter. Elytra with striae marked by small punctures; intervals subglabrous; sutural interval in basal 1/2 with row of small punctures; basal margin bordered by transverse row of punctures; laterally forming ridge along humerus; stria 8 along humerus with four larger punctures. Femora edentate. Meso- and metafemur with anteroventral ridge crenate. Metafemur with dorsoposterior edge weakly denticulate; subapically with stridulatory patch. Abdominal ventrite 1 concave, punctate, with sparse erect piliform scales, microreticulate; ventrite 5 at middle with broad shallow pit, punctate, basally and sublaterally with sparse erect scales. Penis (Fig. 65b) with sides of body subparallel; with narrow lateral flanges; apex with median dentiform extension, sparsely setose; apodemes 2.3 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 1.76-2.36 mm. Female rostrum in apical 1/2 subglabrous with submedian and sublateral rows of punctures; without distinct epistome. Female abdominal ventrite 1 subglabrous, ventrite 5 flat.

Material examined.

Holotype (MZB): ARC3218 (GenBank # MK260539), S-Sulawesi Prov., Mangkutana, 02°20.306'S 120°46.792'E, 909 m, sifted, 14-V-2013. Paratypes (MZB, SMNK): S-Sulawesi Prov.: 28 exx, ARC3217 (GenBank # MK260538), ARC3219 (GenBank # MK260540), ARC3220 (GenBank # MK260541), same data as holotype; 21 exx, Mangkutana, 02°20.203'S 120°46.878'E, 903 m, sifted, 14-V-2013.

Distribution.

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

Biology.

In leaf litter of montane forest.

Etymology.

This epithet honors the senior author’s wife, Prisma Riedel. An invariable genitive.

Notes.

Trigonopterus prismae Riedel, sp. n. was coded as " Trigonopterus sp. 514".