Trigonopterus viduus Riedel

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

100. Trigonopterus viduus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 100a). Length 2.18 mm. Color of antennae and tarsi ferruginous; legs dark ferruginous; remainder black. Body subovate; in profile dorsally convex. Rostrum dorsally with median and pair of submedian carinae widening posteriorly, extending as glabrous costae onto forehead; intervening furrows with sparse rows of recumbent setae; epistome at middle with denticle. Pronotum with disk densely punctate; interspaces between punctures subglabrous, subequal or smaller than punctures´ diameter; laterally punctures coarse. Elytra with striae marked by small punctures, weakly impressed; intervals subglabrous, with rows of minute punctures; stria 8 in basal 1/2 with larger punctures, externally bordered by costa. Femora with anteroventral ridge crenate, in mesofemur and metafemur ending with tooth; anterior surface coarsely punctate, microreticulate. Metafemur with dorsoposterior edge simple; subapically with stridulatory patch. Abdominal ventrites 1-2 concave, markedly microreticulate, weakly punctate; ventrite 5 at middle with shallow pit, markedly microreticulate, punctate, subapically with squamose scales. Penis (Fig. 100b) with sides of body subparallel; apex subangular, medially extended into small tooth; with few long setae; apodemes 2.3 × as long as body of penis; transfer apparatus S-shaped, basally held by capsule; ductus ejaculatorius with distinct bulbus. Intraspecific variation. Length 1.78-2.28 mm. Female rostrum more slender, epistome indistinct. Female abdominal ventrite 5 flat.

Material examined.

Holotype (MZB): ARC3135 (GenBank # MK260581), C-Sulawesi Prov., Pendolo, Boe, 02°05.405'S 120°38.551'E, 857 m, sifted, 15-V-2013. Paratypes (MZB, SMNK): C-Sulawesi Prov.: 9 exx, ARC6014 (GenBank # MK260579), ARC6015 (GenBank # MK260582), ARC6016 (GenBank # MK260580), same data as holotype; 6 exx, Pendolo, Boe, 02°05.440'S 120°38.537'E, 901 m, sifted, 15-V-2013; 4 exx, Pendolo, Boe, 02°05.446'S 120°38.519'E, 915 m, sifted, 15-V-2013.

Distribution.

C-Sulawesi Prov. (Pendolo). Elevation 860-915 m.

Biology.

In leaf litter of lower montane forest.

Etymology.

This epithet is the Latin adjective viduus, -a, -um (widowed).

Notes.

Trigonopterus viduus Riedel, sp. n. was coded as " Trigonopterus sp. 527".