Trigonopterus silvicola Riedel

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

91. Trigonopterus silvicola Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 91a). Length 2.20 mm. Color of legs and head ferruginous; remainder black. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum in front of eye with distinct lateral constriction; dorsally with median and pair of submedian ridges; intervening furrows with sparse rows of subrecumbent setae; epistome short, posteriorly with transverse, angulate ridge. Pronotum with disk densely coarsely punctate; each puncture containing fine, recumbent seta; with impunctate median ridge; towards sides punctures becoming larger, with reticulate interspaces. Elytra with striae marked by small punctures, each with indistinct recumbent seta; intervals subglabrous, with few interspersed punctures. Femora edentate. Meso- and metafemur with anteroventral ridge crenate. Metafemur with dorsoposterior edge weakly denticulate-crenate; subapically with stridulatory patch. Metatibia at middle ventrally with short row of setae. Abdominal ventrite 1 concave, sparsely punctate, microreticulate; ventrite 5 punctate, at middle and sublaterally with shallow depressions. Penis (Fig. 91b) with sides of body subparallel; apex subangulate, with short median extension, sparsely setose; apodemes 2.4 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.14-2.24 mm. Female rostrum in apical 1/2 subglabrous with submedian rows of punctures and sublateral furrows; without distinct epistome. Female metatibia ventrally simple, with sparse setae.

Material examined.

Holotype (MZB): ARC3270 (GenBank # MK260568), C-Sulawesi Prov., Luwuk, Salodi, Gn. Taluanjang, 00°49.202'S 122°52.395'E, 702 m, sifted, 21-V-2013. Paratypes (MZB, SMNK): Luwuk, Salodi, Gn. Taluanjang: 5 exx, ARC3271 (GenBank # MK260566), ARC3272 (GenBank # MK260565), ARC3273 (GenBank # MK260567), same data as holotype; 2 exx, 00°49.264'S 122°52.343'E, 759 m, sifted, 21-V-2013; 3 exx, 00°49.307'S 122°52.322'E, 760 m, sifted, 21-V-2013.

Distribution.

C-Sulawesi Prov. (Luwuk). Elevation 700-760 m.

Biology.

In leaf litter of lower montane forest.

Etymology.

This epithet is the Latin noun silvicola (sylvan, forest dweller) in apposition.

Notes.

Trigonopterus silvicola Riedel, sp. n. was coded as " Trigonopterus sp. 524".