Trigonopterus mesai Riedel

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

50. Trigonopterus mesai Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 50a). Length 2.04 mm. Color of antennae and legs ferruginous; elytra dark ferruginous; remainder black. Body subovate; in dorsal aspect with moderate constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median and pair of submedian ridges; intervening furrows with sparse, erect scales; epistome short, posteriorly with transverse ridge. Pronotum with lateral edges weakly converging, with weak subapical constriction; disk with pair of distinct longitudinal impressions, lined with sparse yellow almond-shaped scales; medially broadly swollen, densely punctate with coarse punctures, with narrow subglabrous midline. Elytra densely irregularly punctate; striae 1-3 weakly impressed; with sparse yellow recumbent scales, especially in basal 1/3 and near middle. Femora dentate, with acute tooth; anteroventral ridge of meso- and metafemur crenate. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Dorsoposterior edge of tibiae subbasally denticulate. Metatibia weakly curved. Abdominal ventrites 1-2 concave, subglabrous, with few coarse punctures; ventrite 5 at middle weakly concave, with sparse coarse punctures and sparse erect setae. Penis (Fig. 50b) with sides of body subparallel, apex subtruncate, with sparse setae; apodemes 3.4 × as long as body of penis; transfer apparatus flagelliform, 3.0 × longer than body of penis; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 1.92-2.20 mm. Elytra with or without yellow scales. Female rostrum slender, dorsally in apical 1/2 subglabrous, with submedian row of punctures and with pair of sublateral furrows.

Material examined.

Holotype (MZB): ARC3267 (EMBL # LN884981), C-Sulawesi Prov., Luwuk, Salodi, Gn. Taluanjang, 00°49.202'S 122°52.395'E, 702 m, sifted, 21-V-2013. Paratypes (MZB, SMNK): C-Sulawesi Prov.: 6 exx, ARC3268 (GenBank # MK260467), ARC3269 (GenBank # MK260466), ARC6020 (GenBank # MK260465), ARC6021 (GenBank # MK260464), same data as holotype; 7 exx, Luwuk, Salodi, Gn. Taluanjang, 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 montane forest.

Etymology.

This epithet is a patronym in honor of “Mesa”, Raden Pramesa Narakusumo, curator of Coleoptera at the Indonesian National Zoological Collection. An invariable genitive.

Notes.

Trigonopterus mesai Riedel, sp. n. was coded as " Trigonopterus sp. 490".