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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.
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.
C-Sulawesi Prov. (Luwuk). Elevation 700–760 m.
In leaf litter of montane forest.
This epithet is a patronym in honor of “Mesa”, Raden Pramesa Narakusumo, curator of Coleoptera at the Indonesian National Zoological Collection. An invariable genitive.
Trigonopterus mesai Riedel, sp. n. was coded as “Trigonopterus sp. 490”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi