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Holotype, male (Fig. 14a). Length 2.55 mm. Color of antennae ferruginous; legs and base of 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, before apex rounded to subapical constriction; disk with pair of distinct longitudinal impressions, medially broadly swollen, densely punctate with coarse punctures, narrow interspaces subglabrous, with narrow median costa; with yellowish slender recumbent scales. Elytra sparsely punctate with minute punctures; at humeral angles with some coarse punctures; striae hardly marked by hairlines; in basal 1/3 and subapically with sparse yellow recumbent scales. Femora dentate, with acute tooth; anteroventral ridge of meso- and metafemur crenate. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Metatibia subbasally widened, dorsal edge serrate. Metatibia curved. Abdominal ventrites 1–2 concave, subglabrous, sparsely punctate, with few scattered piliform scales; ventrite 5 concave, sparsely punctate. Penis (Fig. 14b) with sides of body subparallel, subapically widened forming knobs with tufts of long curly setae; apodemes 3.3 × as long as body of penis; transfer apparatus flagelliform, 3.5 × longer than body of penis; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.25–2.55 mm. Female rostrum dorsally with median and pair of submedian glabrous costae; epistome simple. Female ventrite 5 flat.
Holotype (MZB): ARC2832 (GenBank # MK260387), S-Sulawesi Prov., Pc. Palopo, Gn. Sampuna, 02°56.545'S 120°05.595'E, 1101 m, sifted, 29-V-2012. Paratypes (MZB, SMNK): S-Sulawesi Prov.: 9 exx, ARC2833 (GenBank # MK260389), ARC2834 (GenBank # MK260390), ARC2835 (GenBank # MK260388), same data as holotype; 20 exx, Pc. Palopo, Gn. Sampuna, 02°56.545'S 120°05.595'E, 1101 m, sifted, 02-V-2013.
S-Sulawesi Prov. (Pc. Palopo). Elevation ca. 1100 m.
In leaf litter of montane forest.
This epithet is an adjectival combination of the Latin adjective castaneus, -a, -um (chestnut brown) and noun penna (wing, elytron), with the second declension adjectival ending -is.
Trigonopterus castaneipennis Riedel, sp. n. was coded as “Trigonopterus sp. 419”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi