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Holotype, male (Fig. 16a). Length 2.81 mm. Color of antennae light ferruginous, pronotum black, remainder dark ferruginous. Body in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally convex. Rostrum with median and pair of indistinct submedian ridges; intervening furrows containing row of coarse punctures, with rows of erect scales; epistome with transverse, irregular ridge. Pronotum with sides subparallel in basal half, anteriorly rounded to indistinct subapical constriction; disk densely punctate; interspaces subglabrous; each puncture containing small recumbent seta. Elytra with striae marked by small punctures, each containing minute seta; intervals flat, subglabrous, with few interspersed punctures; sutural intervals with additional row of punctures; elytral apex pointed, densely coarsely punctate, suture incised. Femora with crenate anteroventral ridge. Metafemur subapically with stridulatory patch. Dorsal edge of tibiae with subbasal angulation, dentate in pro- and mesotibia. Abdominal ventrites 1–2 weakly concave to flat, subglabrous, with sparse erect scales; abdominal ventrite 5 flat, basally subglabrous, apically sparsely punctate, microreticulate, with sparse erect scales. Penis (Fig. 16b) with sides of body subparallel, slightly diverging; apex subtruncate, with median, triangular extension; endophallus containing numerous coarse denticles, apically with pair of sclerites; transfer apparatus digiform, slightly curved; apodemes 2.5 × as long as body; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 2.35–2.81 mm. Female rostrum dorsally subglabrous, with submedian row of coarse punctures, subapically punctate, sublaterally with sparse rows of subrecumbent scales; epistome simple. Female elytral apex simple.
Holotype (MZB): ARC0710 (EMBL # LM655535), E-Kalimantan Prov., Berau Dist., Hutan Wisata Sei Tangap, ca. 8 km W of Tanjungredeb, N02°08.07', E117°24.65', 30 m, 02-X-2008. Paratypes (MZB, SMNK): E-Kalimantan Prov., Berau Dist.: 9 exx, ARC0711 (EMBL # LM655536), ARC0712 (EMBL # LM655537), ARC0713 (EMBL # LM655538), same data as holotype; 1 ex, Hutan Mayang Mangurai, ca. 15 km SW of Tanjungredeb, N02°06.217', E117°24.003‘, 20m, 30-XI-2008.
E-Kalimantan Prov. (Tanjungredeb). Elevation: 20–30 m.
This epithet is based on the island of Borneo.
Trigonopterus bornensis Riedel, sp. n. was coded as “Trigonopterus sp. 311”.
- Riedel, A; Tänzler, R; Balke, M; Rahmadi, C; Suhardjono, Y; 2014: Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands ZooKeys, (467): 1-162. doi