Trigonopterus bornensis Riedel

Riedel, Alexander, Taenzler, Rene, Balke, Michael, Rahmadi, Cahyo & Suhardjono, Yayuk R., 2014, Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands, ZooKeys 467, pp. 1-162 : 17

Taxon classification Animalia Coleoptera Curculionidae

16. Trigonopterus bornensis Riedel sp. n.

Diagnostic description.

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.

Material examined.

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.

Distribution.

E-Kalimantan Prov. (Tanjungredeb). Elevation: 20-30 m.

Etymology.

This epithet is based on the island of Borneo.

Notes.

Trigonopterus bornensis Riedel, sp. n. was coded as " Trigonopterus sp. 311".