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Holotype, male (Fig. 27a). Length 1.82 mm. Color of antennae and tarsi ferruginous; remainder black. Body subovate, in dorsal aspect and in profile with weak constriction between pronotum and elytron. Rostrum with median ridge and pair of indistinct submedian ridges, intervening furrows each with sparse row of mesad directed setae; epistome simple. Pronotum coarsely punctate, rugose, with median costa; with sparse, slender, subrecumbent scales. Elytra with striae deeply impressed, each with row of short suberect scales; intervals costate, subglabrous; in basal half incised suture bordered by row of punctures. Femora with simple, crenate anteroventral ridge. Metafemur subapically with stridulatory patch. Metatibia apically with slender, slightly posteriad curved uncus; with premucro. Abdominal ventrite 5 flat, coarsely punctate. Penis (Fig. 27b) with sides of body subparallel; apical 1/5 broadly angulate, subglabrous, medially rounded and sparsely setose; transfer apparatus compact, symmetrical; apodemes 2.6 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 1.82–1.88 mm. Female rostrum in apical half dorsally subglabrous, sparsely punctate.
Holotype (MZB): ARC2232 (EMBL # LM655688), East Nusa Tenggara Prov., Flores Isl., Labuhan Bajo, Roe, sample 3, S08°36.259', E120°01.539', 975 m, 13-III-2011. Paratypes (MZB, SMNK, ZSM): Flores Isl., Labuhan Bajo: 1 ex, ARC2217 (EMBL # LM655673), Roe, sample 1, S08°36.540', E120°01.871', 955 m, earthworm-dominated habitat, 13-III-2011; 2 exx, ARC2589 (EMBL # LM655898), ARC3626 (EMBL # LM656056), Roe, sample 3, S08°36.259', E120°01.539', 975 m, 13-III-2011; 1 ex, ARC2226 (EMBL # LM655682), Roe, sample 5, S08°35.395', E120°00.383', 790 m, 13-III-2011; 1 ex, same data as holotype; 3 exx, ARC2244 (EMBL # LM655699), ARC2593 (EMBL # LM655902), ARC2594 (EMBL # LM655903), Tebedo, sample 1, S08°29.848', E119°59.633', 525 m, 14-III-2011.
East Nusa Tenggara Prov., Flores (Labuhan Bajo). Elevation: 525–975 m.
This epithet is based on the Indonesian word for “two” and is treated as a noun in apposition.
Trigonopterus dua Riedel, sp. n. was coded as “Trigonopterus sp. 284”.
- 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