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Holotype, male (Fig. 55a). Length 2.50 mm. Color of antennae, tibiae, and tarsi ferruginous; remainder black. Body subovate; in profile dorsally convex. Rostrum dorsally with median and pair of submedian ridges; behind epistome scabrous; with sparse rows of erect, subclavate scales; epistome posteriorly with transverse, angulate ridge. Pronotum with disk densely punctate; dorsally punctures small; interspaces between punctures subglabrous; laterally punctures coarse. Elytra with striae marked by small punctures and weakly impressed lines, subapically more deeply entrenched; stria 8 along humerus with large, coarse punctures; intervals subglabrous; subapically profile of ventral margin crenate. Femora edentate; anterior surface coarsely punctate, each puncture with recumbent scale. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Abdominal ventrites 1–2 concave, subglabrous; ventrite 5 flat, microgranulate, dull. Penis (Fig. 55b) with sides of body subparallel, converging to subtriangular apex; subapically with sparse setae; dorsally with patches of setae pointing to midline; apodemes 1.4 × as long as body of penis; transfer apparatus flagelliform, ca. 1.2 × longer than body; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.33–2.58 mm. Female rostrum with dorsal ridges only at base, anteriorly subglabrous, with submedian rows of punctures and sublateral furrows; epistome simple. Female abdominal ventrite 5 sparsely punctate, sublaterally with sparse erect scales.
Holotype (MZB): ARC2797 (GenBank # MK260301), N-Sulawesi Prov., Airmadidi, Gn. Klabat, 01°26.368'N 125°00.609'E to 01°26.505'N 125°00.636'E, 872–923 m, beaten, 16-V-2012. Paratypes (MZB, SMNK): N-Sulawesi Prov.: 1 ex, ARC2798 (GenBank # MK260302), same data as holotype; 1 ex, Airmadidi, Gn. Klabat, 01°26.430'N 125°00.622'E, 889 m, sifted, 17-V-2012; 1 ex, Airmadidi, Gn. Klabat, 01°26.505'N 125°00.636'E, 923 m, sifted, 16-V-2012; 1 ex, Airmadidi, Gn. Klabat, 01°26.368'N 125°00.609'E to 01°26.505'N 125°00.636'E, 872–923 m, 16-V-2012, beaten; 4 exx, Airmadidi, Gn. Klabat, 01°26.505'N 125°00.636'E to 01°26.635'N 125°00.823'E, 923–1031 m, 16-V-2012, beaten; 1 ex, ARC0349 (GenBank # HG939578), Bitung, Gn. Dua Saudara, 750 m, 24-VI-2006, sifted.
N-Sulawesi Prov. (Mt Dua Saudara, Mt Klabat). Elevation 750–920 m.
Uncertain if more frequently on foliage or in leaf litter.
This epithet is the diminutive form of the Latin adjective nitidus, -a, -um (polished) and refers to the species´ small size and its elytral sculpture.
Trigonopterus nitidulus Riedel, sp. n. was coded as “Trigonopterus sp. 400”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi