Trigonopterus nitidulus Riedel

Riedel, Alexander & Narakusumo, Raden Pramesa, 2019, One hundred and three new species of Trigonopterus weevils from Sulawesi, ZooKeys 828, pp. 1-153 : 1

55. Trigonopterus nitidulus Riedel sp. n.

Diagnostic description.

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.

Material examined.

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.

Distribution.

N-Sulawesi Prov. (Mt Dua Saudara, Mt Klabat). Elevation 750-920 m.

Biology.

Uncertain if more frequently on foliage or in leaf litter.

Etymology.

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.

Notes.

Trigonopterus nitidulus Riedel, sp. n. was coded as " Trigonopterus sp. 400".