Trigonopterus darwini Riedel

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

22. Trigonopterus darwini Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 22a). Length 1.90 mm. Color of antennae yellowish; tarsi ferruginous; remainder black. Body subovate; in dorsal aspect with weak constriction, in profile with marked constriction between pronotum and elytron. Rostrum dorsally with median costa and pair of submedian ridges; intervening furrows with rows of punctures containing each one indistinct seta; epistome simple, subglabrous. Pronotum with disk dorsally swollen, densely punctate; interspaces between punctures subglabrous. Elytra with striae marked by dense rows of deep punctures; sutural interval with row of small punctures, other intervals subglabrous, weakly costate; basal margin bordered by transverse row of punctures. Profemur with anteroventral ridge simple; meso- and metafemur with minute denticle in apical 1/2; anterior surface of femora punctate, wrinkled, microreticulate. Metafemur subapically with stridulatory patch. Abdominal ventrite 1 microreticulate, concave, with coarse punctures; ventrite 5 microreticulate, with shallow concavity, sparsely punctate. Penis (Fig. 22b) with sides converging; apex rounded, sublaterally with sparse fringe of setae; apodemes 1.4 × as long as body of penis; transfer apparatus dentiform, directed basad in repose; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 1.90-2.28 mm. Female rostrum more slender; dorsally in apical 1/2 subglabrous, with lateral and sublateral rows of punctures. Female abdominal ventrite 5 microreticulate, sparsely punctate, with sparse suberect setae.

Material examined.

Holotype (MZB): ARC2860 (GenBank # MK260334), C-Sulawesi Prov., Pendolo, Gn. Sampuraga, 02°12.476'S 120°45.506'E, 1050 m, sifted, 31-V-2012. Paratypes (MZB, SMNK): C-Sulawesi Prov.: 4 exx, ARC2861 (GenBank # MK260335), ARC6067 (GenBank # MK260337), ARC6068 (GenBank # MK260336), same data as holotype; 1 ex, ARC3210 (GenBank # MK260333), Pendolo, Gn. Sampuraga, 02°12.308'S 120°45.544'E, 1011 m, sifted, 13-V-2013.

Distribution.

C-Sulawesi Prov. (Pendolo). Elevation 1010-1050 m.

Biology.

In leaf litter of montane forest.

Etymology.

This species is named in honor of Charles Darwin for providing an evolutionary foundation to the science of taxonomy. An invariable genitive.

Notes.

Trigonopterus darwini Riedel, sp. n. was coded as " Trigonopterus sp. 407".