Trigonopterus ambangensis Riedel

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

4. Trigonopterus ambangensis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 4a). Length 2.60 mm. Color of antennae and tarsi ferruginous; remainder black. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with broad median costa and pair of submedian ridges; intervening furrows each with row of subrecumbent scales. Pronotum with disk densely punctate with coarse punctures; interspaces between punctures subglabrous, smaller than punctures´ diameter. Elytra with striae marked by distinct rows of small punctures; basal margin bordered by transverse row of deeper punctures joining stria 8; sutural interval with additional row, other intervals subglabrous, with few interspersed punctures. Femora edentate; anterior surface coarsely punctate, each puncture with recumbent white narrow scale. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Metatibia subapically with dense cluster of setae. Abdominal ventrites 1-2 concave, subglabrous, laterally with suberect scales; ventrite 5 at middle with deep depression, subapically densely punctate and laterally with few erect scales. Penis (Fig. 4b) with sides of body weakly subparallel, in apical 1/3 with lateral swelling; apex subtruncate, with median extension and sparse setae; apodemes 1.5 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.40-2.76 mm. Female rostrum with low, widened median costa; separated from submedian costae by row of punctures. Female abdominal ventrite 5 flat, evenly punctate, with sparse scales.

Material examined.

Holotype (MZB): ARC5250 (GenBank # MK260278), N-Sulawesi Prov., NE of Kotamobagu, Modoinding, Gn. Ambang, east slope, 00°45.71'N 124°25.41'E, 1500 m, hand-collected, 25-XI-2012. Paratypes (ARC, MZB, SMNK): N-Sulawesi Prov., NE of Kotamobagu, Modoinding, Gn. Ambang: 1 ex, ARC0341 (EMBL # HG939577), 00°45.533'N 123°25.383'E, 1480 m, 20-VI-2006; 1 ex, ARC5240 (GenBank # MK260276), 00°46.86'N 124°29.42'E, 1480 m, 28-XII-2012; 2 exx, ARC5251 (GenBank # MK260275), ARC5252 (GenBank # MK260277), same data as holotype; 1 ex, 1450 m, sifted, 06-XII-1999; 6 exx, 1200-1450 m, beaten, 12-XII-1999.

Distribution.

N-Sulawesi Prov. (Mt Ambang). Elevation 1480-1500 m.

Biology.

On foliage in montane forests.

Etymology.

This epithet is a Latinized adjective based on the type locality Mt Ambang.

Notes.

Trigonopterus ambangensis Riedel, sp. n. was coded as " Trigonopterus sp. 393".