Trigonopterus mahawuensis Riedel

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

46. Trigonopterus mahawuensis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 46a). Length 2.58 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 median costa and pair of submedian ridges; intervening furrows each with row of subrecumbent setae. Pronotum with disk densely punctate; interspaces between punctures subglabrous, subequal to or smaller than punctures´ diameter. Elytra with striae marked by fine lines and rows of small punctures; basal margin bordered by transverse row of deeper punctures; stria 8 along humerus with six larger punctures, externally bordered by costa; sutural interval with additional row of small punctures, other intervals subglabrous, with few interspersed punctures. Femora edentate; anteroventral ridge of mesofemur and metafemur crenate; anterior surface coarsely punctate, each puncture with recumbent narrow scale. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Metatibia subapically near tarsal articulation with dense cluster of strongly incurved setae. Abdominal ventrites 1-2 concave, subglabrous; ventrite 5 with apical 1/2 bent ventrad; sparsely punctate. Penis (Fig. 46b) with sides of body concave, widening to apex; with ostium protruding over ventral rim of penis, without setae; apodemes 2.2 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.20-2.63 mm. Female rostrum with low, widened median costa; separated from submedian costae by row of punctures. Female abdominal ventrite 5 flat, subapically with sparse recumbent scales.

Material examined.

Holotype (MZB): ARC2763 (GenBank # MK260279), N-Sulawesi Prov., Tomohon, Rurukan, Gn. Mahawu, 01°20.844'N 124°52.253'E to 01°20.751'N 124°52.129'E, 1209-1305 m, beaten, 15-V-2012. Paratypes (MZB, SMNK): N-Sulawesi Prov.: 81 exx, ARC2764 (GenBank # MK260282), same data as holotype; 35 exx, ARC2750 (GenBank # MK260280), ARC2751 (GenBank # MK260281), Tomohon, Rurukan, Gn. Mahawu, 01°21.409'N 124°51.535'E to 01°21.370'N 124°51.676'E, 1126-1231 m, beaten, 14-V-2012; 27 exx, Tomohon, Rurukan, Gn. Mahawu, 01°20.951'N 124°52.207'E, 1230 m, beaten, 14-V-2012; 5 exx, Gn. Mahawu, Tomohon, 01°20.951'N 124°52.207'E, 1230 m, 14-V-2012, sifted; 1 ex, Gn. Mahawu, Tomohon, 01°20.819'N 124°52.194'E,1278 m, sifted, 15-V-2012; 26 exx, Tomohon, Rurukan, Gn. Mahawu, 1150-1200 m, beaten, 30-XI-1999; 10 exx, Tomohon, Rurukan, Gn. Mahawu, 1150-1200 m, beaten, 30-XI-1999 / 03-XII-1999; 11 exx, Gn. Soputan, Kawangkoan, Tombasi, 1200-1400 m, beaten, 02-XII-1999.

Distribution.

N-Sulawesi Prov. (Tomohon, Mt Soputan). Elevation 1200-1280 m.

Biology.

On foliage in montane forests.

Etymology.

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

Notes.

Trigonopterus mahawuensis Riedel, sp. n. was coded as " Trigonopterus sp. 394".