Trigonopterus vicinus Riedel

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

99. Trigonopterus vicinus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 99a). Length 2.78 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 carina and pair of submedian ridges; intervening furrows with rows of yellowish piliform scales; in profile forming rounded hump at junction with forehead; epistome indistinct, subglabrous. Pronotum with disk densely punctate with small punctures; interspaces between punctures subglabrous; median line impunctate. Elytra densely irregularly punctate with small punctures; some striae marked by hardly visible hairlines; intervals flat; stria 8 along humerus with row of six large punctures. Femora edentate. Meso- and metafemur with anteroventral ridge crenate; anterior surface of femora densely punctate, each puncture with narrow recumbent scale. Metafemur dorsally with row of coarse punctures and sparse row of subrecumbent silvery scales; subapically with stridulatory patch. Metatibia with dorsal edge in basal 1/2 weakly crenate, in apical 1/3 narrowed, concave. Abdominal ventrite 1 and anterior portion of ventrite 2 concave, subglabrous; ventrite 5 at middle impressed, concave, sparsely punctate, sublaterally and subapically densely punctate with sparse suberect scales. Penis (Fig. 99b) with sides subparallel; apex subangular, weakly pointed, without setae; apodemes 2.0 × as long as body of penis; transfer apparatus spiniform, directed basad in repose; ductus ejaculatorius with distinct, swollen bulbus. Intraspecific variation. Length 2.48-3.03 mm. Female body more slender. Female rostrum slender, from basal hump bent ventrad, almost straight; dorsally subglabrous, with two submedian rows of punctures, with pair of sublateral furrows. Female abdominal ventrite 5 flat, sparsely punctate.

Material examined.

Holotype (MZB): ARC2845 (GenBank # MK260355), C-Sulawesi Prov., Pendolo, Gn. Sampuraga, 02°12.476'S 120°45.506'E, 1050 m, beaten, 31-V-2012. Paratypes (ARC, MZB, SMNK, ZSM): C-Sulawesi Prov.: 70 exx, ARC2843 (GenBank # MK260361), ARC2844 (GenBank # MK260360), ARC2846 (GenBank # MK260356), same data as holotype; 6 exx, Pendolo, Gn. Sampuraga, 02°12.165'S 120°45.567'E to 02°12.308'S 120°45.544'E, 934-1011 m, beaten, 13-V-2013; 39 exx, ARC2870 (GenBank # MK260357), ARC2871 (GenBank # MK260358), ARC2872 (GenBank # MK260359), Tentena, Tonusu, Bada-road, 01°47.316'S 120°30.623'E, 1078 m, beaten, 01-VI-2012; 5 exx, Tentena, Tonusu, Bada-road, 800-1000 m, beaten, 01-IX-1997; 10 exx, ARC3103 (GenBank # MK260354), ARC3104 (GenBank # MK260362), Pendolo, Boe, 02°05.405'S 120°38.551'E to 02°05.446'S 120°38.519'E, 750-950 m, beaten, 15-V-2013.

Distribution.

C-Sulawesi Prov. (Lake Poso). Elevation 950-1080 m.

Biology.

On foliage in montane forests.

Etymology.

This epithet is the Latin adjective vicinus, -a, -um (neighboring, similar) and refers to its sibling species found in close geographical distance.

Notes.

Trigonopterus vicinus Riedel, sp. n. was coded as " Trigonopterus sp. 412". It is closely related to T. ejaculatorius Riedel, sp. n. from which it differs by 17.3% p-distance of cox1 and can be distinguished by the less marked basal hump of the rostral profile.