Trigonopterus posoensis Riedel

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

64. Trigonopterus posoensis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 64a). Length 2.60 mm. Color of antennae ferruginous; legs dark ferruginous; remainder black. Body subovate; in dorsal aspect with moderate constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median and pair of submedian ridges; intervening furrows each with sparse row of erect scales; epistome scabrous, with median ridge. Pronotum with disk densely punctate with coarse, almost confluent punctures; each puncture containing single, minute seta; narrow interspaces subglabrous; medially with indistinct costa. Elytra densely irregularly punctate with small punctures; striae indistinct; interspaces between punctures subglabrous; striae 7-9 with larger punctures; stria 8 along humerus with seven large, coarse punctures. Femora edentate; anterior surface densely coarsely punctate, each puncture with suberect scale. Metafemur with dorsoposterior edge simple; subapically with stridulatory patch. Abdominal ventrites 1-2 concave, subglabrous, with sparse coarse punctures; in profile ventrite 2 rounded; ventrite 5 at middle with shallow impression, densely coarsely punctate, sublaterally with sparse erect scales. Penis (Fig. 64b) with sides of body diverging; apex bent ventrad, subangulate, with short subacute median extension, with sparse setae; apodemes 2.8 × as long as body; transfer apparatus complex, with basal sclerites and flagelliform part, subequal to body of penis; ductus ejaculatorius with distinct bulbus. Intraspecific variation. Length 2.60-2.78 mm. Female rostrum slender, dorsally with median and pair of submedian glabrous costae; epistome simple, punctate-rugose. Female abdominal ventrites 1-2 almost flat.

Material examined.

Holotype (MZB): ARC2873 (EMBL # LN884941), C-Sulawesi Prov., Tentena, Taripa, 01°51.589'S 120°48.353'E to 01°50.886'S 120°48.336'E, 680-770 m, beaten, 02-VI-2012. Paratypes (ARC, MZB, SMNK, ZSM): C-Sulawesi Prov., Lake Poso area: 4 exx, ARC2874 (GenBank # MK260213), ARC2875 (GenBank # MK260214), same data as holotype; 2 exx, Tentena, Taripa, 01°49.858'S 120°47.108'E to 01°50.040'S 120°46.666'E, 896-911 m, beaten, 02-VI-2012; 11 exx, ARC3121 (GenBank # MK260204), ARC3122 (GenBank # MK260215), Pendolo, Gn. Sampuraga, 02°14.099'S 120°46.631'E, 1245 m, beaten, 13-V-2013; 1 ex, Pendolo, Gn. Sampuraga, 02°14.099'S 120°46.631'E, 1245 m, sifted, 13-V-2013; 239 exx, ARC3107 (GenBank # MK260209), ARC3108 (GenBank # MK260212), ARC3109 (GenBank # MK260207), ARC3119 (GenBank # MK260206), ARC3120 (GenBank # MK260205), ARC5984 (GenBank # MK260208), ARC5985 (GenBank # MK260210), ARC5986 (GenBank # MK260211), Pendolo, Boe, 02°05.405'S 120°38.551'E to 02°05.446'S 120°38.519'E, 750-950 m, 15-V-2013, beaten; 11 exx, Pendolo, Boe, 02°05.440'S 120°38.537'E, 901 m, sifted, 15-V-2013; 4 exx, Pendolo, Boe, 02°05.446'S 120°38.519'E, 915 m, sifted, 15-V-2013; 10 exx, Pendolo, Boe, 02°05.405'S 120°38.551'E, 857 m, 15-V-2013, beaten; 37 exx, Pendolo, Boe, 21-VIII-1990; 1 ex, Pendolo, 15 km -> Mangkutana, 22-VIII-1990.

Biology.

On foliage in lower montane forests.

Distribution.

C-Sulawesi Prov. (Pendolo, Tentena). Elevation 680-1245 m.

Etymology.

This epithet is a Latinized adjective that refers to Lake Poso which is close to the type locality.

Notes.

Trigonopterus posoensis Riedel, sp. n. was coded as " Trigonopterus sp. 377". This species is very closely related to T. obelix Riedel, sp. n., from which it differs by ca. 15.0-15.5% p-distance of cox1, and by the subangularly projecting profile of abdominal ventrite 2.