Trigonopterus toraja Riedel

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

98. Trigonopterus toraja Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 98a). Length 2.55 mm. Color of antennae ferruginous, tarsi and tibiae dark ferruginous; remainder black. Body subovate; in profile dorsally convex. Rostrum in basal 1/2 dorsally with median and pair of submedian costae; intervening furrows with sparse rows of recumbent piliform scales; epistome indistinct; apical 1/3 subglabrous, sparsely setose. Pronotum with disk densely punctate with small punctures; interspaces between punctures subglabrous. Elytra irregularly punctate with small punctures, some striae marked by hardly visible hairlines; intervals flat; humerus with rows of coarser punctures. Meso- and metafemur with anteroventral ridge crenate, ending with blunt denticle in apical 1/3. Metafemur dorsally with recumbent, silvery scales; subapically with stridulatory patch. Metatibia ventrally with sparse row of thin setae. Abdominal ventrites 1-2 concave, subglabrous; in profile ventrite 2 subangularly projecting; ventrite 5 flat, punctate. Penis (Fig. 98b) with sides of body subparallel; apex subtruncate, with sparse setae; apodemes 2.0 × as long as body of penis; transfer apparatus spiniform, directed basad in repose, attached to anchor-shaped supporting sclerite; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.38-2.63 mm. Color of legs from dark ferruginous to almost black. Female rostrum slender, subglabrous, with two submedian rows of punctures, with pair of sublateral furrows.

Material examined.

Holotype (MZB): ARC3054 (GenBank # MK260495), S-Sulawesi Prov., Tanah Toraja, Bittuang, Gn. Karoa, 02°55.270'S 119°40.179'E to 02°55.032'S 119°40.365'E, 1800-2000 m, beaten, 10-V-2013. Paratypes (MZB, SMNK, ZSM): S-Sulawesi Prov., Tanah Toraja, Bittuang: 27 exx, ARC3053 (EMBL # LN884954), ARC5995 (GenBank # MK260494), ARC5996 (EMBL # MK260501), ARC5997 (EMBL # MK260500), ARC5998 (EMBL # MK260498), same data as holotype; 1 ex Tanah Toraja, Bittuang, Gn. Karoa, 02°55.270'S 119°40.179'E, 1836 m, sifted, 10-V-2013; 71 exx, ARC3033 (GenBank # MK260496), ARC3034 (GenBank # MK260497), ARC3035 (GenBank # MK260499), Gn. Ponding, 02°56.446'S 119°38.075'E, 1625 m, beaten, 09-V-2013.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation 1625-1800 m.

Biology.

On foliage in montane forests.

Etymology.

The name “Toraja” resorts both to a people and the land inhabited by them. The epithet is a noun in apposition.

Notes.

Trigonopterus toraja Riedel, sp. n. was coded as " Trigonopterus sp. 498". It is closely related to T. rantepao Riedel, sp. n. from which it can be distinguished by the structure of the penis.