Trigonopterus suturatus Riedel

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

94. Trigonopterus suturatus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 94a). Length 2.58 mm. Color of antennae light ferruginous; legs dark ferruginous; head and elytra dark ferruginous to black; remainder black. Body elongate; in dorsal aspect with constriction between pronotum and elytron; in profile dorsally flat. Rostrum dorsally with median carina and pair of distinct submedian ridges; intervening furrows with sparse, piliform scales; epistome indistinct. Pronotum elongate; disk densely punctate with coarse punctures, reticulate interspaces glabrous; with median costa, in basal 1/2 bordered by shallow submedian depressions; with sparse yellowish scales, anteriorly piliform and erect, sublaterally broader and recumbent. Elytra with striae 1-4 deeply entrenched, laterally with partly irregular punctures; dorsally intervals costate; sutural interval anteriorly markedly swollen, forming transverse costa to humeri; dorsally with sparse, almond-shaped, yellow, recumbent scales. Femora dentate, with acute tooth; anterior surface subglabrous, sparsely punctate, with few scattered recumbent piliform scales. Metafemur dorsally with sparse, almond-shaped, yellow scales; subapically with stridulatory patch. Tibia with dorsal edge subbasally denticulate. Abdominal ventrites 1-2 subglabrous, laterally with sparse coarse punctures; ventrite 5 flat, subglabrous, laterally with sparse coarse punctures. Penis (Fig. 94b) with sides of body subparallel, apex rounded, without setae; apodemes 2.6 × as long as body of penis; transfer apparatus flagelliform, 2.3 × longer than body of penis; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.58-2.80 mm. Female rostrum slender.

Material examined.

Holotype (MZB): ARC3211 (EMBL # LN884976), S-Sulawesi Prov., Mangkutana, 02°20.306'S 120°46.792'E, 909 m, sifted, 14-V-2013. Paratypes (MZB, SMNK): S-Sulawesi Prov.: 2 exx, ARC3212 (GenBank # MK260462), ARC3232 (GenBank # MK260463), same data as holotype; 1 ex, ARC3141 (GenBank # MK260461), Pendolo, Boe, 02°05.446'S 120°38.519'E, 915 m, 15-V-2013.

Distribution.

S-Sulawesi Prov. (Mangkutana), C-Sulawesi Prov. (Pendolo). Elevation ca. 910-915 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is a Latinized adjective based on the Latin noun sutura (seam) and suffix -atus (pertaining to) and refers to the swollen sutural interval of the elytra.

Notes.

Trigonopterus suturatus Riedel, sp. n. was coded as " Trigonopterus sp. 488".