Trigonopterus pumilus Riedel

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

74. Trigonopterus pumilus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 74a). Length 1.67 mm. Color of antennae and legs ferruginous; remainder dark ferruginous to black. Body subovate; in dorsal aspect and in profile with weak constriction between pronotum and elytron. Rostrum dorsally with median ridge and pair of sublateral somewhat irregular ridges; intervening furrows with coarse punctures containing each one indistinct seta; epistome short, subglabrous. Pronotum with disk densely, coarsely punctate; interspaces between punctures reticulate-rugose. Elytra with striae deeply impressed, intervals dorsally tuberculate-costate, subglabrous; punctures each with short, suberect piliform scale. Legs long. Femora edentate. Anteroventral ridges indistinct; anterior surface of femora coriaceous, punctate. Metafemur subapically with stridulatory patch. Abdominal ventrite 1 weakly concave, microreticulate, with coarse punctures; ventrite 5 basally and laterally with coarse punctures, at middle with subglabrous depression. Penis (Fig. 74b) with sides subparallel in basal 1/2; apex forming long, spiniform, markedly downwardly curved extension, laterally with sparse setae; basal orifice with well-sclerotized ventral plate; apodemes 2.3 × as long as body of penis; transfer apparatus and ductus ejaculatorius lost. Intraspecific variation. Length 1.67-1.80 mm. Female rostrum dorsally with rows of coarse punctures, medially with indistinct subglabrous costa; without epistome. Female abdominal ventrite 5 flat, coarsely punctate.

Material examined.

Holotype (MZB): ARC3063 (GenBank # MK260547), S-Sulawesi Prov., Tanah Toraja, Bittuang, Gn. Karoa, 02°55.270'S 119°40.179'E, 1836 m, sifted, 10-V-2013. Paratypes (MZB, SMNK): 3 exx, ARC3064 (GenBank # MK260548), same data as holotype.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation ca. 1840 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is based on the Latin noun pumilus (dwarf) and refers to the species´ small body size.

Notes.

Trigonopterus pumilus Riedel, sp. n. was coded as " Trigonopterus sp. 518".