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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.
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.
S-Sulawesi Prov. (Tanah Toraja). Elevation ca. 1840 m.
In leaf litter of montane forest.
This epithet is based on the Latin noun pumilus (dwarf) and refers to the species´ small body size.
Trigonopterus pumilus Riedel, sp. n. was coded as “Trigonopterus sp. 518”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi