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Holotype, male (Fig. 54a). Length 1.49 mm. Color of antennae and legs ferruginous; remainder black. Body subovate; in dorsal aspect with distinct constriction between pronotum and elytron; in profile with weak constriction between pronotum and elytron. Rostrum dorsally punctate-rugose, microreticulate, with median ridge and rows of coarse punctures, each with suberect seta; epistome short, posteriorly with transverse, subangulate ridge. Pronotum with weak subapical constriction; disk densely punctate with coarse punctures; each puncture with single seta. Elytra with striae impressed, containing punctures with short suberect setae; intervals costate, subglabrous. Femora edentate; surface dull, microreticulate. Metafemur subapically with stridulatory patch. Abdominal ventrites 1–2 concave, subglabrous, microreticulate; ventrite 5 flat, coarsely punctate, microreticulate. Penis (Fig. 54b) with sides of body subparallel; apex subtruncate, with few short setae, medially membranous; apodemes 3.3 × as long as body of penis; endophallus with pair of elongate sclerites; transfer apparatus short flagelliform, subequal to body of penis; ductus ejaculatorius with distinct bulbus. Intraspecific variation. Length 1.35–1.59 mm. Female rostrum dorsally subglabrous, punctate; epistome indistinct.
Holotype (MZB): ARC3201 (GenBank # MK260457), S-Sulawesi Prov., Gn. Lompobattang, Malakaji, Parambintolo, 05°23.545'S 119°55.517'E, 1803 m, sifted, 27-IV-2013. Paratypes (MZB, SMNK): 10 exx, ARC3202 (GenBank # MK260459), ARC3203 (GenBank # MK260456), ARC3204 (GenBank # MK260458), same data as holotype.
S-Sulawesi Prov. (Gn. Lompobattang). Elevation ca. 1800 m.
In leaf litter of montane forest.
This epithet is the Latin noun nanus (dwarf) and refers to the small body size of this species.
Trigonopterus nanus Riedel, sp. n. was coded as “Trigonopterus sp. 486”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi