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Holotype, male (Fig. 18a). Length 2.28 mm. Color of antennae and legs ferruginous; remainder dark ferruginous. Body subovate; in dorsal aspect and in profile with weak constriction between pronotum and elytron. Rostrum dorsally with median ridge and pair of submedian ridges; intervening furrows with sparse rows of suberect setae; epistome posteriorly with transverse, angulate ridge. Pronotum with weak subapical constriction; disk coarsely punctate-reticulate; each puncture with suberect, weakly spatulate scale. Elytra with striae deeply impressed, containing rows of punctures each with short, suberect scale; intervals costate, subglabrous; sutural interval raised, with additional row of punctures; apex produced ventrad. Metathoracic spiracle located on laterally projecting denticle. Femora edentate. Metafemur subapically with stridulatory patch. Mesotibia apically confluent with enlarged, curved uncus. Abdominal ventrites 1–2 medially deeply impressed, with dense coarse punctures; ventrite 5 medially with distinct subglabrous depression, laterally coarsely punctate. Penis (Fig. 18b) with sides of body weakly diverging; apex subangulate, sparsely setose; apodemes 1.6 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius with apical part broken and missing. Intraspecific variation. Length 2.22–2.60 mm. Female rostrum slender, dorsally with ridges more rounded; epistome indistinct. Female elytral apex ventrally concave, with sutural interval in profile forming subangulate projection. Female abdominal ventrite 5 with shallow median depression, evenly coarsely punctate.
Holotype (MZB): ARC3075 (GenBank # MK260537), S-Sulawesi Prov., Tanah Toraja, Ponding, Baruppu, 02°48.010'S 119°47.560'E, 2199 m, sifted, 04-V-2013. Paratypes (ARC, MZB, SMNK): S-Sulawesi Prov., Tanah Toraja: 7 exx, ARC3073 (GenBank # MK260536), ARC3074 (GenBank # MK260535), same data as holotype; 6 exx, ARC3068 (EMBL # LN884956), ARC3069 (GenBank # MK260534), Ponding, Baruppu, 02°48.339'S 119°47.880'E, 2113 m, sifted, 04-V-2013; 15 exx, Ponding, Baruppu, 02°49.662'S 119°48.871'E, 2173 m, sifted, 05-V-2013; 23 exx, Ponding, Baruppu, 02°47.918'S 119°47.408'E, 2233 m, sifted, 04-V-2013; 4 exx, Tanah Toraja, Pulu Pulu, 2400 m, sifted, 15–16-VIII-1990.
S-Sulawesi Prov. (Tanah Toraja). Elevation 2100–2400 m.
In leaf litter of montane forest.
This epithet is based on the diminutive form of the Latin adjective costatus, -a, -um (ribbed) and refers to the species´ small size and its elytral sculpture.
Trigonopterus costatulus Riedel, sp. n. was coded as “Trigonopterus sp. 511”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi