Trigonopterus humilis Riedel

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

28. Trigonopterus humilis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 28a). Length 2.30 mm. Color of antennae and legs ferruginous; remainder black. Body subovate; in dorsal aspect and in profile with distinct constriction between pronotum and elytron. Rostrum at middle with constriction, apical 1/2 slightly widening, spatulate; dorsally with median ridge and pair of submedian ridges; intervening furrows with rows of punctures and sparse setae; epistome short, posteriorly with transverse, subangulate ridge. Pronotum with weak subapical constriction; disk coarsely punctate, interspaces reticulate-scabrous; each puncture with erect piliform scale. Elytra markedly convex; coarsely punctate; interspaces somewhat irregularly tuberculate-costate, subglabrous; punctures each with suberect piliform scale. Metathoracic spiracle located on laterally projecting denticle. Femora edentate; anterior surface dull, weakly punctate-rugose, with sparse piliform scales. Metafemur with anteroventral ridge ending with indistinct blunt tooth; subapically with stridulatory patch. Abdominal ventrite 1 flat, with transverse row of coarse punctures; ventrite 5 with transverse depression, punctate. Penis (Fig. 28b) with sides subparallel, apex subangulate, with sparse setae; in apical 1/3 ventral surface with transverse blade-like process; apodemes 2.5 × as long as body of penis; transfer apparatus complex, symmetrical; ductus ejaculatorius with indistinct bulbus.

Material examined.

Holotype (MZB): ARC3059 (GenBank # MK260558), S-Sulawesi Prov., Tanah Toraja, Bittuang, Gn. Karoa, 02°55.032'S 119°40.365'E, 1992 m, sifted, 10-V-2013.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation ca. 2000 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is the Latin adjective humilis, -e (close to the ground, small) and refers to the species´ small size and edaphic habitat.

Notes.

Trigonopterus humilis Riedel, sp. n. was coded as " Trigonopterus sp. 522".