Trigonopterus crenulatus Riedel

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

20. Trigonopterus crenulatus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 20a). Length 2.30 mm. Color of antennae and legs ferruginous, remainder dark ferruginous. Body subovate; in profile with distinct constriction between pronotum and elytron. Rostrum dorsally with median and pair of submedian ridges; intervening furrows with rows of punctures and sparse setae; epistome short, posteriorly with transverse, subangulate ridge extended into median denticle. Pronotum with very weak subapical constriction; disk with transverse, crenulate costae separated by deep furrows; costae with rows of anteriad directed setae. Elytra with striae deeply impressed, with dense rows of punctures; punctures each with narrow, suberect scale; intervals costate, subglabrous. Metathoracic spiracle located on laterally projecting denticle. Femora with anterior surface punctate-rugose. Profemur edentate. Mesofemur and metafemur with small tooth; metafemur subapically with stridulatory patch. Abdominal ventrite 1 concave, microreticulate, with coarse punctures; ventrite 5 at middle with distinct depression, coarsely punctate. Penis (Fig. 20b) with sides of body subparallel; apex subtruncate, with sparse short setae; basal orifice with transverse brace; apodemes 2.8 × as long as body of penis; endophallus with pair of elongate sclerites; transfer apparatus flagelliform, 2.0 × longer than body; ductus ejaculatorius with distinct bulbus. Intraspecific variation. Length 2.05-2.30 mm. Female rostrum dorsally subglabrous, punctate; epistome indistinct. Female abdominal ventrite 5 flat, coarsely punctate.

Material examined.

Holotype (MZB): ARC3009 (GenBank # MK260552), S-Sulawesi Prov., Rantepao, Gn. Karre (= Gn. Wokim), 02°59.021'S 120°02.523'E, 1456 m, sifted, 06-V-2013. Paratypes (MZB, SMNK): 69 exx, ARC3010 (GenBank # MK260555), ARC3011 (GenBank # MK260554), ARC3012 (GenBank # MK260553), same data as holotype.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation ca. 1460 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is the Latin adjective crenulatus, -a, -um (with small notches, rounded projections) and refers to the sculpture of the pronotum.

Notes.

Trigonopterus crenulatus Riedel, sp. n. was coded as " Trigonopterus sp. 520".