Trigonopterus squalidulus Riedel

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

92. Trigonopterus squalidulus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 92a). Length 1.94 mm. Color of antennae and legs ferruginous, remainder dark ferruginous. Body subovate; in dorsal aspect and in profile with distinct constriction between pronotum and elytron. Rostrum dorsally with median and pair of submedian ridges; intervening furrows with rows of coarse punctures and sparse setae; epistome short, posteriorly with transverse, subangulate ridge. Pronotum with weak subapical constriction; disk with transverse, crenulate costae separated by deep furrows; costae with rows of anteriad directed scales. Elytra with striae deeply impressed, with rows of spatulate suberect scales; intervals costate, subglabrous, with sparse punctures; intervals 1, 3, 5, 7 more distinctly swollen, weakly tuberculate. Metathoracic spiracle located on laterally projecting denticle. Femora with anterior surface punctate-rugose. Profemur edentate. Mesofemur and metafemur with small acute tooth; metafemur subapically with stridulatory patch. Mesotibia with enlarged, curved uncus. Abdominal ventrite 1 weakly concave, with coarse punctures; ventrite 5 at middle with shallow depression, coarsely punctate. Penis (Fig. 92b) with sides of body subparallel; apex subangulate, with sparse short setae; apodemes 2.3 × as long as body of penis; endophallus with pair of elongate sclerites; transfer apparatus complex, with asymmetrical S-shaped basal sclerite; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 1.84-2.00 mm. Female rostrum slender, dorsally subglabrous, punctate; epistome indistinct. Female abdominal ventrite 5 flat, basally coarsely punctate.

Material examined.

Holotype (MZB): ARC3071 (GenBank # MK260556), Tanah Toraja, Ponding, Baruppu, 02°48.339'S 119°47.880'E, 2113 m, sifted, 04-V-2013. Paratypes (ARC, MZB, SMNK): 11 exx, ARC3070 (PCR failed), ARC3072 (GenBank # MK260557), same data as holotype; 34 exx, Tanah Toraja, Ponding, Baruppu, 02°48.597'S 119°47.611'E, 1963 m, sifted, 03-V-2013; 1 ex, Tanah Toraja, Ponding - Pulu Pulu, 1800 m, sifted, 13-17-VIII-1990.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation 1800-2100 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is the diminutive form of the Latin adjective squalidus, -a, -um (rough; dirty) and refers to the species´ small size and its rough integument often incrusted with dirt. A variable adjective as well.

Notes.

Trigonopterus squalidulus Riedel, sp. n. was coded as " Trigonopterus sp. 521".