Trigonopterus hirsutus Riedel

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

27. Trigonopterus hirsutus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 27a). Length 1.56 mm. Color ferruginous, tarsi and antennal club darker. Body subovate; in dorsal aspect with distinct constriction between pronotum and elytron; in profile dorsally flat, convex to apex. 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 densely punctate with coarse punctures; each puncture with spatulate, anteriad directed, yellowish scale. Elytra with striae impressed, marked by rows of coarse punctures; punctures each with spatulate, yellowish scale; intervals costate, subglabrous. Metathoracic spiracle located on laterally projecting denticle. Femora edentate; surface dull, microreticulate. Metafemur subapically with stridulatory patch. Abdominal ventrites 1-2 concave, microreticulate, punctate; ventrite 5 flat, coarsely densely punctate, dull. Penis (Fig. 27b) with sides of body subparallel; apex subtruncate, with few short setae, medially membranous; apodemes 2.4 × 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 1.40-1.63 mm. Female rostrum dorsally subglabrous, punctate; epistome indistinct. Female abdominal ventrite 5 flat, coarsely punctate.

Material examined.

Holotype (MZB): ARC3060 (GenBank # MK260447), S-Sulawesi Prov., Tanah Toraja, Bittuang, Gn. Karoa, 02°55.032'S 119°40.365'E, 1992 m, sifted, 10-V-2013. Paratypes (ARC, MZB, SMNK): S-Sulawesi, Tanah Toraja: 2 exx, ARC3061 (GenBank # MK260446), ARC3062 (GenBank # MK260448), same data as holotype; 10 exx, ARC3076 (GenBank # MK260450), ARC3077 (GenBank # MK260451), Ponding, Baruppu, 02°48.010'S 119°47.560'E, 2199 m, sifted, 04-V-2013; 6 exx, Tanah Toraja, Ponding, Baruppu, 02°48.597'S 119°47.611'E, 1963 m, sifted, 03-V-2013; 42 exx, ARC3081 (GenBank # MK260452), ARC3082 (GenBank # MK260453), ARC3083 (GenBank # MK260454), ARC3084 (GenBank # MK260455), Ponding, Baruppu, 02°49.748'S 119°48.995'E, 2139 m, 05-V-2013; 7 exx, Tanah Toraja, Ponding, Baruppu, 02°48.339'S 119°47.880'E, 2113 m, sifted, 04-V-2013; 11 exx, Ponding, Baruppu, 02°49.662'S 119°48.871'E, 2173 m, sifted, 05-V-2013; 24 exx, Ponding, Baruppu, 02°47.918'S 119°47.408'E, 2233 m, sifted, 04-V-2013; 13 exx, Tanah Toraja, Pulu Pulu, 2400 m, sifted, 15-16-VIII-1990; 8 exx, Tanah Toraja, Pulu Pulu, 2400 m, sifted, 13-16-VIII-1990; 1 ex, ARC3018 (GenBank # MK260449), Rantepao, Gn. Karre (= Gn. Wokim), 02°59.021'S 120°02.523'E, 1456 m, sifted, 06-V-2013.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation 1460-2400 m.

Biology.

In leaf litter of montane forest.

Etymology.

This epithet is the Latin adjective hirsutus, -a, -um (rough, bristly) and refers to the species´ elytral vestiture.

Notes.

Trigonopterus hirsutus Riedel, sp. n. was coded as " Trigonopterus sp. 485". Most of the specimens examined are females (2 males / 74 females); the reason for this unequal proportion is unknown.