Trigonopterus abnormis Riedel

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

1. Trigonopterus abnormis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 1a). Length 3.00 mm. Color of antennae and legs ferruginous; remainder black. Body shape dominated by laterally protruding humeri; in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally convex. Rostrum in basal 1/2 dorsally with median ridge and pair of submedian ridges; anteriorly coarsely punctate; furrows with rows of erect subclavate scales; epistome with transverse ridge and submedian pair of denticles. Pronotum anteriorly with lateral flanges; disk subquadrate, coarsely punctate; interspaces subglabrous. Elytra with humeri markedly protruding; densely irregularly punctate with small punctures, near base punctures larger; striae indistinct, some marked by hairlines; sutural interval in basal 1/3 swollen, densely irregularly punctate; swollen humeri densely coarsely punctate; subbasally with yellowish almond-shaped scales; subapically with sparse narrow scales. Femora with anteroventral ridge distinct, crenate, in meso- and metafemur ending with denticle; anterior surface punctate-reticulate, each puncture with a scale, dorsally scales erect and subclavate. Metafemur with dorsoposterior edge serrate; subapically with stridulatory patch. Metatibia with posterior surface densely setose in subapical 1/2, with erect scales in basal 1/2. Abdominal ventrites 1-2 concave, subglabrous. Abdominal ventrite 5 flat, densely coarsely punctate. Penis (Fig. 1b) with body differentiated into hyaline lateral flanges and sclerotized inner frame; sides of body weakly diverging; apex with median constriction; apodemes 3.1 × as long as body of penis; transfer apparatus complex, asymmetrical; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 2.20-3.00 mm. Female rostrum dorsally flattened, with ridges less distinct; epistome indistinct. Female pronotum without lateral flanges. Female elytra without swollen humeri.

Material examined.

Holotype (MZB): ARC3142 (EMBL # LN884964), SE-Sulawesi Prov., Kendari, road from Wawotobi to Lasolo, 03°44.142'S 122°13.670'E, 482 m, sifted, 17-IV-2013. Paratypes (SMNK, MZB): 5 exx, ARC3143 (GenBank # MK260434), ARC3144 (GenBank # MK260436), ARC3145 (GenBank # MK260435), same data as holotype.

Distribution.

SE-Sulawesi Prov. (Kendari). Elevation ca. 480 m.

Biology.

In leaf litter of lowland forest.

Etymology.

This epithet is based on the Latin adjective abnormis, -e (abnormal) and refers to the species´ unusual body shape.

Notes.

Trigonopterus abnormis sp. n. was coded as " Trigonopterus sp. 481".