Trigonopterus scaphiformis Riedel

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

86. Trigonopterus scaphiformis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 86a). Length 2.43 mm. Color of antennae and legs ferruginous; remainder black. Body subovate; in profile dorsally convex. Rostrum dorsally in basal 1/2 with median and pair of submedian costae; intervening furrows with sparse rows of recumbent piliform scales; apical 1/3 subglabrous, sparsely setose. Pronotum with disk densely punctate with small punctures; interspaces between punctures subglabrous. Elytra irregularly punctate with small punctures, along basal margin with transverse row of denser punctures; some striae marked by hardly visible hairlines; intervals flat; stria 8 along humerus with six larger punctures; apex markedly angulate. Legs long. Femora edentate. Meso- and metafemur with anteroventral ridge crenate. Metafemur dorsally with row of recumbent, silvery scales; subapically with stridulatory patch. Metatibia ventrally with row of sparse, thin setae. Abdominal ventrites 1-2 concave, subglabrous; ventrite 5 at middle with ovate subglabrous pit laterally bordered by ridges, subapically with denticle. Penis (Fig. 86b) with sides of body subparallel; apex asymmetrical, with short extension on right side, with sparse setae; apodemes 2.3 × as long as body of penis; transfer apparatus spiniform, directed basad in repose, attached to anchor-shaped supporting sclerite; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.35-2.43 mm. Female rostrum slender, dorsally subglabrous, with two submedian rows of punctures, with pair of sublateral furrows. Female abdominal ventrite 5 flat, medially subglabrous, laterally punctate and sparsely setose.

Material examined.

Holotype (MZB): ARC2997 (GenBank # MK260489), S-Sulawesi Prov., Tanah Toraja, Rantepao, Gn. Karre (= Gn. Wokim), 02°59.021'S 120°02.523'E, 1456 m, beaten, 06-V-2013. Paratypes (MZB, SMNK): 4 exx, ARC3005 (EMBL # LN884949), ARC3006 (GenBank # MK260492), ARC5990 (GenBank # MK260493), same data as holotype; 5 exx, ARC3040 (GenBank # MK260491), ARC3041 (GenBank # MK260490), ARC3042 (GenBank # MK260488), Tanah Toraja, Bittuang, Gn. Ponding, 02°56.446'S 119°38.075'E, 1625 m, beaten, 09-V-2013; 1 ex, Tanah Toraja, Bittuang, Gn. Ponding, 02°56.446'S 119°38.075'E, 1625 m, sifted, 09-V-2013.

Distribution.

S-Sulawesi Prov. (Tanah Toraja). Elevation 1460-1625 m.

Biology.

On foliage in montane forests.

Etymology.

This epithet is a combination of the Latin nouns scapha (boat, skiff), forma (shape) and the 2nd adjectival declension ending -is, and refers to the body shape of this species.

Notes.

Trigonopterus scaphiformis Riedel, sp. n. was coded as " Trigonopterus sp. 497".