Trigonopterus armipes Riedel

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

8. Trigonopterus armipes Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 8a). Length 2.39 mm. Color of antennae and legs ferruginous; remainder black. Body subovate; in profile dorsally convex, with weak constriction between pronotum and elytron. Rostrum dorsally with median and pair of submedian ridges; intervening furrows with sparse rows of suberect setae; epistome posteriorly with transverse, angulate ridge. Pronotum with weak subapical constriction; densely punctate disk forming broad ridge with impunctate median line; interspaces between punctures subglabrous, subequal to or smaller than punctures´ diameter. Elytra with striae marked by rows of small punctures; basal margin bordered by transverse row of slightly deeper punctures; near humerus striae 7-9 with large, coarse punctures; sutural interval with additional row, other intervals subglabrous, with few interspersed punctures. Femora with anteroventral ridges crenate, ending with acute tooth; anterior surface coarsely punctate, each puncture with subrecumbent yellowish seta. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Abdominal ventrite 1 and anterior portion of ventrite 2 cavernous, subglabrous; ventrite 2 posteriorly forming rim; ventrite 5 broadly concave, sparsely punctate. Penis (Fig. 8b) with sides of body rounded to medially pointed apex; apodemes 2.0 × as long as body of penis; transfer apparatus with complex sclerites; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.13-2.39 mm. Female rostrum dorsally punctate-rugose, with median costa; epistome indistinct. Female abdominal ventrite 5 flat.

Material examined.

Holotype (MZB): ARC2900 (EMBL # LN884944), N-Sulawesi Prov., Kotamobagu, Modoinding, Lake Moat area, 00°42.862'N 124°28.356'E, 1024 m, beaten, 19-V-2012. Paratypes (MZB, SMNK): N-Sulawesi Prov.: 2 exx, ARC2901 (GenBank # MK260296), ARC2902 (GenBank # MK260297), same data as holotype; 7 exx, Kotamobagu, Modoinding, Lake Moat area, 00°42.862'N 124°28.356'E, 1024 m, sifted, 19-V-2012; 5 exx, ARC0333 (PCR failed), ARC0334 (GenBank # MK260299), ARC0335 (GenBank # MK260298), ARC0336 (PCR failed), Gn. Bonde near Matayangan, Bogani Nani Wartabone N.P., 00°27.300'N 123°56.950'E, 908 m, 18-VI-2006.

Distribution.

N-Sulawesi Prov. (Lake Moat, Mt Bonde). Elevation: 910-1020 m.

Biology.

On foliage and in leaf litter in montane forests.

Etymology.

This epithet is a combination of the Latin nouns arma (weapon) and pes (foot, leg). It is treated as a noun in apposition.

Notes.

Trigonopterus armipes Riedel, sp. n. was coded as " Trigonopterus sp. 397". Populations from Lake Moat and Mt Bonde exhibit 10.7-11.1% p-distance in cox1 sequences, but no significant morphological differences could be found.