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Holotype, male (Fig. 101a). Length 2.34 mm. Color of antennae and legs ferruginous; remainder black. Body subovate; in dorsal aspect with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum dorsally with median and pair of submedian ridges; intervening furrows with sparse rows of subrecumbent setae; epistome short, weakly swollen. Pronotum with disk densely punctate with coarse punctures except along impunctate median line; interspaces between punctures subglabrous, subequal to or smaller than punctures´ diameter; in subbasal 1/4 punctation sparse. Elytra with striae marked by small punctures; basal margin bordered by transverse row of deeper punctures; stria 8 along humerus with row of seven large punctures; sutural interval subbasally swollen, with shortened row of small punctures; intervals subglabrous. Femora edentate. Metafemur with dorsoposterior edge denticulate; subapically with stridulatory patch. Abdominal ventrite 1 cavernous, at middle subglabrous, lateral rims with sparse erect scales; ventrite 2 costate; ventrite 5 subglabrous, punctate, with shallow impression. Penis (Fig. 101b) with sides of body subparallel; apex weakly rounded, without setae; apodemes 2.2 × as long as body of penis; transfer apparatus complex; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.20–2.34 mm. Female rostrum slender, in basal 1/4 with median and pair of submedian ridges; anteriorly subglabrous with submedian row of punctures and sublateral pair of furrows; epistome simple.
Holotype (MZB): ARC2800 (GenBank # MK260273), N-Sulawesi Prov., Airmadidi, Gn. Klabat, 01°26.988'N 125°01.244'E, 1392 m, sifted, 17-V-2012. Paratypes (MZB, SMNK): N-Sulawesi Prov.: 1 ex, ARC2801 (GenBank # MK260274), same data as holotype; 1 ex, ARC2792 (GenBank # MK260272), Airmadidi, Gn. Klabat, 01°26.635'N 125°00.823'E, 1031 m, sifted, 16-V-2012; 1 ex, Airmadidi, Gn. Klabat, 01°26.754'N 125°01.014'E, 1145 m, sifted, 16-V-2012; 5 exx, Airmadidi, Gn. Klabat, 01°26.430'N 125°00.622'E, 889 m, sifted, 17-V-2012; 1 ex, ARC2757 (GenBank # MK260271), Tomohon, Rurukan, Gn. Mahawu, 01°21.409'N 124°51.535'E to 01°21.370'N 124°51.676'E, 1126–1231 m, 14-V-2012.
N-Sulawesi Prov. (Mt Klabat, Tomohon). Elevation 890–1400 m.
In leaf litter of montane forest.
This epithet is a noun in genitive plural. It refers to the species´ occurrence on two active volcanoes.
Trigonopterus volcanorum Riedel, sp. n. was coded as “Trigonopterus sp. 392”.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi