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Holotype, male (Fig. 23a). Length 2.75 mm. Color of antennae ferruginous; legs dark ferruginous; remainder black. Body subovate; in dorsal aspect with distinct constriction between pronotum and elytron, in profile dorsally convex. Rostrum dorsally with median costa and pair of submedian ridges; intervening furrows with rows of silvery elongate scales; in profile median costa forming subangular hump at junction with forehead; epistome indistinct. Pronotum with disk densely punctate; interspaces between punctures subglabrous; median line impunctate. Elytra densely irregularly punctate with small punctures; striae marked by hardly visible hairlines; intervals flat; stria 7 and 8 along humerus with 5–6 coarse punctures. Femora edentate. Meso- and metafemur with anteroventral ridge crenate; anterior surface of femora densely punctate, each puncture with narrow recumbent scale. Metafemur with dorsoposterior edge weakly crenate; subapically with stridulatory patch. Metatibia with dorsal edge in basal 1/2 denticulate. Abdominal ventrites 1–2 weakly concave, subglabrous, laterally microreticulate, with sparse erect scales; ventrite 5 at middle impressed, concave, subglabrous, sublaterally and subapically densely punctate. Penis (Fig. 23b) with sides subparallel; apex subangulate, weakly pointed, without setae; apodemes 2.0 × as long as body of penis; transfer apparatus spiniform, directed basad in repose; ductus ejaculatorius with distinct, swollen bulbus.
S-Sulawesi Prov. (Mangkutana). Elevation ca. 850–910 m.
On foliage in montane forests.
This epithet is based on the ductus ejaculatorius which is markedly swollen in males of this species. It is treated as an adjective.
Trigonopterus ejaculatorius Riedel, sp. n. was coded as “Trigonopterus sp. 507”. It is closely related to Trigonopterus vicinus Riedel, sp. n. from which it differs by 17.3% p-distance of cox1 and can be distinguished by the subangular basal hump of the rostral profile.
- Riedel, A; Narakusumo, R; 2019: One hundred and three new species of Trigonopterus weevils from Sulawesi ZooKeys, (828): 1-153. doi