Trigonopterus laratensis Narakusumo & Riedel

Narakusumo, Raden Pramesa, Balke, Michael & Riedel, Alexander, 2019, Seven new species of Trigonopterus Fauvel (Coleoptera, Curculionidae) from the Tanimbar Archipelago, ZooKeys 888, pp. 75-93 : 75

Trigonopterus laratensis Narakusumo & Riedel sp. nov.

Diagnostic description.

Holotype: Male ( Fig. 3a ). Length 2.53 mm. Color of head, femora and tibiae ferruginous; remainder black. Body subovate; in dorsal aspect almost without constriction between pronotum and elytron; profile dorsally convex. Rostrum in basal 1/2 with median costa and submedian ridges, intervening furrows with sparse, suberect scales. Pronotum subglabrous, sparsely punctate with small to minute punctures; anterolaterally with coarse punctures. Elytra subglabrous, punctate with minute punctures; striae marked by faint hairlines. Femora subglabrous weakly microreticulate, with minute punctures; with anteroventral ridge distinct, simple. Meso- and metafemur dorsally squamose with white scales. Mesotibia basally rounded; subapically with uncus and larger premucro. Metafemur subapically simple, without stridulatory patch; with uncus, without premucro. Abdominal ventrites 1-2 medially concave, subglabrous, microreticulate; ventrite 2 posteriorly projecting and forming edge; ventrite 5 almost flat, weakly concave, microreticulate. Penis ( Fig. 3b ) with side subparallel; apex symmetrical, with median triangular extension; transfer apparatus dentiform, apically bordered by pair of L-shaped sclerites; apodemes 3.0 × as long as body of penis; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.48-2.53 mm. Female rostrum dorsally subglabrous, punctate; in basal 1/3 with median and submedian ridges. Female mesotibia subapically with uncus and minute premucro. Female abdominal ventrites 1-2 flat, with sparse punctures; ventrite 5 flat, subglabrous.

Material examined.

Holotype (MZB): MZB0022 (GenBank # MN322587), Indonesia, Maluku, Tanimbar, Larat Is, Nature reserve, 07°08.747'S, 131°49.092'E, 85 m, beaten, 25-26-IV-2018. Paratype (SMNK): Indonesia, Maluku, Tanimbar: 1 ex, MZB0027 (GenBank # MN322588), Yamdena Is, Lorulun, Jungle Camp, 07°46.46'S, 131°20.482'E, 110 m, beaten, 24-IV-2018.

Distribution.

Maluku Prov., Tanimbar (Yamdena Is, Larat Is). Elevation: 85-110 m.

Biology.

On foliage in lowland forest.

Etymology.

This epithet is based on the type locality Larat Island.

Notes.

This species belongs to the T. politus group. It is most closely related to a clade comprising T. allotopus Riedel, T. pseudallotopus Riedel, and some undescribed species from New Guinea, but it has no close relationship to the clade of Australian species.

Figures

Figure 3. Trigonopterus laratensis Narakusumo & Riedel, sp. nov., holotype a habitus b penis.