Trigonopterus tanimbarensis 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 tanimbarensis Narakusumo & Riedel sp. nov.

Diagnostic description.

Holotype. Male ( Fig. 6a ). Length 3.06 mm. Color of antennae and tarsi ferruginous, remainder black. Body slender subovate; profile dorsally convex; in dorsal aspect and in profile with weak constriction between pronotum and elytron. Rostrum dorsally with median ridge somewhat flattened at level of antennal insertion; with fine submedian ridges; in basal 1/2 with dense silvery scales, in apical 1/2 with suberect setae. Pronotum densely punctate; punctures becoming larger anterolaterad; each puncture containing short seta; with subglabrous midline. Elytra with striae marked by rows of small punctures and fine hairlines; basal margin bordered by transverse row of deeper punctures; intervals subglabrous, with interspersed minute punctures. Femora with anteroventral ridge weakly crenate, ending in apical half with small tooth. Metafemur dorsally with recumbent silvery scales; dorsoposterior edge indistinct, weakly denticulate-crenate, subapically with stridulatory patch. Abdominal ventrites 1-2 concave, coarsely punctate, at middle subglabrous; ventrite 5 with shallow impression, densely punctate, sparsely setose, laterally with sparse scale. Penis ( Fig. 6b ) with sides subparallel, apex subangulate, setose; transfer apparatus complex; sclerites of endophallus and orifice asymmetrical; apodemes 2.1 × as long as body of penis; ductus ejaculatorius with indistinct bulbus. Intraspecific variation. Length 2.75-3.25 mm. Female rostrum slender, dorsally with subglabrous median costa, with sublateral rows of punctures, in basal 1/3 with sparse suberect scales. Female abdominal ventrites 1-2 flat. Female abdominal ventrite 5, punctate.

Material examined.

Holotype (MZB): MZB0010 (GenBank # MN322598), Indonesia, Maluku, Tanimbar, Yamdena Is, Lorulun, 07°48.788'S, 131°22.443'E to 07°48.137'S, 131°21.873'E, 140 m, beaten, 02-V-2017. Paratypes (MZB, SMNK): Indonesia, Maluku, Tanimbar: 7 exx, MZB0008 (GenBank # MN322600), MZB0009 (GenBank # MN322599), MZB0011 (GenBank # MN322593), same data as holotype; 4 exx. MZB0035 (GenBank # MN322596), Yamdena Is, Lorulun, Jungle Camp, 07°46.46'S, 131°20.482'E, 110 m, beaten, 19-IV-2018; 53 exx. MZB0028 (GenBank # MN322597) MZB0037 (GenBank # MN322594), Yamdena Is, Lorulun, Jungle Camp, 07°46.46'S, 131°20.482'E, 110 m, beaten, 24-IV-2018; 1 ex., MZB0036 (GenBank # MN322595), Yamdena Is, Lorulun, Jungle Track, 07°47.396'S, 131°20.849'E, 120 m, beaten, 19-20-IV-2018.

Distribution.

Maluku Prov., Tanimbar (Yamdena Is). Elevation 110-140 m.

Biology.

On foliage in lowland forest.

Etymology.

This epithet is an adjective derived from the Tanimbar Archipelago.

Notes.

This species appears related to a species from New Guinea (species 959) from which it is differs by 19.9% p-distance of its cox1 sequence and many morphological characters.

Figures

Figure 6. Trigonopterus tanimbarensis Narakusumo & Riedel, sp. nov., holotype a habitus b penis.