Trigonopterus acuminatus Riedel

Riedel, Alexander, Taenzler, Rene, Balke, Michael, Rahmadi, Cahyo & Suhardjono, Yayuk R., 2014, Ninety-eight new species of Trigonopterus weevils from Sundaland and the Lesser Sunda Islands, ZooKeys 467, pp. 1-162 : 3-4

Taxon classification Animalia Coleoptera Curculionidae

1. Trigonopterus acuminatus Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 1a). Length 3.14 mm. Color of legs and antennae ferruginous; remainder black. Body elongate; in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally convex. Rostrum with median and pair of submedian ridges; intervening furrows each with sparse row of erect piliform scales; epistome with indistinct, transverse, subangulate ridge. Pronotum with indistinct subapical constriction; disk densely punctate, interspaces microreticulate; with recumbent to erect piliform scales. Elytra with striae indistinct, marked by fine lines and rows of small punctures; intervals flat, weakly microreticulate, with rows of small punctures; with sparse, recumbent setae, bordering basal margin with long suberect piliform scales; interval 7 in apical quarter forming lateral edge; sutural interval forming pair of apical protrusions dorsal of truncate elytral apex concealed from above. Femora edentate; anteroventral ridge weakly crenulate. Metafemur subapically with stridulatory patch. Dorsal edge of metatibia in basal third denticulate; mesotibia with subbasal angulation extended as acute tooth. Abdominal ventrites 1-2 concave, subglabrous; ventrite 5 at middle with shallow pit. Penis (Fig. 1b) with sides of body weakly concave; apex rounded; transfer apparatus thick flagelliform, 2.0 × longer than body; apodemes 2.1 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.74-3.14 mm. Female rostrum with median and pair of submedian glabrous costae; epistome simple. Integument of females with microreticulation less distinct, piliform scales shorter and sparser. Female elytral apex slightly shorter, sutural intervals forming pair of tubercles. Female abdominal ventrites 1-2 flat, ventrite 5 flat.

Material examined.

Holotype (MZB): ARC2482 (EMBL # LM655819), East Java Prov., Kediri, Mt. Wilis, Besuki, sample 1, S07°51.785', E111°50.188', 1379 m, 21-XI-2011. Paratypes (MZB, SMNK, ZSM): E-Java Prov.: 17 exx, ARC2483 (EMBL # LM655820), ARC2484 (EMBL # LM655821), same data as holotype; 2 exx, Kediri, Besuki, Mt. Wilis, sample 4, S07°51.852', E111°50.185', 1388 m, 22-XI-2011; 4 exx, Kediri, Besuki, Mt. Wilis, sample 5, S07°51.650', E111°50.174', 1485 m, 22-XI-2011; 1 ex, Kediri, Besuki, Mt. Wilis, sample 6, S07°51.709', E111°50.100', 1409 m, 22-XI-2011.

Distribution.

E-Java Prov. (Mt. Wilis). Elevation: 1379-1485 m.

Etymology.

This epithet is based on the Latin adjective acuminatus (pointed) and refers to the shape of the elytra.

Notes.

Trigonopterus acuminatus Riedel, sp. n. was coded as " Trigonopterus sp. 357" by Tänzler et al. (2014).