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

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Trigonopterus acuminatus Riedel

sp. n.

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.


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


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


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