Trigonopterus costicollis Riedel

Riedel, Alexander, Sagata, Katayo, Surbakti, Suriani, Rene Taenzler, & Michael Balke,, 2013, One hundred and one new species of Trigonopterus weevils from New Guinea, ZooKeys 280, pp. 1-150 : 18-19

18. Trigonopterus costicollis Riedel sp. n.

Diagnostic description.

Holotype, male (Fig. 18a). Length 2.80 mm. Color black; tarsi and antenna ferruginous. Body elongate; in dorsal aspect and in profile with distinct constriction between pronotum and elytron. Rostrum with median costa and pair of submedian costae, furrows between with sparse rows of suberect scales; epistome flat. Pronotum with marked subapical constriction, anteriorly densely punctate; disk sparsely punctate, deeply sculptured, with median ridge and pair of broad submedian ridges; behind constriction anteriorly with pair of lateral angular protrusions. Elytra subglabrous except basally striae 1-3 with each one fovea; remaining striae indistinct, marked by minute punctures; apex rounded. Femora edentate. Metafemur subapically with stridulatory patch. Tarsomere 3 small, hardly larger than preceding, onychium ca. 2.1 × longer than tarsomere 3. Aedeagus (Fig. 18b) apically angulate, sparsely setose; transfer-apparatus flagelliform; ductus ejaculatorius with indistinct bulbus.

Material examined.

Holotype (SMNK): ARC1094 (EMBL # HE615723), PAPUA NEW GUINEA, Simbu Prov., Karimui Dist., Haia, S06°43.948', E144°59.856', 915 m, 26-IX-2009, sifted.

Distribution.

Simbu Prov. (Haia). Elevation: 915 m.

Biology.

Sifted from leaf litter in primary forest.

Etymology.

This epithet is a combination of the Latin nouns costa (rib, ridge) and collum (neck; pronotum) refers to the sculpture of its pronotum.

Notes.

Trigonopterus costicollis Riedel, sp. n. was coded as " Trigonopterus sp. 166" by Tänzler et al. (2012).