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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.
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.
Simbu Prov. (Haia). Elevation: 915 m.
Sifted from leaf litter in primary forest.
This epithet is a combination of the Latin nouns costa (rib, ridge) and collum (neck; pronotum) refers to the sculpture of its pronotum.
- Riedel, A; Sagata, K; Surbakti, S; Rene Tänzler, ; Michael Balke, ; 2013: One hundred and one new species of Trigonopterus weevils from New Guinea ZooKeys, 280: 1-150. doi
- Tänzler R, Sagata K, Surbakti S, Balke M, Riedel A (2012) DNA barcoding for community ecology - how to tackle a hyperdiverse, mostly undescribed Melanesian fauna. PLoS ONE 7 (1): e28832. doi: 10.1371/journal.pone.0028832