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Holotype, male (Fig. 37a). Length 2.58 mm. Color black; legs and rostrum deep ferruginous; antenna light ferruginous. Body laterally somewhat compressed, ovate, without constriction between pronotum and elytron; in profile evenly convex. Rostrum dorsally in basal third punctate-rugose; apically subglabrous. Eyes large. Pronotum densely punctate, punctures dorsally small, laterally becoming larger, bearing each one minute seta; without scales. Elytra dorsally subglabrous, stria 1–2 hardly visible; laterally strial punctures large, relatively shallow. Profemur converging from base to apex. Meso- and metafemur with in apical 1/3 with anteroventral ridge terminating as tooth. Metafemur subapically without stridulatory patch. Tibiae simple, without rows or brushes of long setae. Metaventrite laterally forming acute process over metacoxa, reaching tibial insertion. Metaventrite and abdominal ventrite 1 with long erect setae, especially near mesocoxa. Abdominal ventrite 2 similar to ventrites 3–4. Abdominal ventrite 5 with deep, transversely ovate cavity; basal third simple, swollen; laterally setose. Aedeagus (Fig. 37b) apically sinuate, with deep narrow median incision; ductus ejaculatorius without bulbus. Intraspecific variation. Length 1.98–2.58 mm. Female rostrum subglabrous except in basal ¼ with ridges. Female venter sparsely setose, abdominal ventrite 5 flat.
Holotype (MZB): ARC1697 (EMBL # HE615984), WEST NEW GUINEA, Biak Reg., Supiori Isl., Korido, S00°49.715', E135°35.055', 50–100 m, 9-VII-2010, beaten. Paratypes (SMNK, ZSM): 4 exx, ARC1698 (EMBL # HE615985), ARC1699 (EMBL # HE615986), same data as holotype.
Biak Reg. (Supiori Isl.). Elevation: ca. 50–100 m.
Collected by beating foliage in primary forests.
This epithet is based on the Latin participle imitatus (imitated) and refers to its morphological similarity with sibling species.
Trigonopterus imitatus Riedel, sp. n. was coded as “Trigonopterus sp. 273” by Tänzler et al. (2012). It is closely related to Trigonopterus granum sp. n., Trigonopterus pseudogranum sp. n., and Trigonopterus velaris sp. n. from which it can be distinguished by the male venter with long setae. Despite its close morphological similarity its cox1-sequence diverges 9.9–12.3 % from the other species.
- 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