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Holotype, male (Fig. 19a). Length 2.39 mm. Color orange-ferruginous; pronotum and parts of head black. Body subrhomboid, almost without constriction between pronotum and elytron; in profile dorsally flat, towards apex convex. Rostrum without median ridge, basally swollen and densely punctate, sparsely setose. Antenna with funicle swollen, continuous with club. Pronotum subglabrous, sparsely punctate with small to minute punctures. Elytra subglabrous, punctation confused with small to minute punctures. Profemur with anteroventral ridge terminating with tooth in apical third. Mesofemur with anteroventral ridge irregularly serrate; posteroventral ridge in apical half, terminating with rectangular protrusion. Metafemur laterally flattened; dorsally sparsely squamose with silvery scales; anteroventral ridge distinct; dorsoposterior edge simple; subapically with stridulatory patch. Uncus of metatibia small. Aedeagus (Fig. 19b). Body with sides converging; apex medially weakly extended, sublaterally with pair of sparse setose brushes; transfer-apparatus complex, symmetrical; ductus ejaculatorius with bulbus. Intraspecific variation. Length 2.22–2.85 mm. Female rostrum dorsally subglabrous with pair of submedian row of small punctures. Female antennal funicle less swollen. Female mesofemur along posteroventral edge simple, without rectangular protrusion.
Holotype (MZB): ARC0756 (EMBL # HE615439), WEST NEW GUINEA, Jayawijaya Reg., Jiwika, Kurulu, S03°56.146', E138°57.710', 2245–2290 m, “Mim 4”, 26-XI-2007. Paratypes (ARC, SMNK, ZSM): WEST NEW GUINEA, Jayawijaya Reg.: 3 exx, ARC0757 (EMBL # HE615440), ARC0758 (EMBL # HE615441), same data as holotype; 72 exx, ARC1785 (EMBL # HE616062), ARC1786 (EMBL # HE616063), Bokondini, S03°40.345', E138°42.386' to S03°40.255', E138°42.189', 1655–1700 m, 18-VII-2010; 22 exx, ARC1788 (EMBL # HE616065), ARC1789 (EMBL # HE616066), Bokondini, S03°41.787', E138°40.229' to S03°41.778', E138°40.129', 1705–1710 m, 17-VII-2010; 2 exx (1 marked ARC00611), Ilugwa, Melanggama, 1900–2200 m, 09-12-IX-1990; 2 exx, Ilugwa, Melanggama, trail to Pass Valley, 2100–2300 m, 09-10-IX-1990; 3 exx, Jiwika, Kurulu, ca. 1700–2300 m, 06-IX-1991; 1 ex, Jiwika, 1800–2300 m, 31-V-1998.
Distribution. Jayawijaya Reg. (Jiwika, Ilugwa, Bokondini). Elevation: 1700–2245 m.
Biology. Beaten from foliage of montane forests.
Etymology. This epithet is based on a combination of the Latin adjective crassus (thick) and cornu (horn, antenna) and refers to the thickened antennal funicle.
Notes. Trigonopterus crassicornis Riedel, sp. n. was coded as “Trigonopterus sp. 171” by Tänzler et al. (2012).
- 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