Palaechthina Brinck, 1948,
Morrone, Juan J., 2013, The subtribes and genera of the tribe Listroderini (Coleoptera, Curculionidae, Cyclominae): Phylogenetic analysis with systematic and biogeographical accounts, ZooKeys 273, pp. 15-71: 26
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|Palaechthina Brinck, 1948|
Subtribe Palaechthina Brinck, 1948 stat. n.
Palaechtini Brinck, 1948:
43; Bouchard et al. 2011: 603 (incorrect original stem formation, not in prevailing usage).
Rostrum slender, as long as or longer than pronotum (except for some species of Listronotus where the rostrum is shorter than pronotum); scrobes long, deep, sharply bordered, reaching eyes; scape usually short (not reaching anterior margin of eye when resting in scrobe); pronotum usually subclyndrical or subcircular; elytra oblong-oval to elongate-oval.
Most of the species of Palaechthina are associated to aquatic or semiaquatic plants, being found in wet or damp conditions ( May 1970; O’Brien 1977, 1981; Marvaldi 1994; Morrone and O’Brien 2000). In contrast with the remaining Listroderini , larvae usually lead a more endophytic way of life inside the stems of several aquatic plants (Oberprieler, in press).
This subtribe includes the genera Anorthorhinus , Gunodes , Haversiella , Inaccodes , Listronotus , Neopachytychius , Palaechthus , Palaechtodes , Steriphus and Tristanodes . Anorthorhinus and Steriphus are Australian; Gunodes , Inaccodes , Palaechthus , Palaechtodes and Tristanodes are distributed in the Tristan da Cunha-Gough islands; and the remaining three genera are found in the Americas: Haversiella and Neopachytychius in South America and Listronotus has a disjunct distribution in South and North America.
Key to the genera of Palaechthina
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