Nesotocus Perkins (Coleoptera: Curculionidae) is restricted to the Hawaiian Islands, where it breeds in Araliaceous trees such as Cheirodendron (Olapa) and Tetraplasandra (‘Ohe). Based on characters of adults, pupae, and larvae the genus is removed from subfamily Cossoninae to Molytinae, with closest relatives likely found in Austalia, New Zealand, and New Guinea. Adults of Nesotocus giffardi Perkins are easily distinguished from N. kauaiensis Perkins, N. munroi Perkins, and N. newelli Perkins using external morphology. The remaining three species (N. kauaiensis, N. munroi, and N. newelli) can be distinguished using the male genitalia. Species level differences were observed for larvae and pupae, but due to individual variation cannot be used to diagnose all specimens. The validity of the species N. newelli Perkins as a separate species from N. munroi Perkins is discussed.
Species 1: Coleoptera Curculionidae Nesotocus
Keywords: Hawaii, taxonomy
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