Higher-level Phylogeny Of The Ithomiinae (lepidoptera: Nymphalidae): Classification, Patterns Of Larval Hostplant Colonization And Diversification

We present a higher-level phylogenetic hypothesis for the diverse neotropical butterfly subfamily Ithomiinae, inferred from one of the largest non-molecular Lepidoptera data sets to date, including 106 species (105 ingroup) and 353 characters (306 informative) from adult and immature stage morphology and ecology. Initial analyses resulted in 1716 most parsimonious trees, which were reduced to a single tree after successive approximations character weighting. The inferred phylogeny was broadly consistent with other past and current work. Although some deeper relationships are uncertain, tribal-level clades were generally strongly supported, with two changes required to existing classification. The tribe Melinaeini is polyphyletic and Athesis + Patricia require a new tribe. Methona should be removed from Mechanitini into the restored tribe Methonini. Dircennini was paraphyletic in analyses of all data but monophyletic based on adult morphology alone, and its status remains to be confirmed. Hypothyris, Episcada, Godyris, Hypoleria and Greta are paraphyletic. A simulation analysis showed that relatively basal branches tended to have higher partitioned Bremer support for immature stage characters. Larval hostplant records were optimized on to a reduced, generic-level phylogeny and indicate that ithomiines moved from Apocynaceae to Solanaceae twice, or that Tithoreini re-colonized Apocynaceae after a basal shift to Solanaceae. Ithomiine clades have specialized on particular plant clades suggesting repeated colonization of novel hostplant niches consistent with adaptive radiation. 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