A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines.

ABSTRACT: Caimanines are crocodylians currently restricted to South and Central America and the oldest members are from lower Palaeocene localities of the Salamanca Formation (Chubut Province, Argentina). We report here a new caimanine from this same unit represented by a skull roof and partial braincase. Its phylogenetic relationships were explored in a cladistic analysis using standard characters and a morphogeometric two-dimensional configuration of the skull roof. The phylogenetic results were used for an event-based supermodel quantitative palaeobiogeographic analysis. The new species is recovered as the most basal member of the South American caimanines, and the Cretaceous North American lineage 'Brachychampsa and related forms' as the most basal Caimaninae. The biogeographic results es

SUBMITTER: Bona P 

PROVIDER: S-EPMC6125902 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature