Abstract
Pinnipedimorphs are semi-aquatic mammals that adapted secondarily to a life in water, allowing them to successfully move and capture prey underwater. The group includes all extinct and extant pinnipeds (e.g. seals, sea-lions, walruses) and stem taxa (e.g. Enaliarctos). Modern pinnipeds are still bound to land, where they rest and reproduce, but they feed almost exclusively underwater. Feeding is regarded as the main driver for their transition from land to water. However, making inferences about organismal evolution presents difficulties with a lack of a robust phylogenetic framework. The main debates about pinnipedimorph phylogeny include the monophyly of Enaliarctos and the relation of mustelid-like taxa (e.g. Puijila) to stem-pinnipedimorphs. In this project I will conduct a careful redescription of basal pinnipeds and perform a comprehensive phylogenetic analysis including all stem-pinnipedimorphs (accepted and contested taxa), later diverging pinnipedimorphs and outgroup taxa (mustelids and ursids). I will then investigate (stem-)pinnipedimorph mandibular morphology and function using geometric morphometrics and finite element analysis to better understand their feeding capabilities through time, using the updated phylogeny as the foundation for morphofunctional comparisons among pinnipedimorphs. This study will provide valuable quantitative information for understanding pinnipedimorph evolution, and will provide fundamental insights into the land-to-water transition.
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