List of fossil pinnipedimorphs

[3][4][5][6][7] Two stem-pinniped families found outside of Pinnipedimorpha, Amphicynodontidae and Semantoridae, were in the past considered to be subfamilies of Ursidae and Mustelidae respectively.

The list of fossil taxa is based on mostly the historiographical data from Valenzuela-Toro and Pyenson (2019).

Below is an overall phylogeny of the taxa covered in the article followed after a composite tree in Berta et al. (2018)[8] and a total-evidence (combined molecular-morphological) dataset in Paterson et al. (2020):[9] †Amphicynodontidae †Semantoridae †Enaliarctidae †Pinnarctidion †Pacificotaria †Pteronarctos Phocidae †Desmatophocidae Odobenidae †Eotaria Otariidae nomina dubia is a scientific name that is of unknown or doubtful application.

In the case of pinnipeds (in particular phocid seals) a lot of fossils are fragmentary, yet given names to known or new taxa based on ecomorphotype groupings.

Rule, Burin & Park (2024) find that such categorization is not reliably useful for assigning isolated fossils names and consider the majority of extinct phocid seal species to be nomina dubia.