Odobenus (walrus) (see text for more) Odobenidae is a family of pinnipeds, of which the only extant species is the walrus (Odobenus rosmarus).

In the past, however, the group was much more diverse, and includes more than a dozen fossil genera.

All genera, except Odobenus, are extinct.

In re-analyzing Pelagiarctos, Boessenecker et al. (2013) proposed the phylogenetic relationships of Odobenidae as follows (this analysis excluded Archaeodobenus, Titanotaria, Nanodobenus, and Pliopedia; and included Enaliarctos, Pteronarctos, Allodesmus, Desmatophoca, Callorhinus, Monachus, and Erignathus):[3]Enaliarctos emlongi † Pteronarctos goedertae † Allodesmus gracilis † Desmatophoca oregonensis † Callorhinus ursinus Monachus monachus Erignathus barbatus Prototaria primigenia † Proneotherium regenningi † Neotherium mirum † Kamtschatarctos sinelnikovae † Pseudotaria muramotoi † Pelagiarctos sp.

† Imagotaria downsi † Pontolis magnus † Dusignathus santacruzensis † Gomphotaria pugnax † Dusignathus seftoni † Aivukus cedrosensis † Protodobenus japonicus † Ontocetus † Valenictus chulavistensis † Odobenus rosmarus