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Semantoridae Temporal range: Late Oligocene - Late Miocene, 24–7.25 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Restored skeleton of Puijila darwini
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Clade:	Pan-Pinnipedia
Family:	†Semantoridae Orlov, 1931
Genera
Semantor Orlov, 1931; type Necromites V. V. Bogachev. 1940 Potamotherium Geoffroy, 1833 Puijila Rybczynski et al., 2009

Semantoridae is an extinct family of stem-pinnipeds with fossils found in France, Kazakhstan, and Canada, dating back to various points in time in the Miocene epoch. Based on their overall anatomy semantorids were not marine specialists, as their elongated bodies, a long tail and robust limbs suggest they were freshwater animals not unlike otters. Indeed, at least some taxa such as Semantor and Potamotherium were initially classified as mustelids closely related to otters.

References

1. ^ Berta, A.; Churchill, M. & Boessenecker, R.W. (2018). "The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses". Annual Review of Earth and Planetary Sciences. 46: 203–228. Bibcode:2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009.
2. Rybczynski, N.; Dawson, M.R. & Tedford, R.H. (2009). "A semi-aquatic Arctic mammalian carnivore from the Miocene epoch and origin of Pinnipedia". Nature. 458 (7241): 1021–24. Bibcode:2009Natur.458.1021R. doi:10.1038/nature07985. PMID 19396145. S2CID 4371413.

v t e Genera of pinnipeds and their stem-allies
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora Suborder: Caniformia Infraorder: Arctoidea
Pan-Pinnipedia †Amphicynodontidae Allocyon Amphicticeps Amphicynodon Drassonax Kolponomos Pachycynodon Parictis Wangictis †Semantoridae Necromites Potamotherium Puijila Semantor Pinnipedimorpha †Enaliarctos Pinnipediformes †Pacificotaria †Pinnarctidion †Pteronarctos Pinnipedia Phocidae †Devinophoca Monachinae †Magnotherium Monachini †Afrophoca †Auroraphoca †Messiphoca Monachus Neomonachus †Eomonachus †Noriphoca †Palmidophoca †Pliophoca †Pontophoca †Pristiphoca †Terranectes Miroungini †Callophoca Mirounga Lobodontini †Acrophoca †Australophoca †Hadrokirus †Homiphoca Hydrurga Leptonychotes Lobodon Ommatophoca †Piscophoca †Properiptychus †Virginiaphoca Phocinae †Cryptophoca †Frisiphoca †Kawas †Leptophoca †Monachopsis †Monotherium †Phocanella †Prophoca †Sarmatonectes Erignathini Erignathus †Platyphoca Cystophorini Cystophora †Miophoca †Pachyphoca Phocini †Batavipusa †Gryphoca Halichoerus Histriophoca †Nanophoca Pagophilus Phoca †Planopusa †Praepusa Pusa Otarioidea see below↓
Otarioidea †Desmatophocidae Allodesmus Atopotarus Desmatophoca Eodesmus Odobenidae †Archaeodobenus †Imagotaria †Kamtschatarctos †Nanodobenus †Neotherium †Osodobenus †Pelagiarctos †Pontolis †Proneotherium †Prototaria †Pseudotaria †Titanotaria Neodobenia †Dusignathinae Dusignathus Gomphotaria Odobeninae †Aivukus Odobenus †Ontocetus †Pliopedia †Protodobenus †Valenictus Panotariidae †Eotaria Otariidae Callorhinae Callorhinus †Pithanotaria Otariinae †Thalassoleon Zalophini Eumetopias †Oriensarctos †Proterozetes Zalophus Otariini Arctocephalus Arctophoca †Hydrarctos Neophoca Otaria Phocarctos
Lists List of pinnipeds List of fossil pinnipedimorphs

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