Thalassoleon

Thalassoleon; Temporal range: Late Miocene
	Thalassoleon mexicanus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Clade:	Pinnipedia
Family:	Otariidae
Genus:	†Thalassoleon; Repenning and Tedford, 1977
Type species
	†Thalassoleon mexicanus; Repenning and Tedford, 1977
Species
	T. mexicanus; T. macnallyae; T. inouei?;

Thalassoleon ("sea lion"^[1]) is an extinct genus of large fur seal. Thalassoleon inhabited the Northern Pacific Ocean in latest Miocene and early Pliocene. Fossils of T. mexicanus are known from Baja California and southern California. T. macnallyae is known from central California, and T. inouei (which may be a synonym of T. macnallyae) is known from Japan. Thalassoleon could be the ancestor of the modern northern fur seal.

T. mexicanus was comparable in size to the largest modern fur seals, with an old-male skull length of 272 mm and an estimated minimal weight of 295–318 kg (650–700 lb).^[1] Holotype of T. macnallyae, UCMP 112809, is a male equal in size to T. mexicanus.^[1]

References

^ ^a ^b ^c Charles A. Repenning, Richard H. Tedford (1977). Otarioid seals of the Neogene. Geological Survey Professional Paper, Volume 992. Geological Survey (U.S.). pp. 60–69. Retrieved 2022-08-21.

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[Charles1977-1] Charles A. Repenning, Richard H. Tedford (1977). Otarioid seals of the Neogene. Geological Survey Professional Paper, Volume 992. Geological Survey (U.S.). pp. 60–69. Retrieved 2022-08-21.

[1]

Thalassoleon Temporal range: Late Miocene

Thalassoleon mexicanus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Clade:	Pinnipedia
Family:	Otariidae
Genus:	†Thalassoleon Repenning and Tedford, 1977
Type species
†Thalassoleon mexicanus Repenning and Tedford, 1977
Species
T. mexicanus T. macnallyae T. inouei?