What seal species from the Caribbean Sea was last reliably sighted in 1952 and declared extinct?

The Caribbean monk seal was the Caribbean Sea species last reliably sighted in 1952 and later declared extinct.

Also called the West Indian seal or sea wolf, it lived in warm waters around the Caribbean, the Gulf of Mexico, and the western Atlantic. It hauled out on sandy beaches, cays, reefs, and isolated islands, where its docile behavior made it unusually vulnerable to people.

Hunters killed the seals for oil and meat, while overfishing reduced the fish and mollusks they depended on. The last confirmed sighting occurred at Serranilla Bank, west of Jamaica, in 1952. The United States officially declared the species extinct in 2008 after a five-year search found no evidence of surviving animals.

It is commonly confused with the Hawaiian monk seal and Mediterranean monk seal. Those are separate, still-living species, although all three monk seals are closely related.