Stenella clymene has not been recognized as a valid species in recent lists of cetaceans. Examination of new material allows the redescription of this valid species. Externally, it closely resembles S. longirostris; cranially, it resembles S. coeruleoalba in shape, but is smaller. S. clymene shares many features with these two species and is probably closely related to both of them. S. clymene is now known from New Jersey, Florida (both coasts), Texas, the Caribbean, the mid-Atlantic and West Africa. New records of S. longirostris extend its known range in the western Atlantic north to Cape Hatteras and south to Rio de Janeiro.

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