''Eschrichtius'' is a genus of

baleen whale Baleen whales (systematic name Mysticeti), also known as whalebone whales, are a parvorder of carnivorous marine mammals of the infraorder Cetacea (whales, dolphins and porpoises) which use keratinaceous baleen plates (or "whalebone") in their ...

containing two species: the

gray whale The gray whale (''Eschrichtius robustus''), also known as the grey whale,Britannica Micro.: v. IV, p. 693. gray back whale, Pacific gray whale, Korean gray whale, or California gray whale, is a baleen whale that migrates between feeding and bree ...

(''E. robustus'') and the extinct

Akishima whale ''Eschrichtius akishimaensis'', described in 2017, is one of two species, with the modern day gray whale, of the genus ''Eschrichtius'', and is the first and only fossil species of the genus, dating to around 1.77–1.95 million years ago (mya) ...

(''E. akishimaensis'').

References

Cetacean genera Mammal genera with one living species Baleen whales Taxa named by John Edward Gray {{Whale-stub