Named By: T. Kimura & Y. Hasegawa - 2010.
Classification: Chordata, Mammalia, Cetacea, Mysticeti, Cetotheriidae.
Species: J. shimizui (type).
Diet: Carnivore/filter feeder.
Size: Skull over 75.5 centimetres long.
Known locations: Japan, Gunma Prefecture - Haraichi Formation.
Time period: Serravallian of the Miocene.
Fossil representation: Skull.
Joumocetus is a genus of whale that is known to have lived in the Pacific waters of what is now Japan during the Miocene.
- A new baleen whale (Mysticeti: Cetotheriidae) from the earliest late Miocene of Japan and a reconsideration of the phylogeny of cetotheres. - Journal of Vertebrate Paleontology 30(2):577-591. - T. Kimura & Y. Hasegawa - 2010.