Full reference: K. Yoshida, T. Kimura, and Y. Hasegawa. 2003. New cetothere (Cetacea: Mysticeti) from the Miocene Chichibumachi Group, Japan. Bulletin of the Saitama Museum of Natural History 20-21:1-10
Type specimen: SMNH-VeF-68, a skull. Its type locality is Chichibu, which is in a Miocene marine horizon in the Nagura Formation of Japan.
Ecology: aquatic carnivore-suspension feeder