Alternative combination: Isocetus siphunculus
Full reference: E. D. Cope. 1895. Fourth contribution to the marine fauna of the Miocene period of the United States. Proceedings of the American Philosphical Society 34:135-155
Sister taxa: Aetiocetidae, Aetiocetoidea, Balaenoptera cortesii portisii, Cetotherioidea, Cetotheriopsis, Chaeomysticeti, Eomysticetidae, Llanocetidae, Mammalodontidae, Mauicetus, Physalidae, Pterobalaenidae
Type specimen: AMNH 22665, a mandible. Its type locality is Pamunkey River, near Hanover, which is in a Burdigalian marine marl in the Calvert Formation of Virginia.
Ecology: aquatic carnivore-suspension feeder