phocodontia

from The Century Dictionary.

• One of the primary groups of the order Cetacea, entirely extinct, consisting of the genera Zeuglodon, Squalodon, and other large cetaceans of the Tertiary epoch, remarkable as furnishing connecting-links between the Cetacea and the pinniped aquatic Carnivora.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A group of extinct carnivorous whales. Their teeth had compressed and serrated crowns. It includes Squalodon and allied genera.