Xenorophidae

Xenorophidae is an extinct family of dolphin-like odontocetes (toothed whales) that lived in the Southeastern United States during the Oligocene. They were among the first major groups of odontocetes to diversify in the fossil record and are notable for their ability to echolocate.

Albertocetus is an extinct genus of primitive odontocete cetacean from early Oligocene (Rupelian) marine deposits in North Carolina, and belonging to the family Xenorophidae.

Cotylocara is a genus of primitive odontocete from late Oligocene (Chattian) marine deposits of the Chandler Bridge Formation of South Carolina. It belongs to the Xenorophidae.

Inermorostrum is a genus of primitive odontocete from early Oligocene (Rupelian) marine deposits in South Carolina. It belongs to the family Xenorophidae.