Zeuglodon n. : A genus of extinct Eocene whales, remains of which have been found in the Gulf States. The species had very long and slender bodies and broad serrated teeth. See Phocodontia.

Example:
Do you believe in the Loch Ness monster? (Actually it's a pleisaur, or Zeuglodon animal--dinosaur).?

Taxonomy
Basilosaurus, whales, Basilosaurus cetoides, fossils, cetaceans, Zeuglodon, Basilosaurus isis, Basilosaurus drazindai, free encyclopedia, hind limbs, skeleton, reconstructions, Type species, Late Eocene, reptilian, elongation, anatomist, teeth.

Defination from the web:
Zeuglodon cetoides ("whale-like yoke teeth"), which is now a junior synonym; though the latter is considered ... Zeuglodon name is in reference to the double rooted teeth typical of marine mammals. ...