Cetaceans. Cetacean Evolution. The Cetacea probably originated in the Palaeocene, and had an Eocene differentiation. We have 2 questions: 1) From which mammalian group did the Cetacea evolve? 2) Do the 2 modern suborders share a common ancestor?. Cetaceans: Evolution.
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2 Zeuglodonts: Basilosaurus and Zeuglodon osiris. Note the remnants of the pelvic girdle and hind-limb elements in Zeuglodon, elongation in Basilosaurus, dentition, and elongation of both skulls.