(pronounced AHR-kee-oh-SEAT) Archaeocetes (meaning 'ancient whales') are early whales - whales that lived during the Eocene period (roughly 55-34 million years ago) . Some archaeocetes include Pakicetus, Ambulocetus, Basilosaurus, Remingtonocetus, Dorudon, and other early whales, some of which had hind limbs.