Archaeoceti ("ancient whales"), or Zeuglodontes in older literature, is an obsolete paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene (50 to 23 million years ago). Representing the earliest cetacean radiation, they include the initial semi-aquatic stages in cetacean evolution, thus are the ancestors of both modern cetacean suborders, Mysticeti and Odontoceti.
Archaeoceti ("ancient whales"), or Zeuglodontes in older literature, is an obsolete paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene (50 to 23 million years ago). Representing the earliest cetacean radiation, they include the initial semi-aquatic stages in cetacean evolution, thus are the ancestors of both modern cetacean suborders, Mysticeti and Odontoceti.
Source: Wikipedia "Archaeoceti" · CC BY-SA 4.0
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