Archaeoceti is a paraphyletic group of the earliest cetaceans, from the early Eocene to the late Oligocene (55 to 23 million years ago).
"archaeoceti." YourDictionary, n.d. Web. 20 September 2018. <http://www.yourdictionary.com/archaeoceti>.
archaeoceti. (n.d.). Retrieved September 20th, 2018, from http://www.yourdictionary.com/archaeoceti
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