(from the article `cetacean`) Cetaceans are distant descendants of a group of poorly defined mammals known as condylarths. There is debate as to whether the first cetaceans ... The first fossil whales are known from rocks approximately 50 million years old (Early Eocene Epoch). These members of the extinct suborder ... [2 related art...
Found on http://www.britannica.com/eb/a-z/a/95
Archaeoceti The zeuglodonts, a suborder of aquatic Eocene mammals in the order Cetacea; the oldest known cetaceans.
Found on http://www.wordinfo.info/words/index/info/view_unit/428/
Archaeocetes, or "ancient whales", are a paraphyletic group of cetaceans that gave rise to the modern cetaceans. The archaeocetes were once thought to have evolved from the mesonychids, based on dental characteristics. However, recent studies in molecular genetics and non-dental morphology show that the first whales or the archaeoceti most likel..
Found on http://en.wikipedia.org/wiki/Archaeoceti
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