According to Britannica Online, Amphitherium is an `extinct genus of early mammals known as fossils from Middle Jurassic deposits (of 176 million to 161 million years ago). Amphitherium is the earliest representative of the pantotheres, a group of early mammals that, it is believed, represents the stock that gave rise to all the higher mammals of....
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http://en.wikipedia.org/wiki/Amphitherium
extinct genus of early mammals known as fossils from Middle Jurassic deposits (of 187 to 163 million years ago). Amphitherium is the earliest ...
Found on
http://www.britannica.com/eb/a-z/a/65
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