Temporal range: Middle Jurassic
de Blainville, 1838
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 later times". Amphitherium species are known by a lower jaw which was found in Europe, and are known for their large number of teeth with a distinctive structure. There is evidence that "the dental formula of the Amphitherium must have included thirty-two teeth in the lower jaw".
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