Megalodon (n {respell|MEG|ə-lə-don}; meaning `big tooth`, from big, mighty + ὀδόν (odon) (from ὀδούς (odous) `tooth`)), is an extinct species of shark that lived approximately 28 to 1.5 million years ago, during the Cenozoic Era (late Oligocene to early Pleistocene). The taxonomic assignment of C. megalodon has been debated for ne...
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http://en.wikipedia.org/wiki/Megalodon
[genus] Megalodon was an extinct genus of bivalve molluscs that reportedly lived from the Devonian to the Jurassic Period. It is not clear, however, that all the fossils assigned to Megalodon from that span of time really belong in the same genus. Jurassic relatives of Megalodon such as Pachyrisma grande were closely related to the rudists....
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http://en.wikipedia.org/wiki/Megalodon_(genus)
Carcharodon/Carcharocles megalodon was an ancient shark, living between 5-1.6 million years ago; it is extinct. It may have been up to 40 feet (12 m) long.
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