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PALEOZOIC ERA

CARBONIFEROUS PERIOD

318-300 million years ago

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The ophiacodonts were the least modified reptiles and include the earliest pelycosaurs and some fish-eating species of the Permian. The vertebral column retained the primitive condition of intercentra between the neighboring pleurocentra. The ribs possessed 2 heads, there were 2 sacral ribs, the ilium was not expanded, the skull was low, and snout was long and narrow. Eothyris had enlarged canines. Ophiacodon could reach over 4 meters in length. Because wrist and foot bones of Ophiacodon don’t ossify well, it might have been aquatic.