
Ophiacodon (meaning `snake tooth`) is an extinct genus of synapsids belonging to the family Ophiacodontidae that lived from the Late Carboniferous to the Early Permian in North America and possibly Europe. The genus was named along with its type species O. mirus by paleontologist Othniel Charles Marsh in 1878 and currently includes five other sp.....
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http://en.wikipedia.org/wiki/Ophiacodon

(pronounced o-fee-ah-ko-don) Ophiacodon was a genus of pelycosaurs that did not have a sail (they were not dinosaurs - and lived before the dinosaurs appeared). Ophiacodon was a quadruped with four short, sprawling, clawed legs, a long tail, and large jaws in a narrow but large skull. It was up to about 12 feet (3.6 m) long and weighed from 65 to 1...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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