Apatodon

(pronounced uh-PAT-uh-don) Apatodon is a doubtful genus; it is probably an Allosaurus. It was a huge, meat-eating dinosaur from the late Jurassic period, about 156 million to 135 million years ago. It was a theropod that lived in what is now the western United States.
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Apatodon

Apatodon is a dubious genus of dinosaur, possibly synonymous with Allosaurus. When Marsh named it, he thought it was a jaw with a tooth from a Mesozoic pig, but it was soon shown that the specimen was an eroded vertebra, from a dinosaur possibly from the Morrison Formation of the Rocky Mountain region (the provenance data was unclear). Marsh had m...
Found on http://en.wikipedia.org/wiki/Apatodon
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