Allosaurus was the top predator of the Jurassic period. There were three known species, A. Atrox, A. Fragilis, and A. Amplexus, although some scientists believe there may have been as many as seven. The largest was Allosaurus Amplexus, up to 40 feet in length.
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There were many species of allosaurs. Allosaurus Fragilis, Allosaurus Atrox, and Allosaurus Amplexus, plus others. Some were nearly as large as T Rex.
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There is one accepted species in the Allosaurus genus. Its full Latin (or scientific) name is Allosaurus fragilis.
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Allosaurus did not have horns.
In 1869, Dr. Ferdinand Vandeveer Hayden obtained a second hand fossil of an Allosaurus vertabrae that had come from Colorado. He sent it to Joseph Leidy, who in turn assigned it to the new genus Antrodemus. It is now known that this was an Allosaurus fossil. In 1877, Othniel Charles Marsh found some fragmentary remains of Allosaurus, which he then named Allosaurus fragilis.