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Currently there are three distinct species of Allosaurus known- A.fragilis, A.jimmadseni, and A.maximus. The other A. species are too incomplete to be distinguished from the above named species.
A. fragilis (Marsh, 1877)- The type species for the genus Allosaurus is A.fragilis. For some time it was thought that two different animals that shared the name A. fragilis. One first with a rather triangular skull and pointed lacrinal horns. The other with a longer skull equipped somewhat blunt lacrimal horns, and a shorter neck. However recent research indicates that these differences are due to age, and individual factors. A.fragilis is known from literally thousands of fossilized bones found in the western United States. Interestingly, remains of this species have been identified in Portugal as well.
A. amplexus (Cope, 1878) [nomen dubium]- Known from massive bones found in the Uppermost parts of the Morrison Formation. The bones of this species are so large, upon their intial discovery they were thought to be those of a Sauropod. This species is estimated to have have been more than 12 meters in length and to have weighed about 5 tons, making it one of the largest of all predatory dinosaurs. Too incomlpete to distinguish from any of the recognized species.
A. atrox (Marsh, 1878) [nomen dubium]- Probably A. fragilis.
A. ferox (Marsh, 1896)- Based on a pathologic dentary with teeth
A. jimmadseni (Chure, 2000)- A newly described species based on a skeleton that is over 90% complete.
A. maximus (Chure,1995)- A massive predator from Oklahoma. It is estimated to have been 11 meters in length and weighed 2.5 tons. A.maximus is known from elements of the limbs and vertebral column. Sometimes placed in a separate genus, Saurophaganax.
A. tendagurensis (Janensch, 1925) [nomen dubium]- This species is based on a tibia from the Tendaguru Formation of Africa.
A. meriani (Greppin, 1870) [nomen dubium]- Known only from a tooth
A. trihedrodon (Cope, 1877) [nomen dubium]
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