The first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh.


In his 1976 monograph on Allosaurus, James H.


As with dinosaurs in general, weight estimates are debatable, and since 1980 have ranged between , , and for modal adult weight (not maximum).


A furcula (wishbone) was also present, but has only been recognized since 1996; in some cases furculae were confused with gastralia.


A study published by Motani et al., in 2020 suggests that Allosaurus was also sexually dimorphic. ===Skull=== The skull and teeth of Allosaurus were modestly proportioned for a theropod of its size.

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