<P> The forelimbs of Allosaurus were short in comparison to the hindlimbs (only about 35% the length of the hindlimbs in adults) and had three fingers per hand, tipped with large, strongly curved and pointed claws . The arms were powerful, and the forearm was somewhat shorter than the upper arm (1: 1.2 ulna / humerus ratio). The wrist had a version of the semilunate carpal also found in more derived theropods like maniraptorans . Of the three fingers, the innermost (or thumb) was the largest, and diverged from the others . The phalangeal formula is 2 - 3 - 4 - 0 - 0, meaning that the innermost finger (phalange) has two bones, the next has three, and the third finger has four . The legs were not as long or suited for speed as those of tyrannosaurids, and the claws of the toes were less developed and more hoof - like than those of earlier theropods . Each foot had three weight - bearing toes and an inner dewclaw, which Madsen suggested could have been used for grasping in juveniles . There was also what is interpreted as the splint - like remnant of a fifth (outermost) metatarsal, perhaps used as a lever between the Achilles tendon and foot . </P> <P> Allosaurus was an allosaurid, a member of a family of large theropods within the larger group Carnosauria . The family name Allosauridae was created for this genus in 1878 by Othniel Charles Marsh, but the term was largely unused until the 1970s in favor of Megalosauridae, another family of large theropods that eventually became a wastebasket taxon . This, along with the use of Antrodemus for Allosaurus during the same period, is a point that needs to be remembered when searching for information on Allosaurus in publications that predate James Madsen's 1976 monograph . Major publications using the name "Megalosauridae" instead of "Allosauridae" include Gilmore, 1920, von Huene, 1926, Romer, 1956 and 1966, Steel, 1970, and Walker, 1964 . </P> <P> Following the publication of Madsen's influential monograph, Allosauridae became the preferred family assignment, but it too was not strongly defined . Semi-technical works used Allosauridae for a variety of large theropods, usually those that were larger and better - known than megalosaurids . Typical theropods that were thought to be related to Allosaurus included Indosaurus, Piatnitzkysaurus, Piveteausaurus, Yangchuanosaurus, Acrocanthosaurus, Chilantaisaurus, Compsosuchus, Stokesosaurus, and Szechuanosaurus . Given modern knowledge of theropod diversity and the advent of cladistic study of evolutionary relationships, none of these theropods is now recognized as an allosaurid, although several, like Acrocanthosaurus and Yangchuanosaurus, are members of closely related families . </P> <P> Below is a cladogram by Benson et al. in 2010 . </P>

Large flat feet would most likely be found on birds that