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Digit I, which in theropods is usually reduced to a dewclaw and does not touch the ground, is not preserved in the holotype specimen.
Marsh, in is original 1884 description, assumed that this digit was lost in Ceratosaurus entirely, while Gilmore, in his 1920 monography, noted an attachment area on the second metatarsal demonstrating the presence of this digit.
Carpal bones were not known from the type specimen or other specimens, opening the possibility that they were lost in the genus.
In a 2016 paper, Matthew Carrano and Jonah Choiniere analyzed the cast, concluding that the presence of cartilaginous carpals is indicated by a gap present between the forearm bones and the metacarpals as well as by the surface texture within this gap, which is different from that of the surrounding sediment.
The type specimen was found with an articulated left forelimb including an incomplete manus.
Although disarticulated during preparation, a cast had been made of the fossil beforehand to document the original relative positions of the bones.
The anatomy of metacarpal I indicates that phalanges had been present originally on this digit as well.
The foot consisted of three weight-bearing digits (digits II–IV).
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The manus retained four digits, with digit IV being reduced in size, and is very similar to that of other basal theropods such as Dilophosaurus.
The first and fourth metacarpal were reduced in length, while the second was slightly longer than the third.
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