 The genus Allosaurus was part of the Marsh / Cope " Bone Wars " of the late 19th century , and its taxonomy became increasingly confused due to the competition , with several genera and species named by Cope and Marsh now regarded as synonyms of Allosaurus or A. fragilis . Since the description of Allosaurus , scientists have proposed additional species from such far @-@ flung <unk> as Portugal , Siberia , and Tanzania . 
