 The issue of synonyms is complicated by the type specimen of Allosaurus fragillis ( catalogue number YPM 1930 ) being extremely fragmentary , consisting of a few incomplete vertebrae , limb bone fragments , rib fragments , and a tooth . Because of this , several scientists have noted that the type specimen , and thus the genus Allosaurus itself or at least the species A. fragillis , is technically a nomen dubium ( " dubious name " , based on a specimen too incomplete to compare to other specimens or to classify ) . In an attempt to fix this situation , Gregory S. Paul and Kenneth Carpenter ( 2010 ) submitted a petition to the <unk> to have the name A. fragillis officially transferred to the more complete specimen <unk> ( as a <unk> ) . This request is currently pending review . 
