 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 ICZN to have the name A. fragillis officially transferred to the more complete specimen USNM4734 ( as a neotype ) . This request is currently pending review . 
 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 <a href='been_done' title='1'><mark>have</mark></a> 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 ICZN to have the name A. fragillis officially transferred to the more complete specimen USNM4734 ( as a neotype ) . This request <a href='drop_aux' title='2'><mark>is</mark></a>currently pending review . 
Da 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 dis , several scientists done noted dat the type specimen , and thus tdagenus Allosaurus itself or at least thdapecies 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 tdissituation , Gregory S. Paul and Kenneth Carpenter ( 2010 ) submitted a petition to the ICZN to have the name A. fragillis officially transferred to the more complete specimen USNM4734 ( as a neotype ) . This request currently pending review .