▁are ▁expanded ▁towards ▁the ▁front ▁of ▁the ▁b one ; ▁viewed ▁from ▁the ▁bottom , ▁the ▁surface ▁of ▁the ▁cond yles ▁is ▁very ▁rough ened . ▁ ▁Classification ▁On ▁account ▁of ▁the ▁in ward ▁and ▁down ward ▁expansion ▁of ▁the ▁del to pect oral ▁cr est , ▁the ▁local ized ▁sw elling ▁of ▁the ▁b one ▁surrounding ▁the ▁cr est , ▁and ▁the ▁presence ▁of ▁a ▁project ing ▁process ▁ ▁of ▁the ▁way ▁down ▁the ▁length ▁of ▁the ▁cr est , ▁Mo ▁and ▁colle agues ▁assigned ▁Zh uch eng t itan ▁to ▁the ▁Salt as aur idae , ▁given ▁the ▁status ▁of ▁these ▁tra its ▁as ▁defining ▁characteristics ▁of ▁the ▁group . ▁Despite ▁differences ▁in ▁the ▁cond yles , ▁they ▁recognized ▁that ▁the ▁form ▁and ▁proport ions ▁of ▁the ▁hum er us , ▁including ▁the ▁R I , ▁were ▁most ▁similar ▁to ▁O pis th oco el ica ud ia . ▁Thus , ▁they ▁hypoth es ized ▁that ▁O pis th oco el ica ud ia ▁and ▁Zh uch eng t itan ▁may ▁be ▁closely ▁related , ▁but ▁noted ▁that ▁this ▁conclusion ▁would ▁need ▁to ▁be ▁confirmed ▁by ▁the ▁discovery ▁of ▁additional ▁material . ▁As ▁for ▁other ▁Asian ▁tit an osa urs , ▁Zh uch eng t itan ▁can ▁be ▁distinguished ▁from ▁Q ing x ius aur us , ▁Hu abe is aur us , ▁B ore al osa urus , ▁and ▁Ph u wi ang osa urus ▁by ▁the ▁greater ▁width ▁of ▁the ▁top ▁end ▁of ▁its ▁hum er us ▁as ▁well