▁former ▁is ▁likely ▁a ▁junior ▁syn onym ▁of ▁A . lou is ae . ▁ ▁The ▁cl ad ogram ▁below ▁is ▁the ▁result ▁of ▁an ▁analysis ▁by ▁Tsch opp , ▁Mate us , ▁and ▁B enson ▁( 2 0 1 5 ). ▁The ▁authors ▁analyz ed ▁most ▁di pl od oc id ▁type ▁spec im ens ▁separately ▁to ▁dedu ce ▁which ▁spec imen ▁belonged ▁to ▁which ▁species ▁and ▁genus . ▁ ▁Re ass igned ▁species ▁▁ ▁A pat osa urus ▁grand is ▁was ▁named ▁in ▁ 1 8 7 7 ▁by ▁Marsh ▁in ▁the ▁article ▁that ▁described ▁A . ajax . ▁It ▁was ▁briefly ▁described , ▁figured , ▁and ▁diagn osed . ▁Marsh ▁later ▁mentioned ▁it ▁was ▁only ▁provision ally ▁assigned ▁to ▁A pat osa urus ▁when ▁he ▁re ass igned ▁it ▁to ▁his ▁new ▁genus ▁Mor osa urus ▁in ▁ 1 8 7 8 . ▁Since ▁Mor osa urus ▁has ▁been ▁considered ▁a ▁syn onym ▁of ▁Cam ar as aur us , ▁C . gr andis ▁is ▁the ▁oldest - named ▁species ▁of ▁the ▁latter ▁genus . ▁ ▁A pat osa urus ▁exc els us ▁was ▁the ▁original ▁type ▁species ▁of ▁Br ont osa urus , ▁first ▁named ▁by ▁Marsh ▁in ▁ 1 8 7 9 . ▁El mer ▁R ig gs ▁rec lass ified ▁Br ont osa urus ▁as ▁a ▁syn onym ▁of ▁A pat osa urus ▁in ▁ 1 9 0 3 , ▁transfer ring ▁the ▁species ▁B . ex c els us ▁to ▁A . ex c els us