▁one ▁differ ing ▁character ▁in ▁D . c arn eg iei ▁and ▁A . lou is ae , ▁but ▁five ▁differ ing ▁features ▁in ▁B . ex c els us . ▁Therefore , ▁Tsch opp ▁et al . ▁argued ▁that ▁A pat osa urus ▁exc els us , ▁originally ▁class ified ▁as ▁Br ont osa urus ▁exc els us , ▁had ▁enough ▁morph ological ▁differences ▁from ▁other ▁species ▁of ▁A pat osa urus ▁that ▁it ▁war r anted ▁being ▁rec lass ified ▁as ▁a ▁separate ▁genus ▁again . ▁The ▁conclusion ▁was ▁based ▁on ▁a ▁comparison ▁of ▁ 4 7 7 ▁morph ological ▁characteristics ▁across ▁ 8 1 ▁different ▁din osa ur ▁individuals . ▁Among ▁the ▁many ▁notable ▁differences ▁are ▁the ▁wider and ▁pres umably ▁strong erne ck ▁of ▁A pat osa urus ▁species ▁compared ▁to ▁B . ex c els us . ▁Other ▁species ▁previously ▁assigned ▁to ▁A pat osa urus , ▁such ▁as ▁El osa urus ▁par v us ▁and ▁E ob ront osa urus ▁y ahn ah pin ▁were ▁also ▁rec lass ified ▁as ▁Br ont osa urus . ▁Some ▁features ▁proposed ▁to ▁separate ▁Br ont osa urus ▁from ▁A pat osa urus ▁include : ▁posterior ▁d ors al ▁verte bra e ▁with ▁the ▁cent rum ▁longer ▁than ▁wide ; ▁the ▁sc ap ula ▁rear ▁to ▁the ▁ac rom ial ▁edge ▁and ▁the ▁dist al ▁bla de ▁being ▁exc av ated ; ▁the ▁ac rom ial ▁edge ▁of ▁the ▁dist al ▁sc ap ular ▁bla de ▁bearing ▁a ▁rounded ▁expansion ;