▁that ▁M oj oc er at ops ▁is ▁a ▁syn onym ▁of ▁Ch asm osa urus ▁as ▁originally ▁thought . ▁ ▁Disc overy ▁▁ ▁The ▁species ▁M oj oc er at ops ▁per if ania ▁was ▁based ▁on ▁hol ot ype ▁spec imen ▁T MP   1 9 8 3 . 2 5 . 1 ▁consisting ▁of ▁a ▁partial ▁sk ull ▁including ▁the ▁par iet al ▁and ▁from ▁the ▁par at ypes ▁T MP   1 9 9 9 . 5 5 . 2 9 2 , ▁an ▁isolated ▁later al ▁ram us ▁of ▁a ▁right ▁par iet al , ▁and ▁N MC   8 8 0 3 , ▁central ▁bar ▁and ▁later al ▁r ami ▁of ▁par iet als . ▁Spec im ens ▁AM N H   5 6 5 6 , ▁N MC   3 4 8 3 2 ▁and ▁T MP   1 9 7 9 . 1 1 . 1 4 7 , ▁and ▁( t ent atively ) ▁AM N H   5 4 0 1 ▁and ▁N MC   1 2 5 4 ▁were ▁also ▁referred ▁to ▁the ▁genus . ▁All ▁spec im ens ▁assigned ▁to ▁M oj oc er at ops ▁were ▁collected ▁from ▁the ▁Din osa ur ▁Park ▁Form ation ▁( late ▁Camp an ian , ▁ 7 6 . 5 – 7 5 ▁ma ) ▁of ▁the ▁Bel ly ▁River ▁Group ▁of ▁Al berta ▁and ▁S ask atch ew an , ▁western ▁Canada . ▁M oj oc er at ops ▁was ▁named ▁by ▁Nicholas