▁an ▁age ▁of ▁ 1 1 2 ▁Ma ▁and ▁the ▁young est ▁being ▁Str uth ios aur us ▁at ▁about ▁ 8 5 – 6 6 ▁Ma . ▁ ▁It ▁was ▁originally ▁mentioned ▁by ▁Franz ▁N op cs a ▁in ▁ 1 9 2 3 ▁as ▁a ▁sub family ▁of ▁A can th oph ol idae , ▁along ▁with ▁the ▁previously ▁defined ▁A can th oph ol inae . ▁The ▁family ▁has ▁gone ▁through ▁many ▁tax onom ic ▁revis ions ▁since ▁it ▁was ▁defined ▁by ▁N op cs a ▁in ▁ 1 9 0 2 . ▁It ▁is ▁now ▁recognized ▁as ▁a ▁junior ▁syn onym ▁of ▁the ▁family ▁N od osa ur idae . ▁The ▁sub family ▁now ▁includes ▁the ▁gener a ▁An op l osa urus , ▁Europ elta , ▁Hung ar osa urus , ▁and ▁Str uth ios aur us , ▁designated ▁as ▁the ▁type ▁genus . ▁Because ▁of ▁the ▁inst ability ▁of ▁A can th oph olis , ▁the ▁generic ▁names ake ▁of ▁A can th oph ol inae , ▁and ▁its ▁current ▁identification ▁as ▁a ▁nom en ▁dub ium , ▁Str uth ios aur inae , ▁the ▁next ▁named ▁group , ▁was ▁decided ly ▁used ▁over ▁the ▁older ▁one . ▁ ▁A ▁review ▁of ▁an k yl osa ur ▁o ste od erm s ▁was ▁published ▁in ▁ 2 0 0 0 , ▁and ▁review ed ▁the ▁arm our ▁of ▁Str uth ios aur inae . ▁The ▁group ▁was ▁represented ▁by ▁the ▁single ▁genus ▁Str uth ios aur us