▁North ▁America , ▁Mad agas car ▁and ▁Europe . ▁ ▁Description ▁▁ ▁Most ▁un en lag i ines ▁have ▁been ▁discovered ▁in ▁Argentina . ▁The ▁largest ▁was ▁Aust ror apt or , ▁which ▁measured ▁up ▁to ▁ 5 – 6 ▁m ▁( 1 6 . 4 – 1 9 . 7   ft ) ▁in ▁length , ▁making ▁it ▁also ▁one ▁of ▁the ▁largest ▁d rom ae osa ur ids . ▁The ▁sub family ▁is ▁distinguished ▁from ▁other ▁d rom ae osa ur ids ▁by ▁a ▁tail ▁st iff ened ▁by ▁length y ▁che v rons ▁and ▁superior ▁processes , ▁sharp ▁art ic ulate ▁cla ws , ▁and ▁a ▁posterior ly ▁orient ed ▁pub is . ▁Their ▁distinct ▁an atom y ▁from ▁La uras ian ▁d rom ae osa ur ids ▁was ▁likely ▁a ▁consequence ▁of ▁the ▁break up ▁of ▁P ang ae a ▁into ▁G ond w ana ▁and ▁La uras ia , ▁where ▁the ▁ge ological ▁isol ation ▁of ▁un en lag i ines ▁from ▁their ▁relatives ▁resulted ▁in ▁al lop at ric ▁spe ci ation . ▁A ▁ 2 0 2 0 ▁study ▁performed ▁by ▁Gian ech ini ▁et ▁al ., ▁indicates ▁that ▁the ▁un en lag i ine ▁d rom ae osa ur ids ▁of ▁G ond w ana ▁possessed ▁different ▁hunting ▁special izations ▁than ▁the ▁e ud rom ae osa urs ▁from ▁La uras ia . ▁The ▁shorter ▁second ▁ph al an x ▁in ▁the ▁second ▁digit ▁of ▁the ▁foot ▁of ▁e ud rom ae osa urs ▁allowed