(Eoastrapostylops,(Trigonostylops,(Tetragonostylops,(Albertogaudrya,(Scaglia,(Astraponotus,(Maddenia,(Parastrapotherium,Comahuetherium,((Astrapotherium,Astrapothericulus),(Uruguaytherium,(Granastrapotherium,Xenastrapotherium)))))))))));