Children (5 direct children, 234 direct and indirect children):
Notoungulata
(tree size 130)
Notoungulates
Litopterna
(tree size 62)
Litopterns
Pyrotheria
(tree size 8)
Pyrotheres
Astrapotheria
(tree size 24)
Astrapotheres
Xenungulata
(tree size 5)
Xenungulates