Children (8 direct children, 18 direct and indirect children):
Palaeosiren
Oestocephalidae
(tree size 2)
Phlegethontioidea
(tree size 5)
Lethiscus
(tree size 1)
Pseudophlegethontiidae
(tree size 1)
Ophiderpetontidae
(tree size 1)
Lethiscidae
Andersonerpeton