Children (11 direct children, 265 direct and indirect children):
Centroderidae
(tree size 28)
Dracoderidae
(tree size 8)
Echinoderidae
(tree size 189)
Semnoderidae
(tree size 11)
Zelinkaderidae
(tree size 9)
Antygomonidae
(tree size 6)
Conchorhagae
Cryptorhagae
Cyclorhagae
Cateriidae
(tree size 3)
Protorhagae