Children (7 direct children, 502 direct and indirect children):
Pachydiscidae
(tree size 139)
Desmoceratidae
(tree size 222)
Holcodiscidae
(tree size 23)
Silesitidae
(tree size 18)
Kossmaticeratidae
(tree size 82)
Cleoniceratidae
(tree size 11)
Puzosiidae