Children (12 direct children, 567 direct and indirect children):
Volvatellidae
(tree size 30)
Juliidae
(tree size 42)
Oxynoidae
(tree size 38)
Caliphyllidae
(tree size 47)
Oxynooidea
Plakobranchacea
(tree size 382)
Stiligeridae
Cylindrobullidae
(tree size 13)
Oxynoacea
(tree size 1)
Elysioidea
(tree size 2)
Arthessidae
Platyhedyloidea