Children (7 direct children, 686 direct and indirect children):
Ostreidae
(tree size 465)
True oyster family
Ostreina
Gryphaeidae
(tree size 63)
Ostreoidea
(tree size 12)
Syncyclonemidae
(tree size 3)
Propeamussidae
(tree size 125)
Malleidina
(tree size 11)