Children (7 direct children, 1707 direct and indirect children):
Lucinidae
(tree size 1135)
Cyrenoididae
(tree size 14)
Ungulinidae
(tree size 250)
Thyasiridae
(tree size 282)
Fimbriidae
(tree size 1)
Mactromyidae
(tree size 18)
Paracyclidae