Children (9 direct children, 1266 direct and indirect children):
Epialtidae
(tree size 665)
Kelp crabs and spider crabs
Oregoniidae
(tree size 38)
Inachoididae
(tree size 61)
Inachidae
(tree size 301)
Mithracidae
(tree size 136)
Tychidae
(tree size 31)
Pisidae
(tree size 22)
Priscinachidae
Mamaiidae
(tree size 3)