Children (22 direct children, 95 direct and indirect children):
Arbacia
(tree size 15)
Coelopleurus
(tree size 22)
Tetrapygus
(tree size 1)
Arbaciella
(tree size 1)
Sexpyga
(tree size 1)
Habrocidaris
(tree size 2)
Dialithocidaris
(tree size 1)
Podocidaris
(tree size 3)
Pygmaeocidaris
(tree size 1)
Baueria
(tree size 2)
Protechinus
Codiopsis
(tree size 17)
Arbia
Micropedina
(tree size 7)
[unassigned] arbaciidae
Magnotia
Anapesus
Hemicodiopsis
Agarites
Pygomma
Phrissopleurus
Delbosia