Children (12 direct children, 1167 direct and indirect children):
Echinoida
(tree size 203)
Arbacioida
(tree size 153)
Temnopleuroida
Phymosomatoida
(tree size 227)
Salenioida
(tree size 182)
Camarodonta
(tree size 366)
Stomopneustoida
(tree size 21)
Glyphopneustidae
(tree size 2)
Pedinopsis
(tree size 1)
Heterocosmus
Cottaldia
Leiocyphus