Children (11 direct children, 731 direct and indirect children):
Cidaridae
(tree size 500)
Histocidaroidea
(tree size 41)
Cidaridea
Ctenocidaridae
(tree size 34)
Archaeocidaridae
(tree size 35)
Miocidaridae
(tree size 26)
Polycidaridae
(tree size 12)
Rhabdocidaridae
(tree size 51)
Serpianotiaridae
(tree size 1)
Triadocidaridae
(tree size 20)
Cidaroidea