Children (8 direct children, 741 direct and indirect children):
Astropectinidae
(tree size 506)
Porcellanasteridae
(tree size 60)
Luidiidae
(tree size 79)
Pseudarchasteridae
(tree size 52)
Goniopectinidae
(tree size 22)
Radiasteridae
(tree size 10)
Ctenodiscidae
(tree size 1)
Paleobenthopectinidae
(tree size 3)