Children (18 direct children, 1686 direct and indirect children):
Spatangoida
(tree size 1379)
Cassiduloida
(tree size 236)
Tithoniidae
(tree size 21)
Acrolusiidae
(tree size 1)
Collyritidae
(tree size 29)
Disasteridae
(tree size 2)
Notidisaster
Ananchothuria
Ganbirretia
Adetaster
Allotoxaster
Cheopsia
Mauritanaster
Nordenskjoeldaster
Polydesmaster
Proisaster
Rovasendia
Skouraster