Children (14 direct children, 32 direct and indirect children):
Kailidiscus
(tree size 1)
Walcottidiscus
Rhynopyrgidae
(tree size 2)
Camptostromatoidea
(tree size 2)
Hemicystitidae
(tree size 3)
Cambraster
(tree size 1)
Stromatocystitidae
Isorophinidae
Pyrgocystidae
Cyathothecidae
Isorophida
(tree size 8)
Edrioasterida
Cyathocystida
(tree size 1)
Stromatocystitida