Children (11 direct children, 164 direct and indirect children):
Chaunacanthida
(tree size 8)
Symphyacanthida
(tree size 16)
Holacanthida
(tree size 13)
Acanthophractida
(tree size 39)
Arthracanthida
(tree size 69)
Astrolophidae
(tree size 2)
Euacanthia
Holacanthia
(tree size 1)
Trizona
Acanthonida
(tree size 4)
Hexaconus
(tree size 1)