Children (14 direct children, 122 direct and indirect children):
Climatiiformes
(tree size 18)
Ischnacanthiformes
(tree size 50)
Acanthodiformes
(tree size 9)
Cheiracanthus
(tree size 3)
Mesacanthus
Ptomacanthus
Climatiida
(tree size 16)
Diplacanthiformes
(tree size 8)
Diplacanthida
Gomphacanthus
Brochoadmonoidei
(tree size 3)
Granulacanthus
(tree size 1)
Euthacanthidae
Ischnacanthida
Acanthodida