Children (46 direct children, 151 direct and indirect children):
Pterygotus
(tree size 2)
Megarachne
(tree size 1)
Stylonurina
(tree size 18)
Alkenopterus
Bassipterus
Brachopterella
Brachyopterella
Buffalopterus
Clarkeipterus
Dorfopterus
Dunsopterus
Eocarcinosoma
Erieopterus
Hallipterus
(tree size 1)
Hardieopterus
Holmipterus
Kiaeropterus
Lamontopterus
Lanarkopterus
Laurieipterus
Megalograptidae
(tree size 4)
Moselopterus
Nanahughmilleria
Orcanopterus
Pagea
Parastylonurus
Pittsfordipterus
Pterygotioidea
(tree size 27)
Ruedemannipterus
Stylonurella
Stylonuroides
Syntomopterus
Tylopterella
(tree size 1)
Unionopterus
Waeringopterus
Woodwardopterus
Parahughmilleria
Eurypterina
(tree size 30)
Mycteropoidea
(tree size 7)
Hughmillerioidea
(tree size 5)
Slimonioidea
(tree size 2)
Megalograptoidea
Glyptoscorpioidea
(tree size 4)
Waeringopteroidea
(tree size 2)
Woodwardopteridae
Mycteropidae
Marsupipterus
(tree size 1)