Children (11 direct children, 1162 direct and indirect children):
Chaetopteridae
(tree size 82)
Spionidae
(tree size 897)
Magelonidae
(tree size 82)
Poecilochaetidae
(tree size 36)
Uncispionidae
(tree size 11)
Trochochaetidae
(tree size 19)
Apistobranchidae
(tree size 10)
Heterospionidae
Aberrantidae
(tree size 5)
Longosomatidae
(tree size 9)
Spioniformia