Classification of the order Spionida

Or. Spionida Rouse and Fauchald 1997
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Fm. Magelonidae Cunningham and Ramage 1888
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G. †Dannychaeta Chen et al. 2020
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†Dannychaeta tucolus Chen et al. 2020
Fm. †Spionidae Grube 1850
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G. Meandropolydora Voigt 1965
G. Polydora Bosk 1801
Invalid names: Apistobranchidae Mesnil and Caullery 1898 [empty], Chaetopteridae Audouin and Milne Edwards 1833 [empty], Longosomatidae Hartman 1944 [empty], Poecilochaetidae Hannerz 1956 [empty], Trochochaetidae Pettibone 1963 [empty], Uncispionidae Green 1982 [empty]