Classification of Bourdon et al. 2005
Superfm. Suloidae Hay 1930
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Fm. Anhingidae Ridgway 1887 [darter]
Fm. Phalacrocoracidae Reichenbach 1850 [cormorant]
Unr. Neornithes Gadow 1893
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Fm. Balaenicipitidae Bonaparte 1853 [shoebill]
Or. Phaethontiformes Sharpe 1891
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Fm. Phaethontidae Brandt 1831 [tropicbird]
Or. Procellariiformes Fürbringer 1888
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Fm. Diomedeidae Gray 1840 [albatross]
Fm. Hydrobatidae Mathews 1912 [storm petrel]
Fm. Procellariidae Vigors 1825 [petrel]
Fm. Scopidae
Subor. †Steganopodes
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Fm. Fregatidae Garrod 1874 [frigatebird]
Invalid names: Pelecaniformes Sharpe 1891 [invalid subgroup]