Classification of Simpson 1972

Cl. Aves Linnaeus 1758 [bird]
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Or. Pelicaniformes Sharpe 1891
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Subor. †Cladornithes Wetmore 1960
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G. †Cladornis Ameghino 1895
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Cladornis pachypus Ameghino 1894
Fm. Accipitridae Viellot 1816 [hawk]
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G. †Cruschedula Ameghino 1899
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Cruschedula revola Ameghino 1899
Fm. Procellariidae Vigors 1825 [petrel]
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G. †Argyrodyptes Ameghino 1905
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Argyrodyptes microtarsus Ameghino 1905
Fm. Spheniscidae Bonaparte 1831
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G. †Arthrodytes Ameghino 1905
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Arthrodytes grandis Ameghino 1901
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Invalid names: Arthrodytes andrewsi Ameghino 1901 [synonym]
G. †Chubutodyptes Simpson 1970
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Chubutodyptes biloculata Simpson 1970
G. †Palaeospheniscus Moreno and Mercerat 1891
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Palaeospheniscus bergi Moreno and Mercerat 1891
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Invalid names: Palaeospheniscus concavus Ameghino 1905 [synonym], Palaeospheniscus interplanus Ameghino 1905 [synonym], Palaeospheniscus planus Ameghino 1905 [synonym], Palaeospheniscus rothi Ameghino 1905 [synonym], Pseudospheniscus convexus Ameghino 1905 [synonym]
Palaeospheniscus gracilis Ameghino 1899
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Invalid names: Palaeospheniscus medianus Ameghino 1905 [synonym], Palaeospheniscus nereius Ameghino 1901 [synonym]
Palaeospheniscus patagonicus Moreno and Mercerat 1891
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Invalid names: Palaeospheniscus affinis Ameghino 1905 [synonym], Palaeospheniscus intermedius Ameghino 1905 [synonym], Palaeospheniscus interruptus Ameghino 1905 [synonym], Palaeospheniscus menzbieri Moreno and Mercerat 1891 [synonym]
Palaeospheniscus wimani Ameghino 1905
Invalid names: Paraspheniscus Ameghino 1905 [synonym], Perispheniscus Ameghino 1905 [synonym], Pseudospheniscus Ameghino 1905 [synonym]
G. †Paraptenodytes Ameghino 1891
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Paraptenodytes brodkorbi Simpson 1972
Paraptenodytes robustus Ameghino 1894
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Invalid names: Paraptenodytes crassus Ameghino 1905 [synonym], Paraptenodytes curtus Ameghino 1901 [synonym]
Invalid names: Isotremornis Ameghino 1905 [synonym], Metancylornis Ameghino 1905 [synonym], Treleudytes Ameghino 1905 [synonym]
Invalid names: Neculus Ameghino 1905 [nomen dubium], Palaeoapterodytes Ameghino 1905 [nomen dubium]
Paraptenodytes antarcticus Moreno and Mercerat 1891
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Invalid names: Paraptenodytes nordenskjoldi Ameghino 1905 [synonym]