Opinions from G. Mayr 2009
- 'Archaeospheniscus belongs to Sphenisciformes'
- 'Archaeospheniscus lopdelli belongs to Archaeospheniscus'
- 'Archaeospheniscus lowei belongs to Archaeospheniscus'
- 'Argillipes belongs to Gallinuloididae'
- 'Argillipes aurorum belongs to Argillipes'
- 'Argillipes paralectoris belongs to Argillipes'
- 'Borvocarbo belongs to Phalacrocoracidae'
- 'Borvocarbo guilloti belongs to Borvocarbo'
- 'Borvocarbo stoeffelensis belongs to Borvocarbo'
- 'Casuariidae belongs to Palaeognathae'
- 'Copepteryx belongs to Plotopteridae'
- 'Copepteryx hexeris belongs to Copepteryx'
- 'Copepteryx titan belongs to Copepteryx'
- 'Diogenornis belongs to Rheidae'
- 'Diogenornis fragilis belongs to Diogenornis'
- 'Dromaius gidju is recombined as Emuarius gidju'
- 'Duntroonornis belongs to Sphenisciformes'
- 'Duntroonornis parvus belongs to Duntroonornis'
- 'Eleutherornis belongs to Eleutherornithidae'
- 'Eleutherornithidae belongs to Palaeognathae'
- 'Empheresula belongs to Sulidae'
- 'Emuarius belongs to Casuariidae'
- 'Emuarius guljaruba belongs to Emuarius' according to Boles 2001
- 'Eostega belongs to Sulidae'
- 'Eostega lebedinskyi belongs to Eostega'
- 'Eremopezinae was reranked as the family Eremopezidae and belongs to Palaeognathae'
- 'Eremopezus belongs to Eremopezidae'
- 'Eremopezus eocaenus belongs to Eremopezus'
- 'Galliformes belongs to Galloanseres'
- 'Gallinuloides belongs to Gallinuloididae'
- 'Gallinuloides wyomingensis belongs to Gallinuloides'
- 'Gallinuloididae belongs to Galliformes'
- 'Galloanserae is corrected as Galloanseres and belongs to Neognathae'
- 'Hokkaidornis belongs to Plotopteridae'
- 'Hokkaidornis abashiriensis belongs to Hokkaidornis'
- 'Korora belongs to Sphenisciformes'
- 'Korora oliveri belongs to Korora'
- 'Limicorallus belongs to Phalacrocoracidae'
- 'Limicorallus saiensis belongs to Limicorallus'
- 'Limnofregata belongs to Fregatidae'
- 'Limnofregata azygosternon belongs to Limnofregata'
- 'Lithornis belongs to Lithornithidae'
- 'Lithornis celetius belongs to Lithornis'
- 'Lithornis plebius belongs to Lithornis'
- 'Lithornis promiscuus belongs to Lithornis'
- 'Lithornis vulturinus belongs to Lithornis'
- 'Lithornithidae belongs to Palaeognathae'
- 'Loncornis belongs to Aves'
- 'Loncornis helveticus is recombined as Eleutherornis helveticus'
- 'Masillastega belongs to Sulidae'
- 'Masillastega rectirostris belongs to Masillastega'
- 'Mergus ronzoni is recombined as Prophalacrocorax ronzoni' according to Harrison 1975
- 'Mergus ronzoni is recombined as Prophalacrocorax ronzoni'
- 'Mergus ronzoni belongs to Mergus' according to Gervais 1849
- 'Mergus ronzoni is recombined as Sula ronzoni' according to Milne-Edwards 1861
- 'Neoaves belongs to Neognathae'
- 'Neognathae was reranked as a unranked clade and belongs to Neornithes'
- 'Pachydyptes belongs to Spheniscidae'
- 'Pachydyptes novaezealandiae is recombined as Platydyptes novaezealandiae'
- 'Pachydyptes ponderosus belongs to Pachydyptes'
- 'Palaeeudyptes belongs to Sphenisciformes'
- 'Palaeeudyptes antarcticus belongs to Palaeeudyptes'
- 'Palaeeudyptes marplesi belongs to Palaeeudyptes'
- 'Palaeognathae was reranked as a superorder and belongs to Neornithes'
- 'Palaeotididae belongs to Palaeognathae'
- 'Palaeotis belongs to Palaeotididae'
- 'Palaeotis weigelti belongs to Palaeotis'
- 'Paracathartes belongs to Lithornithidae'
- 'Paraortygoides belongs to Gallinuloididae'
- 'Paraortygoides messelensis belongs to Paraortygoides'
- 'Paraortygoides radagasti belongs to Paraortygoides' according to Dyke and Gulas 2002
- 'Paraortygoides radagasti belongs to Paraortygoides'
- 'Pediorallus hookeri is recombined as Lithornis hookeri'
- 'Pediorallus nasi is recombined as Lithornis nasi'
- 'Phocavis belongs to Plotopteridae'
- 'Phocavis maritimus belongs to Phocavis'
- 'Piscator belongs to Phalacrocoracidae'
- 'Platydyptes belongs to Sphenisciformes'
- 'Platydyptes amiesi belongs to Platydyptes'
- 'Platydyptes marplesi belongs to Platydyptes'
- 'Prophalacrocorax belongs to Phalacrocoracidae' according to Harrison 1975
- 'Prophalacrocorax belongs to Sulidae'
- 'Protoplotus belongs to Protoplotidae'
- 'Protoplotus beauforti belongs to Protoplotus'
- 'Pseudocrypturus belongs to Lithornithidae'
- 'Pseudocrypturus cercanaxius belongs to Pseudocrypturus'
- 'Remiornis heberti belongs to Remiornis'
- 'Remiornithidae belongs to Palaeognathae'
- 'Rheidae belongs to Palaeognathae'
- 'Stromeria is a subjective synonym of Eremopezus'
- 'Stromeria fajumensis is a subjective synonym of Eremopezus eocaenus'
- 'Sula arvernensis is recombined as Empheresula arvernensis'
- 'Taoperdix belongs to Paraortygidae'
- 'Tetrao pessieti is recombined as Taoperdix pessieti'
- 'Tonsala belongs to Plotopteridae'
- 'Tonsala hildegardae belongs to Tonsala'
- 'Waimanu belongs to Sphenisciformes'
- 'Waimanu manneringi belongs to Waimanu'
- 'Waimanu tuatahi belongs to Waimanu'