Opinions from H. M. F. Alvarenga and E. Holfing 2003
- 'Andalgalornis belongs to Patagornithinae'
- 'Andalgalornis ferox belongs to Andalgalornis' according to Patterson and Kraglievich 1960
- 'Andalgalornis ferox is a subjective synonym of Andalgalornis steulleti'
- 'Andrewsornis belongs to Patagornithinae'
- 'Andrewsornis abbotti belongs to Andrewsornis'
- 'Aucornis is a subjective synonym of Physornis'
- 'Aucornis euryrhyncus belongs to Aucornis' according to Ameghino 1898
- 'Aucornis euryrhyncus is a subjective synonym of Physornis fortis'
- 'Brontornis belongs to Brontornithinae'
- 'Brontornis burmeisteri belongs to Brontornis'
- 'Brontornis platyonyx is a subjective synonym of Brontornis burmeisteri'
- 'Brontornithidae was reranked as the subfamily Brontornithinae and belongs to Phorusrhacidae'
- 'Callornis is a subjective synonym of Phorusrhacos'
- 'Callornis giganteus is a subjective synonym of Phorusrhacos longissimus'
- 'Cariamae belongs to Ralliformes'
- 'Darwinornis is a subjective synonym of Phorusrhacos'
- 'Darwinornis copei is a subjective synonym of Phorusrhacos longissimus'
- 'Darwinornis socialis is a subjective synonym of Phorusrhacos longissimus'
- 'Darwinornis zitteli is a subjective synonym of Phorusrhacos longissimus'
- 'Darwinornithidae is a subjective synonym of Phorusrhacidae'
- 'Devincenzia belongs to Phorusrhacinae'
- 'Devincenzia gallinali belongs to Devincenzia' according to Kraglievich 1932
- 'Devincenzia gallinali is a subjective synonym of Devincenzia pozzi'
- 'Devincenziidae is a subjective synonym of Phorusrhacidae'
- 'Eucallornis is a subjective synonym of Phorusrhacos'
- 'Eucallornis giganteus belongs to Eucallornis' according to Ameghino 1901
- 'Eucallornis giganteus is a subjective synonym of Phorusrhacos longissimus'
- 'Hermosiorninae is a subjective synonym of Mesembriornithinae'
- 'Hermosiornis is a subjective synonym of Mesembriornis'
- 'Liornis is a subjective synonym of Phorusrhacos'
- 'Liornis floweri is a subjective synonym of Phorusrhacos longissimus'
- 'Liornis minor belongs to Liornis' according to Dolgopol de Saez 1927
- 'Liornis minor is a subjective synonym of Phorusrhacos longissimus'
- 'Mesembriorniidae is a subjective synonym of Phorusrhacidae'
- 'Mesembriornis belongs to Mesembriornithinae'
- 'Mesembriornis milneedwardsi belongs to Mesembriornis'
- 'Mesembriornis quatrefragesi is a subjective synonym of Phorusrhacos longissimus'
- 'Mesembriornis studeri is a subjective synonym of Phorusrhacos longissimus'
- 'Mesembriornithinae belongs to Phorusrhacidae'
- 'Morenomerceraria is a subjective synonym of Patagornis'
- 'Onactornis is a subjective synonym of Devincenzia'
- 'Onactornis depressus belongs to Onactornis' according to Cabrera 1939
- 'Onactornis depressus is a subjective synonym of Devincenzia pozzi'
- 'Owenornis is a subjective synonym of Phorusrhacos'
- 'Owenornis affinis is a subjective synonym of Phorusrhacos longissimus'
- 'Owenornis lydekkeri is a subjective synonym of Phorusrhacos longissimus'
- 'Palaeociconia is a subjective synonym of Mesembriornis'
- 'Palaeociconia cristata is a subjective synonym of Patagornis marshi'
- 'Palaeociconiinae is a subjective synonym of Patagornithinae'
- 'Paleopsilopterus belongs to Psilopterinae'
- 'Paleopsilopterus itaboraiensis belongs to Paleopsilopterus'
- 'Paraphysornis belongs to Brontornithinae'
- 'Patagornis belongs to Patagornithinae'
- 'Patagornis bachmanni is recombined as Psilopterus bachmanni'
- 'Patagornis lemoinei is recombined as Psilopterus lemoinei'
- 'Patagornis marshi belongs to Patagornis'
- 'Patagornithinae belongs to Phorusrhacidae'
- 'Pelecyorninae is a subjective synonym of Psilopterinae'
- 'Pelecyornis is a subjective synonym of Psilopterus'
- 'Pelecyornis pueyrredonensis belongs to Pelecyornis' according to Sinclair and Farr 1932
- 'Pelecyornis pueyrredonensis is a subjective synonym of Psilopterus bachmanni'
- 'Pelecyornis tubulatus is a subjective synonym of Psilopterus lemoinei'
- 'Phororhacoidea is an invalid subgroup of Cariamae'
- 'Phororhacos affinis is recombined as Psilopterus affinis'
- 'Phororhacos deautieri belongs to Phororhacos' according to Kraglievich 1931
- 'Phororhacos deautieri is a subjective synonym of Andalgalornis steulleti'
- 'Phororhacos delicatus belongs to Phororhacos' according to Amegino 1891
- 'Phororhacos delicatus is a subjective synonym of Psilopterus bachmanni'
- 'Phororhacos inflatus is a subjective synonym of Patagornis marshi'
- 'Phororhacos longissimus is recombined as Phorusrhacos longissimus'
- 'Phororhacos longissimus mendocinus belongs to Phororhacos longissimus' according to Kragkievich 1931
- 'Phororhacos longissimus mendocinus is recombined as Onactornis mendocinus' according to Brodkorb 1967
- 'Onactornis mendocinus is a subjective synonym of Devincenzia pozzi'
- 'Phororhacos modicus is a subjective synonym of Psilopterus lemoinei'
- 'Phororhacos platygnathus belongs to Phororhacos' according to Ameghino 1891
- 'Phororhacos platygnathus is a subjective synonym of Phorusrhacos longissimus'
- 'Phororhacos pozzi is recombined as Devincenzia pozzi'
- 'Phororhacos sehuensis is a subjective synonym of Phorusrhacos longissimus'
- 'Phororhacos steulleti is recombined as Andalgalornis steulleti'
- 'Phororhacosidae is corrected as Phorusrhacidae and belongs to Cariamae'
- 'Phorusrhacinae belongs to Phorusrhacidae'
- 'Phorusrhacos belongs to Phorusrhacinae'
- 'Physornis belongs to Brontornithinae'
- 'Physornis brasiliensis is recombined as Paraphysornis brasiliensis'
- 'Physornis fortis belongs to Physornis'
- 'Procariama belongs to Psilopterinae'
- 'Procariama simplex belongs to Procariama'
- 'Prophororhacinae is a subjective synonym of Mesembriornithinae'
- 'Prophororhacos is a subjective synonym of Mesembriornis'
- 'Prophororhacos incertus is recombined as Mesembriornis incertus'
- 'Psilopteridae was reranked as the subfamily Psilopterinae and belongs to Phorusrhacidae'
- 'Psilopterus belongs to Psilopterinae'
- 'Psilopterus australis is a subjective synonym of Psilopterus lemoinei'
- 'Psilopterus colzecus belongs to Psilopterus'
- 'Psilopterus communis is a subjective synonym of Psilopterus bachmanni'
- 'Psilopterus intermedius is a subjective synonym of Psilopterus bachmanni'
- 'Rostrornis is a subjective synonym of Brontornis'
- 'Rostrornis floweri is a subjective synonym of Brontornis burmeisteri'
- 'Staphylornis is a subjective synonym of Psilopterus'
- 'Staphylornis erythacus belongs to Staphylornis' according to Mercerat 1897
- 'Staphylornis erythacus is a subjective synonym of Psilopterus lemoinei'
- 'Staphylornis gallardoi is a subjective synonym of Psilopterus lemoinei'
- 'Stereornis is a subjective synonym of Phorusrhacos'
- 'Stereornis gaudryi is a subjective synonym of Phorusrhacos longissimus'
- 'Stereornis rollieri is a subjective synonym of Phorusrhacos longissimus'
- 'Titanis belongs to Phorusrhacinae'
- 'Titanis walleri belongs to Titanis'
- 'Titanornis is a subjective synonym of Phorusrhacos'
- 'Titanornis mirabilis is a subjective synonym of Phorusrhacos longissimus'
- 'Tolmodinae is a subjective synonym of Patagornithinae'
- 'Tomodus is a misspelling of Tolmodus'
- 'Tolmodus is a subjective synonym of Patagornis'
- 'Tolmodus inflatus belongs to Tolmodus' according to Ameghino 1891