Opinions from F. Ameghino 1894
- 'Ancylocoelus frequens belongs to Ancylocoelus'
- 'Asmodeus osborni belongs to Asmodeus'
- 'Asmodeus scotti belongs to Asmodeus'
- 'Astrapotherium voghti is a subjective synonym of Parastrapotherium ephebicum'
- 'Astrapotherium voghti belongs to Astrapotherium' according to Mercerat 1891
- 'Badiostes patagonicus belongs to Badiostes'
- 'Borhyaena antiqua belongs to Borhyaena'
- 'Brontornis platyonyx belongs to Brontornis'
- 'Caliphrium simplex belongs to Caliphrium'
- 'Callornis belongs to Phororhacidae'
- 'Callornis giganteus belongs to Callornis'
- 'Cladornidae belongs to Impennes'
- 'Cladornis pachypus belongs to Cladornis'
- 'Clorinda cliva belongs to Clorinda'
- 'Coniopternium andinum belongs to Coniopternium'
- 'Coresodon scalpridens belongs to Coresodon'
- 'Darwinornis is a subjective synonym of Phororhacos'
- 'Darwinornis copei is a subjective synonym of Phororhacos longissimus'
- 'Darwinornis socialis is a subjective synonym of Phororhacos sehuensis'
- 'Darwinornis zitteli is a subjective synonym of Phororhacos sehuensis'
- 'Deuterotherium distichum belongs to Deuterotherium'
- 'Dryornis is a subjective synonym of Phororhacos'
- 'Eoneornis australis belongs to Eoneornis'
- 'Eurygenium latirostris belongs to Eurygenium'
- 'Eutelornis patagonicus belongs to Eutelornis'
- 'Leontinia garzoni belongs to Leontinia'
- 'Leontinia gaudryi belongs to Leontinia'
- 'Leontinia lapidosa belongs to Leontinia'
- 'Liarthrus copei belongs to Liarthrus'
- 'Liornis belongs to Phororhacidae'
- 'Liornis floweri belongs to Liornis'
- 'Liptornis hesternus belongs to Liptornis'
- 'Loxocoelus carinatus belongs to Loxocoelus'
- 'Loxornis clivus belongs to Loxornis'
- 'Mesembriornis is a subjective synonym of Phororhacos'
- 'Mesembriornis quatrefagesi is a subjective synonym of Phororhacos sehuensis'
- 'Mesembriornis studeri is a subjective synonym of Phororhacos sehuensis'
- 'Octodontotherium grandae belongs to Octodontotherium'
- 'Orophodon hapaloides belongs to Orophodon'
- 'Owenornis is a subjective synonym of Phororhacos'
- 'Owenornis affinis is a subjective synonym of Phororhacos sehuensis'
- 'Owenornis lydekkeri is a subjective synonym of Phororhacos longissimus'
- 'Palaeociconia is a subjective synonym of Phororhacos'
- 'Palaeociconia cristata is a subjective synonym of Phororhacos inflatus'
- 'Palaeopeltidae belongs to Glyptodontia'
- 'Palaeopeltis inornatus belongs to Palaeopeltis'
- 'Palaeospheniscus antarcticus is recombined as Paraptenodytes antarcticus'
- 'Palaeospheniscus robustus belongs to Palaeospheniscus'
- 'Parastrapotherium cingulatum belongs to Parastrapotherium'
- 'Parastrapotherium holmbergi belongs to Parastrapotherium'
- 'Parastrapotherium lemoinei belongs to Parastrapotherium'
- 'Parastrapotherium trouessarti belongs to Parastrapotherium'
- 'Patagornis marshi is a subjective synonym of Phororhacos inflatus'
- 'Pelecyornis tubulatus belongs to Pelecyornis'
- 'Phororhacos inflatus belongs to Phororhacos' according to F. Ameghino 1891
- 'Phororhacos longissimus belongs to Phororhacos' according to F. Ameghino 1887
- 'Phororhacos modicus belongs to Phororhacos'
- 'Phororhacos sehuensis belongs to Phororhacos' according to F. Ameghino 1891
- 'Physornis fortis belongs to Physornis'
- 'Pleurocoelodon cingulatus belongs to Pleurocoelodon'
- 'Pleurocoelodon wingei belongs to Pleurocoelodon'
- 'Proadinotherium leptognathum belongs to Proadinotherium'
- 'Proedium solitarium belongs to Proedium'
- 'Pronesodon cristatus belongs to Pronesodon'
- 'Pronesodon robustus belongs to Pronesodon'
- 'Psilopterus is a subjective synonym of Pelecyornis'
- 'Psilopterus australis is recombined as Pelecyornis australis'
- 'Pyrotherium sorondoi belongs to Pyrotherium'
- 'Rodiotherium armatum belongs to Rodiotherium'
- 'Rostrornis floweri is a subjective synonym of Brontornis burmeisteri'
- 'Scaphops grypus belongs to Scaphops'
- 'Senodon platyarthrus belongs to Senodon'
- 'Stenogenium sclerops belongs to Stenogenium'
- 'Stephanornis is a subjective synonym of Phororhacos'
- 'Stereornis is a subjective synonym of Phororhacos'
- 'Stereornis gaudryi is a subjective synonym of Phororhacos longissimus'
- 'Stereornis rollieri is a subjective synonym of Phororhacos longissimus'
- 'Thegornis debilis belongs to Thegornis'
- 'Titanornis is a subjective synonym of Phororhacos'
- 'Titanornis mirabilis is a subjective synonym of Phororhacos longissimus'
- 'Titanornis mirabilis belongs to Titanornis' according to Mercerat 1893
- 'Traspoatherium convexidens belongs to Traspoatherium'
- 'Trimerostephanos scabrus belongs to Trimerostephanos'