Opinions from F. Ameghino 1905
- 'Anthropornis belongs to Spheniscidae'
- 'Anthropornis nordenskjoldii belongs to Anthropornis'
- 'Apterodytes is replaced by Palaeoapterodytes'
- 'Apterodytes ictus is recombined as Palaeoapterodytes ictus'
- 'Argyrodyptes belongs to Spheniscidae'
- 'Argyrodyptes microtarsus belongs to Argyrodyptes'
- 'Arthrodytes belongs to Spheniscidae'
- 'Cladornidae belongs to Impennes'
- 'Cladornis belongs to Cladornidae'
- 'Cladornis pachypus belongs to Cladornis'
- 'Cruschedula belongs to Cladornidae'
- 'Cruschedula revola belongs to Cruschedula'
- 'Cruschedulidae is a subjective synonym of Cladornithidae'
- 'Delphinornis belongs to Spheniscidae'
- 'Delphinornis larsenii is corrected as Delphinornis larseni and belongs to Delphinornis'
- 'Eosphaeniscus [misspelled as Eospheniscus] belongs to Spheniscidae'
- 'Eosphaeniscus gunnari [misspelled as Eospheniscus gunnari] belongs to Eospheniscus'
- 'Ichtyopteryx belongs to Spheniscidae'
- 'Ichtyopteryx gracilis belongs to Ichtyopteryx'
- 'Isotremornis belongs to Spheniscidae'
- 'Isotremornis nordenskjoldi belongs to Isotremornis'
- 'Metancylornis belongs to Spheniscidae'
- 'Neculus belongs to Spheniscidae'
- 'Neculus rothi belongs to Neculus'
- 'Pachypteryx belongs to Spheniscidae'
- 'Pachypteryx grandis belongs to Pachypteryx'
- 'Palaeoapterodytes belongs to Spheniscidae'
- 'Palaeospheniscus belongs to Spheniscidae'
- 'Palaeospheniscus affinis belongs to Palaeospheniscus'
- 'Palaeospheniscus antarcticus is recombined as Paraptenodytes antarcticus'
- 'Palaeospheniscus bergi is recombined as Paraspheniscus bergi'
- 'Palaeospheniscus gracilis belongs to Palaeospheniscus'
- 'Palaeospheniscus intermedius belongs to Palaeospheniscus'
- 'Palaeospheniscus interruptus belongs to Palaeospheniscus'
- 'Palaeospheniscus medianus belongs to Palaeospheniscus'
- 'Palaeospheniscus menzbieri belongs to Palaeospheniscus'
- 'Palaeospheniscus nereius is recombined as Paraspheniscus nereius'
- 'Palaeospheniscus patagonicus belongs to Palaeospheniscus'
- 'Palaeospheniscus planus belongs to Palaeospheniscus'
- 'Palaeospheniscus robustus belongs to Palaeospheniscus'
- 'Palaeospheniscus rothi belongs to Palaeospheniscus'
- 'Paraptenodytes belongs to Spheniscidae'
- 'Paraptenodytes andrewsi is recombined as Arthrodytes andrewsi'
- 'Paraptenodytes curtus is recombined as Metancylornis curtus'
- 'Paraptenodytes grandis is recombined as Arthrodytes grandis'
- 'Perispheniscus belongs to Spheniscidae'
- 'Perispheniscus wimani belongs to Perispheniscus'
- 'Pseudospheniscus belongs to Spheniscidae'
- 'Pseudospheniscus concavus belongs to Pseudospheniscus'
- 'Pseudospheniscus interplanus belongs to Pseudospheniscus'
- 'Pseudospheniscus planus belongs to Pseudospheniscus'
- 'Spheniscidae belongs to Impennes'
- 'Treleudytes belongs to Spheniscidae'
- 'Treleudytes crassa belongs to Treleudytes'