Opinions from O. C. Marsh 1880
- 'Apatornis belongs to Odontotormae'
- 'Archaeopteryx belongs to Saururae'
- 'Baptornis advenus belongs to Baptornis'
- 'Graculavus agilis is recombined as Ichthyornis agilis'
- 'Graculavus anceps is recombined as Ichthyornis anceps'
- 'Graculavus lentus is recombined as Ichthyornis lentus'
- 'Graculavus pumilus belongs to Graculavus'
- 'Graculavus velox belongs to Graculavus'
- 'Hesperornis belongs to Odontolcae'
- 'Hesperornis gracilis belongs to Hesperornis'
- 'Hesperornis gracilis belongs to Hesperornis' according to Marsh 1876
- 'Hesperornis regalis belongs to Hesperornis'
- 'Ichthyornis belongs to Odontotormae'
- 'Ichthyornis celer is recombined as Apatornis celer'
- 'Ichthyornis dispar belongs to Ichthyornis'
- 'Ichthyornis tener belongs to Ichthyornis'
- 'Ichthyornis validus belongs to Ichthyornis'
- 'Ichthyornis victor belongs to Ichthyornis' according to Marsh 1876
- 'Ichthyornis victor belongs to Ichthyornis'
- 'Laornis edvardsianus belongs to Laornis'
- 'Lestornis is a subjective synonym of Hesperornis'
- 'Lestornis crassipes belongs to Lestornis' according to Marsh 1876
- 'Lestornis crassipes is recombined as Hesperornis crassipes'
- 'Odontolcae belongs to Odontornithes'
- 'Odontotormae belongs to Odontornithes'
- 'Palaeotringa littoralis belongs to Palaeotringa'
- 'Palaeotringa vagans belongs to Palaeotringa'
- 'Palaeotringa vetus belongs to Palaeotringa' according to Marsh 1870
- 'Palaeotringa vetus belongs to Palaeotringa'
- 'Sauriurae [misspelled as Saururae] belongs to Odontornithes'
- 'Telmatornis affinis belongs to Telmatornis'
- 'Telmatornis priscus belongs to Telmatornis' according to Marsh 1870
- 'Telmatornis priscus belongs to Telmatornis'