†order Gastornithiformes Stejneger 1885 (bird)
Parent taxon: Galloanseres according to T. H. Worthy and J. M. T. Nguyen 2020
See also Bourdon et al. 2014, Martin 1992 and Worthy et al. 2017
Sister taxa: Galloanserimorphae, Sylviornithidae, Vegaviiformes
Subtaxa: Dromornithes Gastornithes
Ecology: volant herbivore