Presbyornis pervetus Wetmore, 1926 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata class Aves order Anseriformes family Presbyornithidae genus Presbyornis species Presbyornis pervetus Name Synonyms Nautilornis avus Wetmore, 1926 Nautilornis proavitus Wetmore, 1926 Homonyms Presbyornis pervetus Wetmore, 1926