? altirostris Cope, 1873 Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Animalia phylum Chordata class Mammalia order Perissodactyla family Brontotheriidae Name Homonyms ? altirostris Leotaud, 1866 ? altirostris Hartert & Ejo, 1909 ? altirostris Cope, 1873