Archaeohippus penultimus (Matthew, 1924) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata class Mammalia order Perissodactyla family Equidae genus Archaeohippus species Archaeohippus penultimus Name Synonyms Parahippus penultimus (Matthew, 1924) Homonyms Archaeohippus penultimus (Matthew, 1924)