? gregoryi Spath, 1922 Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Chromista phylum Ochrophyta class Bacillariophyceae order Chaetocerotales family Acanthocerataceae genus Mortoniceras species Mortoniceras gregoryi Name Homonyms ? gregoryi Spath, 1922 ? gregoryi Weir, 1929 ? gregoryi Frick, 1926 ? gregoryi Loomis, 1924 ? gregoryi White, 1925 ? gregoryi Clark & Twitchell, 1915 ? gregoryi Clark & Twitchell, 1915