? dubium Whitehouse, 1936 Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Animalia phylum Arthropoda class Trilobita order Agnostida family Ptychagnostidae genus Yakutiana species Yakutiana dubium Name Homonyms ? dubium Hauer, 1847 ? dubium Spath, 1935 ? dubium Münster, 1841 ? dubium Münster, 1841 ? dubium Noël, 1965 ? dubium Whitehouse, 1936 ? dubium Barrois, 1889 ? dubium Grunow ? dubium Cuvier, 1824 ? dubium Cooper, 1989 ? dubium Woodward, 1889 ? dubium Newberry, 1895 ? dubium Schumach.