? robertsi Engel & Morris, 1983 Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Animalia phylum Arthropoda class Trilobita order Proetida family Phillipsiidae Name Homonyms ? robertsi Cook, 1998 ? robertsi Reed, 1906 ? robertsi Main & Mascord, 1974 ? robertsi Engel & Morris, 1983