Lystrosaurus declivis Brink, 1951 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata family Lystrosauridae genus Lystrosaurus species Lystrosaurus declivis Name Synonyms Dicynodon declivis Owen, 1860 Lystrosaurus primitivus Toerien, 1954 Lystrosaurus wagneri Van Hoepen, 1916 Ptychognathus alfredi Owen, 1862 Ptychognathus depressus Owen, 1876 Ptychosiagum declivis Lydekker, 1890 Homonyms Lystrosaurus declivis Brink, 1951