Spirolegoceras harkeri (Ruzhentsev, 1961) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Cephalopoda order Goniatitida family Spirolegoceratidae genus Sverdrupites species Sverdrupites harkeri Name Homonyms Spirolegoceras harkeri (Ruzhentsev, 1961)