Siphonaria stewartiana (Powell, 1939) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Gastropoda order Siphonariida family Siphonariidae genus Siphonaria species Siphonaria stewartiana Name Synonyms Kerguelenella stewartiana (Powell, 1939) Kerguelenia stewartiana Powell, 1939 Homonyms Siphonaria stewartiana (Powell, 1939)