Unio retortus Heude, 1883 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Bivalvia order Unionida family Unionidae genus Aculamprotula species Aculamprotula tortuosa Name Homonyms Unio retortus von Martens, 1875 Unio retortus Heude, 1883