Unio compressus Heude, 1877 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Bivalvia order Unionida family Unionidae genus Ptychorhynchus species Ptychorhynchus murinum Name Homonyms Unio compressus J.de C.Sowerby, 1828 Unio compressus Rafinesque, 1831