Leiostoma Swainson, 1840 Dataset GBIF Backbone Taxonomy Rank GENUS Published in Treat. Malac. , 191, 328. Classification kingdom Animalia phylum Mollusca class Gastropoda order Stylommatophora family Helicidae genus Leiostoma Name Homonyms Leiostoma (W.Mitten) Paris, 1897 Leiostoma Swainson, 1840 Leiostoma (Mitt.) Mitt.