Phylum Mollusca Linnaeus, 1758 - molluscs Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837 Order Heterostropha Fischer, 1885 Superfamily Pyramidelloidea Gray, 1840 Family Ebalidae Warén, 1995 see Family Murchisonellidae Casey, 1904 Genus Murchisonella Mörch, 1875