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 Valvatoidea Gray, 1840 Family Valvatidae Gray, 1840 Genus Valvata Müller, 1774 Subgenus Atropidina Lindholm, 1906