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 Pyramidellidae Gray, 1840 Subfamily Pyramidellinae Gray, 1840 Genus Otopleura Fischer, 1885