Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758 Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795 Clade Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837 Informal Group "Lower Heterobranchia" Superfamily Acteonoidea d'Orbigny, 1843 Family †Acteonellidae Gill, 1871 Subfamily †Acteonellinae Gill, 1871