Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Orthogastropoda Ponder & Lindberg, 1995 Superorder "hot vent taxa" Ponder & Lindberg, 1997 see Superorder Vetigastropoda Salvini-Plawen, 1980 1 Order Neomphaolida see Order Neomphalida Sitnikova & Starobogatov, 1983