Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Orthogastropoda Ponder & Lindberg, 1995 Superorder Heterobranchia Burmeister, 1837 Order Heterostropha Fischer, 1885 Superfamily Architectonicoidea Gray, 1850 1 Family Architectonicidae Gray, 1850 2 Family Mathildidae Dall, 1889