Phylum Mollusca Linnaeus, 1758 - molluscs Subphylum Conchifera Gegenbauer, 1878 Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Orthogastropoda Ponder & Lindberg, 1995 Superorder Vetigastropoda Salvini-Plawen, 1980 see Order Vetigastropoda Salvini-Plawen, 1980 Superfamily Trochoidea Rafinesque, 1815 Family Trochidae Rafinesque, 1815 - top snails Subfamily Umboniinae Adams & Adams, 1854 (1840)