Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795 Orthogastropoda Ponder & Lindberg, 1995 see Subclass Orthogastropoda Ponder & Lindberg, 1995 Apogastropoda Salvini-Plawen & Haszprunar, 1987 Caenogastropoda Cox, 1960 see Superorder Caenogastropoda Cox, 1960 Littorina littorea (C. Linnaeus, 1758) - common periwinkle