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
         1.1 Clione limacina (Phipps, 1774)
         1.2.1 Pleurocera vestitum (Conrad, 1834)
         1.2.2 Littorina littorea (C. Linnaeus, 1758) - common periwinkle
         2 Mainwaringia rhizophila Reid, 1986