Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.
   Family Fissurellidae Fleming, 1822 - keyhole limpets
     Subfamily Fissurellinae Fleming, 1822
       Genus Diodora Gray, 1821
         Diodora italica (Defrance, 1820) - Italian keyhole limpet
         1 Diodora graeca (C. Linnaeus, 1758) - Graecian keyhole limpet
         2 Diodora cayenensis (Lamarck, 1822) - Cayenne keyhole limpet