Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
   Nudipleura Wägele & Willan, 2000
     Nudibranchia Cuvier, 1814 see Order Nudibranchia Cuvier, 1814
       Dexiarchia Schrödl, Wägele & Willan, 2001
         Cladobranchia Willan & Morton, 1984
           Aeolidoidea d'Orbigny, 1834 see Superfamily Aeolidioidea Gray, 1827
             Family Facelinidae Bergh, 1889
               Genus Cratena Bergh, 1864
                 1 Cratena peregrina (Gmelin, 1791)