Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       Order Anaspidea Fischer, 1883 - sea hares
         Superfamily Aplysioidea Lamarck, 1809
           1 Family Akeridae Mazzarelli, 1891 [monotypic]
           2 Family Aplysiidae Lamarck, 1809
           3 Family Dolabriferidae Pilsbry, 1895 see Subfamily Dolabriferinae Pilsbry, 1895
           4 Family Notarchidae see Subfamily Notarchinae Mazzarelli, 1893