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 Nudibranchia Cuvier, 1814 - "true" nudibranchs
         Suborder Doridina Odhner, 1934
           Superfamily Eudoridoidea Vaught, 1989, nom. inval. see Superfamily Doridoidea Rafinesque, 1815
             Family Halgerdidae Odhner, 1926 see Family Discodorididae Bergh, 1891
               1 Genus Halgerda Bergh, 1880
               2 Genus Aphelodoris Bergh, 1879
               3 Genus Asteronotus Ehrenberg, 1831