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
         1 Suborder Doridina Odhner, 1934
         2 Suborder Dendronotina Odhner, 1934 [monotypic]
         3 Suborder Arminina Odhner, 1934
         4 Suborder Aeolidiina Eliot, 1910