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 Acochlidioidea Küthe, 1935 [monotypic] see Order Acochlidia Odhner, 1937
         Superfamily Euacochlidioidea nom. inval.
           Family Hedylopsidae Odhner, 1952
             Genus Hedylopsis Thiele, 1931
               1 Subgenus Pseudunela Salvini-Plawen, 1973 see Genus Pseudunela Salvini-Plawen, 1973