Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
     Clade Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
       Informal Group Opisthobranchia Milne-Edwards, 1846 see Order Opisthobranchia Milne-Edwards, 1848
         Clade Umbraculida Schmekel, 1985 see Order Umbraculida Schmekel, 1985
           Superfamily Umbraculoidea Dall, 1889 (1827)
             1 Family Umbraculidae Dall, 1889 (1827)
             2 Family Tylodinidae Gray, 1847