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 "Lower Heterobranchia"
         Superfamily Mathildoidea Dall, 1889
           1 Family Mathildidae Dall, 1889
           2 Family †Ampezzanildidae Bandel, 1994
           3 Family †Anoptychiidae Bandel, 1994
           4 Family †Gordenellidae Gründel, 2000
           5 Family †Tofanellidae Bandel, 1995
           6 Family †Trachoecidae Bandel, 1994