Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Superfamily †Bellerophontoidea McCoy, 1852, incertae sedis
     1 Family †Bellerophontidae McCoy, 1852
     2 Family †Bucanellidae Koken, 1925
     3 Family †Bucaniidae Ulrich & Scofield, 1897
     4 Family †Euphemitidae Knight, 1956
     5 Family †Pterothecidae Fischer, 1883
     6 Family †Sinuitidae Dall, 1913
     7 Family †Tremanotidae Naef, 1913
     8 Family †Tropidodiscidae Knight, 1956