Between brackets is the number of accepted species
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- Mollusca (133 306)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 047)
- Subclass Amphigastropoda † (434)
- Suborder Liljevallospiroidei † accepted as Bellerophontoidea F. McCoy, 1852 †
- Superfamily Bellerophontoidea F. McCoy, 1852 † (434)
- Family Bellerophontidae McCoy, 1852 † (246)
- Family Bellerophontoidea incertae sedis † (5)
- Family Bucanellidae Koken, 1925 † (10)
- Family Bucaniidae Ulrich & Scofield, 1897 † (87)
- Family Cymbulariidae Horný, 1963 † accepted as Cymbulariinae Horný, 1963 †
- Family Euphemitidae Knight, 1956 † (35)
- Family Grandostomatidae Horný, 1962 † accepted as Bucaniinae Ulrich & Scofield, 1897 †
- Family Liljevallospiridae Golikov & Starobogatov, 1989 † accepted as Bellerophontidae McCoy, 1852 †
- Family Protowarthiidae Ulrich & Scofield, 1897 † accepted as Sinuitinae Dall, 1913 †
- Family Pterothecidae P. Fischer, 1883 † (5)
- Family Sinuitidae Dall, 1913 † (18)
- Subfamily Aiptospirinae X.-J. Wang, 1980 †
- Subfamily Hispanosinuitinae Frýda & Gutierrez-Marco, 1996 † (1)
- Genus Hispanosinuites Frýda & Gutierrez-Marco, 1996 † (1)
- Subfamily Sinuitinae Dall, 1913 † (11)
- Genus Cyrtodiscus Perner, 1903 † (4)
- Genus Gamadiscus Horný, 1962 † accepted as Cyrtodiscus Perner, 1903 †
- Genus Modestospira Yochelson, 1964 † (1)
- Genus Selesinuites Horný, 1997 † (1)
- Genus Strangulites Horný, 1962 † accepted as Sinuites Koken, 1896 †
- Family Tremanotidae Naef, 1913 † (3)
- Family Tropidodiscidae Knight, 1956 † (25)
- Subfamily Bucanellinae Koken, 1925 † accepted as Bucanellidae Koken, 1925 †
- Subfamily Euphemitinae Knight, 1956 † accepted as Euphemitidae Knight, 1956 †
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 850)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 231)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
