Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Order Neogastropoda (23 716)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 674)
- Family Acusidae J. E. Gray, 1853 accepted as Terebridae Mörch, 1852
- Family Borsoniidae Bellardi, 1875 (571)
- Family Bouchetispiridae Kantor, E. E. Strong & Puillandre, 2012 (2)
- Family Clathurellidae H. Adams & A. Adams, 1858 (334)
- Family Clavatulidae J. E. Gray, 1853 (438)
- Family Clavidae T. L. Casey, 1904 accepted as Drilliidae Olsson, 1964
- Family Clionellidae W. Stimpson, 1865 accepted as Clavatulidae J. E. Gray, 1853
- Family Cochlespiridae A. W. B. Powell, 1942 (114)
- Family Conidae J. Fleming, 1822 (1 393)
- Family Conilithidae J. K. Tucker & M. Tenorio, 2009 accepted as Conidae J. Fleming, 1822
- Family Conoidea incertae sedis (318)
- Family Conorbidae De Gregorio, 1880 (19)
- Family Conusidae J. Fleming, 1822 accepted as Conidae J. Fleming, 1822
- Family Cryptoconidae Cossmann, 1896 † (22)
- Family Drilliidae Olsson, 1964 (769)
- Family Fusiturridae Abdelkrim, Aznar-Cormano, Fedosov, Kantor, Lozouet, Phuong, Zaharias & Puillandre, 2018 (19)
- Family Horaiclavidae Bouchet, Kantor, Sysoev & Puillandre, 2011 (315)
- Family Mangeliidae P. Fischer, 1883 (1 064)
- Family Marshallenidae Abdelkrim, Aznar-Cormano, Fedosov, Kantor, Lozouet, Phuong, Zaharias & Puillandre, 2018 (5)
- Family Melatomidae Gill, 1871 accepted as Clavatulidae J. E. Gray, 1853
- Family Mitrolumnidae Sacco, 1904 accepted as Mitromorphidae T. L. Casey, 1904
- Family Mitromorphidae T. L. Casey, 1904 (219)
- Genus Anarithma Iredale, 1916 (25)
- Genus Arielia Shasky, 1961 (2)
- Genus Ariella [sic] accepted as Arielia Shasky, 1961
- Genus Citharopsis Pease, 1868 accepted as Anarithma Iredale, 1916
- Genus Clinomitra Bellardi, 1889 † accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Cymakra J. A. Gardner, 1938 (3)
- Genus Diptychomitra Bellardi, 1888 † accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Helenella T. L. Casey, 1904 accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Itia Marwick, 1931 † (1)
- Genus Lovellona Iredale, 1917 (6)
- Genus Maorimorpha A. W. B. Powell, 1939 (3)
- Genus Minipyrene Coomans, 1967 accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Mitramorpha [sic] accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Mitrellatoma A. W. B. Powell, 1942 † (1)
- Genus Mitrithara Hedley, 1922 accepted as Mitromorpha P. P. Carpenter, 1865
- Genus Mitrolumna Bucquoy, Dautzenberg & Dollfus, 1883 accepted as Mitromorpha (Mitrolumna) Bucquoy, Dautzenberg & Dollfus, 1883 (10)
- Subgenus Mitrolumna (Purulana) K. Martin, 1931 accepted as Mitromorpha P. P. Carpenter, 1865
- Species Mitrolumna algeriana Pallary, 1900 accepted as Mitromorpha columbellaria (Scacchi, 1836)
- Species Mitrolumna aptycha (O. Boettger, 1906) †
- Species Mitrolumna aquitanica Peyrot, 1928 † accepted as Perplicaria aquitanica (Peyrot, 1928) †
- Species Mitrolumna atypica Lozouet, 2015 †
- Species Mitrolumna bartoniana Boussac, 1911 †
- Species Mitrolumna biplicata (Dall, 1889) accepted as Mitromorpha biplicata Dall, 1889
- Species Mitrolumna canaliculata (Bellardi, 1888) †
- Species Mitrolumna clathrata (Bellardi, 1888) †
- Species Mitrolumna commutabilis (E. A. Smith, 1890) accepted as Mitromorpha commutabilis (E. A. Smith, 1890)
- Species Mitrolumna crenipicta Dautzenberg, 1889 accepted as Mitromorpha crenipicta (Dautzenberg, 1889)
- Species Mitrolumna cubana Espinosa & Ortea, 2013 accepted as Mitromorpha cubana (Espinosa & Ortea, 2013)
- Species Mitrolumna dalli (Dautzenberg & H. Fischer, 1896) accepted as Mitromorpha dalli Dautzenberg & H. Fischer, 1896
- Species Mitrolumna erycinella Espinosa & Ortea, 2009 accepted as Mitromorpha erycinella (Espinosa & Ortea, 2009)
- Species Mitrolumna granulosa Locard, 1886 accepted as Mitromorpha columbellaria (Scacchi, 1836)
- Species Mitrolumna granum (Marwick, 1928) † accepted as Mitromorpha granum (Marwick, 1928) †
- Species Mitrolumna haycocki (Dall & Bartsch, 1911) accepted as Mitromorpha haycocki (Dall & Bartsch, 1911)
- Species Mitrolumna hortiensis Lozouet, 1999 †
- Species Mitrolumna iki Kay, 1979 accepted as Mitromorpha iki (Kay, 1979)
- Species Mitrolumna keenae W. K. Emerson & Radwin, 1969 accepted as Mitromorpha keenae (W. K. Emerson & Radwin, 1969)
- Species Mitrolumna major Locard, 1886 accepted as Mitromorpha columbellaria (Scacchi, 1836)
- Species Mitrolumna melitensis Mifsud, 1993 accepted as Mitromorpha olivoidea (Cantraine, 1835)
- Species Mitrolumna oligomiocenica Lozouet, 2015 †
- Species Mitrolumna oliviformis Locard, 1891 accepted as Mitromorpha olivoidea (Cantraine, 1835)
- Species Mitrolumna olivoidea (Cantraine, 1835) accepted as Mitromorpha olivoidea (Cantraine, 1835)
- Species Mitrolumna olivoidea (Cantraine, 1835) sensu Bucquoy, Dautzenberg & Dollfus, 1883 accepted as Mitromorpha columbellaria (Scacchi, 1836)
- Species Mitrolumna peyroti Lozouet, 2015 †
- Species Mitrolumna pleurotomoides (E. A. Smith, 1890) accepted as Mitromorpha pleurotomoides (E. A. Smith, 1890)
- Species Mitrolumna popeae Faber, 2006 accepted as Mitromorpha popeae (Faber, 2006)
- Species Mitrolumna raulini Peyrot, 1928 †
- Species Mitrolumna salisburyi Cernohorsky, 1978 accepted as Mitromorpha salisburyi (Cernohorsky, 1978)
- Species Mitrolumna saotomensis Rolán & F. Boyer, 2001 accepted as Mitromorpha saotomensis (Rolán & F. Boyer, 2001)
- Species Mitrolumna selene Espinosa & Ortea, 2009 accepted as Mitromorpha selene (Espinosa & Ortea, 2009)
- Species Mitrolumna senegalensis Rolán & F. Boyer, 2001 accepted as Mitromorpha senegalensis (Rolán & F. Boyer, 2001)
- Species Mitrolumna smithi (Dautzenberg & H. Fischer, 1896) accepted as Mitromorpha smithi Dautzenberg & H. Fischer, 1896
- Species Mitrolumna stepheni (Melvill & Standen, 1897) accepted as Anarithma stepheni (Melvill & Standen, 1897)
- Species Mitrolumna titanocola Lozouet, 1999 †
- Species Mitrolumna torticula (Dall, 1889) accepted as Mitromorpha torticula (Dall, 1889)
- Species Mitrolumna undulata (Dall, 1927) accepted as Mitromorpha undulata Dall, 1927
- Species Mitrolumna usta (E. A. Smith, 1890) accepted as Mitromorpha usta (E. A. Smith, 1890)
- Species Mitrolumna ventriosa Lozouet, 2015 †
- Species Mitrolumna wilhelminae van Aartsen, Menkhorst & E. Gittenberger, 1984 accepted as Mitromorpha wilhelminae (van Aartsen, Menkhorst & E. Gittenberger, 1984)
- Genus Mitromorpha P. P. Carpenter, 1865 (151)
- Genus Mitromorphidae incertae sedis
- Genus Scrinium Hedley, 1922 (17)
- Genus Vexiariella Shuto, 1983 accepted as Arielia Shasky, 1961
- Family Pervicaciidae Rudman, 1969 accepted as Terebridae Mörch, 1852
- Family Pleurotomidae J. E. Gray, 1838 accepted as Turridae H. Adams & A. Adams, 1853 (1838)
- Family Pseudomelatomidae J. P. E. Morrison, 1966 (781)
- Family Raphitomidae Bellardi, 1875 (1 158)
- Family Strictispiridae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- Family Taranteconidae J. K. Tucker & M. Tenorio, 2009 accepted as Conidae J. Fleming, 1822
- Family Terebridae Mörch, 1852 (750)
- Family Thatcheriidae A. W. B. Powell, 1942 accepted as Raphitomidae Bellardi, 1875
- Family Turridae H. Adams & A. Adams, 1853 (1838) (383)
- Subfamily Andoniinae Vera-Peláez, 2002 † accepted as Raphitomidae Bellardi, 1875
- Subfamily Crassispirinae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- Subfamily Cytharinae Thiele, 1929 accepted as Mangeliidae P. Fischer, 1883
- Subfamily Daphnellinae T. L. Casey, 1904 accepted as Raphitomidae Bellardi, 1875
- Subfamily Diptychomitrinae Bellardi, 1888 accepted as Mitromorphidae T. L. Casey, 1904
- Subfamily Oenopotinae Bogdanov, 1987 accepted as Mangeliidae P. Fischer, 1883
- Subfamily Pleurotomellinae F. Nordsieck, 1968 accepted as Raphitomidae Bellardi, 1875
- Subfamily Pseudotominae Bellardi, 1875 accepted as Borsoniidae Bellardi, 1875
- Subfamily Pusionellinae J. E. Gray, 1853 accepted as Clavatulidae J. E. Gray, 1853
- Subfamily Taraninae T. L. Casey, 1904 accepted as Raphitomidae Bellardi, 1875
- Subfamily Turriculinae A. W. B. Powell, 1942 accepted as Clavatulidae J. E. Gray, 1853
- Subfamily Zemaciinae Sysoev, 2003 accepted as Borsoniidae Bellardi, 1875
- Subfamily Zonulispirinae J. H. McLean, 1971 accepted as Pseudomelatomidae J. P. E. Morrison, 1966
- Superfamily Mitroidea Swainson, 1831 (633)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 940)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (55)
- Superfamily Pseudolivoidea De Gregorio, 1880 accepted as Olivoidea Latreille, 1825
- Superfamily Pyrifusoidea Bandel & Dockery, 2001 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Sarganoidea Stephenson, 1923 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Toxoglossa Troschel, 1848 accepted as Conoidea J. Fleming, 1822
- Superfamily Turbinelloidea Swainson, 1835 (1 252)
- Superfamily Volutoidea Rafinesque, 1815 (3 873)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- 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 (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata