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)
- Superfamily Mitroidea Swainson, 1831 (633)
- Family Charitodoronidae Fedosov, Herrmann, Kantor & Bouchet, 2018 (14)
- Family Mitridae Swainson, 1831 (596)
- Subfamily Cylindromitrinae Cossmann, 1899 (59)
- Subfamily Imbricariinae Troschel, 1867 (136)
- Subfamily Isarinae Fedosov, Herrmann, Kantor & Bouchet, 2018 (54)
- Subfamily Mitridae incertae sedis (28)
- Subfamily Mitrinae Swainson, 1831 (271)
- Genus Acromargarita S.-I Huang, 2021 (10)
- Genus Calcimitra S.-I Huang, 2011 (26)
- Species Calcimitra arnoldeyasi (Poppe, Tagaro & R. Salisbury, 2010)
- Species Calcimitra bellardii (R. Hoernes & Auinger, 1880) †
- Species Calcimitra brinkae (R. Salisbury & Kilburn, 1996)
- Species Calcimitra brunetta (Chino & Herrmann, 2015)
- Species Calcimitra chiangfucius (S.-I Huang & R. Salisbury, 2017)
- Species Calcimitra christinae (Poppe, 2008)
- Species Calcimitra chuoi (S.-I Huang & R. Salisbury, 2017) accepted as Cancillopsis chuoi (S.-I Huang & R. Salisbury, 2017)
- Species Calcimitra glaphyria (H. Turner, 2001)
- Species Calcimitra hilli (Cernohorsky, 1976)
- Species Calcimitra invicta (S.-I Huang & R. Salisbury, 2017)
- Species Calcimitra kingtsio S.-I Huang, 2011
- Species Calcimitra labecula (Herrmann & Dekkers, 2009)
- Species Calcimitra lussii (H. Turner & R. Salisbury, 2007)
- Species Calcimitra marrowi (H. Turner, 2001)
- Species Calcimitra meyeriana (R. Salisbury, 1992)
- Species Calcimitra moerchii (A. Adams, 1855)
- Species Calcimitra philippeboucheti Thach, 2020
- Species Calcimitra philosopha (S.-I Huang & R. Salisbury, 2017)
- Species Calcimitra poppei (E. Guillot de Suduiraut, 2000)
- Species Calcimitra salva (H. Turner, 2001)
- Species Calcimitra soela Marrow, 2020
- Species Calcimitra subflava (Kuroda & T. Habe, 1971)
- Species Calcimitra taiwanbale (S.-I Huang & R. Salisbury, 2017)
- Species Calcimitra toi S.-I Huang & Q.-Y. Chuo, 2019
- Species Calcimitra triplicata (E. von Martens, 1904)
- Species Calcimitra verweyi (Knudsen, 1970)
- Species Calcimitra wuhuai S.-I Huang & Q.-Y. Chuo, 2019
- Genus Cancillopsis Fedosov, Herrmann, Kantor & Bouchet, 2018 (4)
- Genus Dentimitra Koenen, 1890 † (2)
- Genus Dibaphus R. A. Philippi, 1847 accepted as Nebularia Swainson, 1840
- Genus Diplomitra Finlay, 1926 † accepted as Eumitra Tate, 1889
- Genus Domiporta Cernohorsky, 1970 (22)
- Genus Episcomitra Monterosato, 1917 (32)
- Genus Eumitra Tate, 1889 (13)
- Genus Fraudiziba Harzhauser & Landau, 2021 † (9)
- Genus Fusidomiporta Fedosov, Herrmann, Kantor & Bouchet, 2018 (2)
- Genus Gemmulimitra Fedosov, Herrmann, Kantor & Bouchet, 2018 (14)
- Genus Mitra Lamarck, 1798 (40)
- Genus Mitraria Rafinesque, 1815 accepted as Mitra Lamarck, 1798
- Genus Neotiara Fedosov, Herrmann, Kantor & Bouchet, 2018 (9)
- Genus Profundimitra Fedosov, Herrmann, Kantor & Bouchet, 2018 (7)
- Genus Pseudonebularia Fedosov, Herrmann, Kantor & Bouchet, 2018 (34)
- Genus Quasimitra Fedosov, Herrmann, Kantor & Bouchet, 2018 (31)
- Genus Roseomitra Fedosov, Herrmann, Kantor & Bouchet, 2018 (11)
- Genus Tiarella Swainson, 1840 accepted as Mitra Lamarck, 1798
- Genus Ziba H. Adams & A. Adams, 1853 (5)
- Subfamily Pleioptygmatinae Quinn, 1989 (3)
- Subfamily Strigatellinae Troschel, 1869 (43)
- Genus Butonina Beets, 1942 † (1)
- Genus Plochelaea Gabb, 1873 † (1)
- Family Pleioptygmatidae Quinn, 1989 accepted as Pleioptygmatinae Quinn, 1989
- Family Pyramimitridae Cossmann, 1901 (23)
- 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