Between brackets is the number of accepted species

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- Mollusca (133 221)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 077)
- Subclass Autobranchia (23 354)
- Infraclass Heteroconchia (16 679)
- Subterclass Archiheterodonta (1 210)
- Subterclass Euheterodonta (11 394)
- Superorder Anomalodesmata (990)
- Superorder Imparidentia (10 371)
- Order Adapedonta (263)
- Order Cardiida (3 058)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Order Hiatellida represented as Adapedonta
- Order Hippuritida † (322)
- Suborder Hippuritidina † (255)
- Superfamily Caprinoidea A. d'Orbigny, 1847 † (51)
- Superfamily Hippuritacea accepted as Radiolitoidea A. d'Orbigny, 1847 †
- Superfamily Radiolitoidea A. d'Orbigny, 1847 † (196)
- Family Caprinulidae Yanin, 1990 † (6)
- Family Caprotinidae J. E. Gray, 1848 † (13)
- Family Diceratidae Dall, 1895 † (28)
- Family Hippuritidae Gray, 1848 † (17)
- Genus Barrettia S. P. Woodward, 1862 † (1)
- Genus Batolites Montfort, 1808 † accepted as Hippurites Lamarck, 1801 †
- Genus Carribea Grubić, 2004 †
- Genus Dorbignia S. P. Woodward, 1862 † accepted as Hippurites Lamarck, 1801 †
- Genus Dorbignya [sic] † accepted as Dorbignia S. P. Woodward, 1862 †
- Genus Gloria Grubić, 2004 †
- Genus Hippuritella Douvillé, 1908 † (4)
- Genus Hippurites Lamarck, 1801 † (1)
- Genus Hyppurites [sic] † accepted as Hippurites Lamarck, 1801 †
- Genus Laluzia Götz & Mitchell, 2009 †
- Genus Orbignya [sic] † accepted as Dorbignia S. P. Woodward, 1862 †
- Genus Parastroma Douvillé, 1926 † (2)
- Genus Pironaea Meneghini, 1868 † (5)
- Subgenus Pironaea (Vaccinites) P. Fischer, 1887 † accepted as Vaccinites P. Fischer, 1887 †
- Species Pironaea (Vaccinites) polystylus (Pirona, 1868) † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea bacevicensis (Milovanović, 1960) † accepted as Pironaea milovanovici Kühn, 1935 †
- Species Pironaea branislavi Sladić-Trifunović, 1978 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea buseri Pejović, 1996 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea corrugata (S. P. Woodward, 1855) †
- Species Pironaea fruscagorensis Milovanović, Sladić-Trifunović & Grubić, 1970 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea lisansis Pamouktchiev, 1975 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea machnitschi Wiontzek, 1934 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea milovanovici Kühn, 1935 †
- Species Pironaea negrichorensis Pamouktchiev, 1975 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea pejovici Pamouktchiev, 1975 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea persica Vredenburg, 1909 †
- Species Pironaea petkovici Milovanović, Sladić-Trifunović & Grubić, 1970 † accepted as Pironaea milovanovici Kühn, 1935 †
- Species Pironaea polystyla (Pirona, 1868) †
- Species Pironaea postdalmatinica Pamouktchiev, 1979 † accepted as Pironaea milovanovici Kühn, 1935 †
- Species Pironaea praeslavonica Milovanović, Sladić-Trifunović & Grubić, 1970 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea praeyaroslavensis Pamouktchiev, 1975 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea signumpraeverta Pamouktchiev, 1979 † accepted as Pironaea milovanovici Kühn, 1935 †
- Species Pironaea sladici Pamouktchiev, 1975 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea slavonica Hilber, 1902 † accepted as Pironaea polystyla (Pirona, 1868) †
- Species Pironaea syriaca Vautrin, 1933 †
- Species Pironaea timacensis Milovanović, 1956 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea udinensis Pamouktchiev, 1975 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Species Pironaea yaroslavensis Pamouktchiev, 1975 † accepted as Pironaea transitoria (Milovanović, 1934) †
- Genus Pironea Meneghini, 1868 † represented as Pironaea Meneghini, 1868 †
- Genus Praebarrettia Trechmann, 1924 †
- Genus Praetorreites Philip & Platel, 1994 †
- Genus Pseudobarrettia Müllerried, 1931 † accepted as Barrettia S. P. Woodward, 1862 †
- Genus Pseudovaccinites Sénesse, 1946 †
- Genus Rhedensia Sénesse, 1939 † accepted as Vaccinites P. Fischer, 1887 †
- Genus Tetracionites Astre, 1931 † (1)
- Genus Tetravaccinites Bilotte, 1981 † accepted as Vaccinites P. Fischer, 1887 †
- Genus Torreites R. H. Palmer, 1933 † (1)
- Genus Ugarella Polsak & Slišković, 1987 † accepted as Hippurites Lamarck, 1801 †
- Genus Vaccinites P. Fischer, 1887 † (1)
- Genus Whitfieldiella Mitchell, 2010 † (1)
- Genus Yvaniella Milovanović, 1938 †
- Family Monopleuridae Munier-Chalmas, 1873 † (32)
- Family Plagioptychidae Douvillé, 1888 † (17)
- Family Polyconitidae MacGillavry, 1937 † (6)
- Family Radiolitidae A. d'Orbigny, 1847 † (74)
- Family Trechmannellidae L. R. Cox, 1934 † (3)
- Genus Anodontopleura Felix, 1891 † (1)
- Genus Baryconites R. H. Palmer, 1928 † (1)
- Genus Cryptaulia Počta, 1889 † (3)
- Genus Dessia Pamouktchiev, 1983 † (1)
- Genus Lithocalamus Lupher & E. L. Packard, 1929 † (1)
- Genus Palus R. H. Palmer, 1928 † (1)
- Genus Rousselia Douvillé, 1898 †
- Genus Sabinia Parona, 1908 †
- Genus Somalites Pamouktchiev, 1983 †
- Suborder Requieniidina † (67)
- Order Lucinida (998)
- Order Megalodontida † (141)
- Order Modiomorphida † (95)
- Order Myacea accepted as Myida
- Order Myida (925)
- Order Sphaeriida (662)
- Order Venerida (2 827)
- Superfamily Cyamioidea G. O. Sars, 1878 (98)
- Superfamily Gaimardioidea Hedley, 1916 accepted as Cyamioidea G. O. Sars, 1878
- Superfamily Galeommatacea accepted as Galeommatoidea J. E. Gray, 1840
- Superfamily Grammysioidea S. A. Miller, 1877 † (102)
- Superfamily Kalenteroidea Marwick, 1953 † (46)
- Superfamily Mactracea accepted as Mactroidea Lamarck, 1809
- Order Anomalodesmacea accepted as Anomalodesmata
- Order Euheterodonta incertae sedis (27)
- Order Pholadomyida represented as Anomalodesmata
- Family Lipanellidae T. M. Sánchez, 2005 † (4)
- Family Rhaetidiidae Dominici & Danise, 2024 † (2)
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (4 074)
- Superorder Heteroconchia incertae sedis † (1)
- Infraclass Pteriomorphia (6 675)
- Subclass Bivalvia incertae sedis (7)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Paleoheterodonta accepted as Palaeoheterodonta
- Subclass Protobranchia (1 374)
- Infraclass Cryptodonta † (342)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 971)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata