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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)
Subclass Autobranchia (23 295)
Infraclass Heteroconchia (16 637)
Subterclass Archiheterodonta (1 208)
Subterclass Euheterodonta (11 356)
Superorder Anomalodesmata (987)
Superorder Imparidentia (10 336)
Order Adapedonta (260)
Order Cardiida (3 055)
Superfamily Anthracosioidea Amalitzky, 1892 † (215)
Superfamily Cardiacea accepted as Cardioidea Lamarck, 1809
Superfamily Cardioidea Lamarck, 1809 (1 536)
Family Adacnidae Gill, 1871 accepted as Adacnini Gill, 1871
Family Cardiidae Lamarck, 1809 (1 526)
Subfamily Cardiidae incertae sedis (18)
Subfamily Cardiinae Lamarck, 1809 (88)
Subfamily Cerastodermatinae F. Nordsieck, 1969 accepted as Cerastodermatini F. Nordsieck, 1969
Subfamily Clinocardiinae Kafanov, 1975 (17)
Subfamily Fraginae R. B. Stewart, 1930 (52)
Subfamily Goethemiinae M. Huber, 2010 accepted as Lymnocardiinae Stoliczka, 1870
Subfamily Hypaninae Starobogatov, 1970 accepted as Adacnini Gill, 1871
Subfamily Laevicardiinae Keen, 1951 (29)
Subfamily Lahilliinae H. J. Finlay & Marwick, 1937 † (11)
Subfamily Lymnocardiinae Stoliczka, 1870 (950)
Tribe Acanthocardiini Kafanov & Starobogatov, 1977 (32)
Tribe Acobaecardiini Paramonova, 1980 † (2)
Tribe Adacnini Gill, 1871 (153)
Genus Adachna [sic] accepted as Adacna Eichwald, 1838
Genus Adacna Eichwald, 1838 (7)
Genus Apscheronia Andrusov, 1903 † (3)
Genus Caspicardium Astaf'yeva, 1955 † (1)
Genus Didacna Eichwald, 1838 (85)
Subgenus Didacna (Crassadacna) Eberzin, 1962 † accepted as Pontalmyra Stefanescu, 1896 †
Subgenus Didacna (Didacna) Eichwald, 1838 represented as Didacna Eichwald, 1838
Subgenus Didacna (Pontalmyra) Stefanescu, 1896 † accepted as Pontalmyra Stefanescu, 1896 †
Subgenus Didacna (Protodidacna) Logvinenko & Starobogatov, 1966 accepted as Didacna Eichwald, 1838
Species Didacna adacnoides Nevesskaja, 1958 †
Species Didacna agalarovae Bogachev & Gadzhiev, 1967 †
Species Didacna agolarovae [sic] † accepted as Didacna agalarovae Bogachev & Gadzhiev, 1967 †
Species Didacna akschaena G. I. Popov, 1983 †
Species Didacna alata Bogachev & Gadzhiev, 1967 † accepted as Didacna eulachia Fedorov, 1948 †
Species Didacna alibajramliensis Gadzhiev, 1966 † accepted as Didacna baeri (Grimm, 1877)
Species Didacna alibajramlinica Vekilov, 1969 † accepted as Didacna carditoides Andrusov, 1910 †
Species Didacna aligulica Nevesskaja, 2007 †
Species Didacna andrusovi Gude, 1913 † accepted as Pontalmyra ovata (Deshayes, 1838) †
Species Didacna annosa Chelidze, 1947 † accepted as Pontalmyra annosa (Chelidze, 1947) †
Species Didacna anomala Nevesskaja, 2007 †
Species Didacna apscheronica Geivandova, 1956 † accepted as Didacna delenda Bogachev, 1932 †
Species Didacna artemiana Bogachev, 1932 †
Species Didacna atschistskalensis Gabuniya, 1953 † accepted as Pontalmyra subcrenulata (Andrusov, 1910) †
Species Didacna bacuana Eberzin †
Species Didacna baeri (Grimm, 1877)
Species Didacna baericrassa (Pavlov, 1925) †
Species Didacna barbotdemarnii (Grimm, 1877)
Species Didacna becenensis Andrusov, 1910 †
Species Didacna bendovanica Gadzhiev, 1968
Species Didacna bergi Fedorov, 1948 †
Species Didacna bogatschevi Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna bollenensis (Mayer, 1871) † accepted as Pontalmyra bollenensis (Mayer, 1871) †
Species Didacna borisphenica Nevesskaja, 1963 †
Species Didacna capellinii Gillet, 1963 †
Species Didacna carditoides Andrusov, 1910 †
Species Didacna carinata Nevesskaja, 2007
Species Didacna catalaunica Gillet, 1959 †
Species Didacna catilloides Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 †
Species Didacna catillus (Eichwald, 1841) †
Species Didacna celaeno Davitashvili, 1932 †
Species Didacna celekenica Fedorov, 1948 †
Species Didacna charamica Fedorov, 1953 †
Species Didacna charamica Ruzhentsev, 1928 †
Species Didacna chiae (Almera, 1894) † accepted as Pontalmyra incerta chiae (Almera, 1894) †
Species Didacna colossea Asadullaev, 1965 † accepted as Didacna pravoslavlevi pravoslavlevi Fedorov, 1948 †
Species Didacna convexa Geivandova, 1956 † accepted as Didacna umbonata Ebersin, 1958 †
Species Didacna corpulenta Zhukov, 1933 †
Species Didacna crassa (Eichwald, 1829) accepted as Didacna eichwaldi (Krynicki, 1837)
Species Didacna crassatellata (Deshayes, 1838) † accepted as Pontalmyra crassatellata (Deshayes, 1838) †
Species Didacna crassatelloides Andrusov, 1909 † accepted as Pontalmyra crassatelloides (Andrusov, 1909) †
Species Didacna cristata Bogachev, 1932 †
Species Didacna curta G. I. Popov, 1983 †
Species Didacna delenda Bogachev, 1932 †
Species Didacna deltastriata Livental, 1931 † accepted as Tschaudia tschaudae guriana (Livental, 1931) †
Species Didacna depereti Andrusov, 1909 † accepted as Pontalmyra depereti (Andrusov, 1909) †
Species Didacna deserta (Stoliczka, 1862) † accepted as Pontalmyra deserta (Stoliczka, 1862) †
Species Didacna digressa Livental, 1931 † accepted as Tschaudia digressa (Livental, 1931) †
Species Didacna dilatata Pravoslavlev, 1939 †
Species Didacna ebersini Fedorov, 1953 †
Species Didacna eichwaldi (Krynicki, 1837)
Species Didacna elongata Taner, 1974 †
Species Didacna elongatoovata Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 †
Species Didacna emendata G. I. Popov, 1983 †
Species Didacna eulachia Fedorov, 1948 †
Subspecies Didacna eulachia mingetschaurica Vekilov, 1969 † accepted as Didacna mingetschaurica Vekilov, 1969 †
Subspecies Didacna eulachia miussica G. I. Popov, 1983 † accepted as Didacna miussica G. I. Popov, 1983 †
Variety Didacna eulachia var. charamina Gadzhiev, 1966 † accepted as Didacna eulachia Fedorov, 1948 †
Species Didacna exlex Davitashvili, 1933 †
Species Didacna fedorovi Nevesskaja, 2007 †
Species Didacna frequens Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna fuchsi (Philippson, 1890) †
Species Didacna gibba Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna gilgilica Nevesskaja, 2007 †
Species Didacna gmelini Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna golubyatnikovi Yanina & Svitoch, 1987 †
Species Didacna grimmi Pravoslavlev, 1939 †
Species Didacna gurganica Vekilov, 1969 †
Species Didacna guriana Livental, 1931 † accepted as Tschaudia tschaudae guriana (Livental, 1931) †
Species Didacna guriensis Nevesskaja, 1963 †
Species Didacna hebes Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna hians Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 †
Species Didacna hospes Vekilov, 1969 †
Species Didacna hyrcana G. I. Popov, 1983 †
Species Didacna hyrcana Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna incerta (Deshayes, 1838) † accepted as Pontalmyra incerta (Deshayes, 1838) †
Species Didacna incrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna incrassata Bogachev, 1932 † accepted as Didacna nalivkini Vassoevich, 1930 †
Species Didacna infidelis "Taktakishvili, 1962" †
Species Didacna itilica G. I. Popov, 1983 †
Species Didacna janischevckii Geivandova, 1956 † accepted as Didacna artemiana Bogachev, 1932 †
Species Didacna karabugasica Bogachev †
Species Didacna karelini Fedorov, 1953 † accepted as Didacna pravoslavlevi karelini Fedorov, 1953 †
Species Didacna karpevitschae Bogachev & Gadzhiev, 1967 † accepted as Didacna porsugelica Nevesskaja, 1958 †
Species Didacna karpinskyi Andrusov, 1910 † accepted as Pontalmyra karpinskyi (Andrusov, 1910) †
Species Didacna knipovitshi Bogachev & Gadzhiev, 1967 † accepted as Didacna eulachia Fedorov, 1948 †
Species Didacna kolesnikovi Fedorov, 1953 †
Species Didacna kovalevskii Bogachev, 1932 †
Species Didacna kurovdagica Vekilov, 1969 † accepted as Didacna charamica Fedorov, 1953 †
Species Didacna laodicaeensis (Oppenheim, 1919) †
Species Didacna laskarevi Andrusov, 1909 † accepted as Pontalmyra laskarevi (Andrusov, 1909) †
Species Didacna latens Bogachev, 1932 †
Species Didacna lectosis (Fontannes, 1882) †
Species Didacna lindeyi [sic] † accepted as Didacna lindleyi Fedorov, 1948 †
Species Didacna lindleyi Fedorov, 1948 †
Species Didacna lintriculus Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna lissitzyni G. I. Popov, 1983 †
Species Didacna loerentheyi Andrusov, 1923 † accepted as Turcmena loerentheyi (Andrusov, 1923) †
Species Didacna longintermedia Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna longipes (Grimm, 1877)
Species Didacna lutrae Andrusov, 1909 † accepted as Pontalmyra incerta lutrae (Andrusov, 1909) †
Species Didacna medeae Davitashvili, 1932 † accepted as Pontalmyra medeae (Davitashvili, 1932) †
Species Didacna megrelica Taktakishvili, 1966 † accepted as Pontalmyra megrelica (Taktakishvili, 1966) †
Species Didacna meissarensis Andrusov, 1909 † accepted as Pontalmyra meissarensis (Andrusov, 1909) †
Species Didacna mingetschaurica Vekilov, 1969 †
Species Didacna mischovdagica Vekilov, 1969 †
Species Didacna miussica G. I. Popov, 1983 †
Species Didacna monodacnoides G. I. Popov, 1983 †
Species Didacna multintermedia Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna multistriata (Rousseau, 1842) † accepted as Pontalmyra multistriata (Rousseau, 1842) †
Species Didacna mutabilis G. F. Schneider, 1933 † accepted as Pontalmyra mutabilis (G. F. Schneider, 1933) †
Species Didacna nalivkini Vassoevich, 1930 †
Species Didacna naviculata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 †
Species Didacna novarossica (Barbot de Marny, 1869) † accepted as Pontalmyra novarossica (Barbot de Marny, 1869) †
Species Didacna obliquetrigona Pravoslavlev, 1939 †
Species Didacna obunca G. I. Popov, 1983 †
Species Didacna olla Nevesskaja, 1963 †
Species Didacna oriovacensis (Neumayr, 1875) † accepted as Plagiodacna carinata (Deshayes, 1838) †
Species Didacna ostroumovi Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna otiophora (Brusina, 1884) † accepted as Pontalmyra otiophora (Brusina, 1884) †
Species Didacna ovalis Yanina & Svitoch, 1987 †
Species Didacna ovata (Deshayes, 1838) † accepted as Pontalmyra ovata (Deshayes, 1838) †
Species Didacna ovatocrassa Pravoslavlev, 1939 †
Species Didacna ovatula Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 †
Species Didacna oxypleura Davitashvili, 1930 † accepted as Pontalmyra oxypleura (Davitashvili, 1930) †
Species Didacna paleotrigonoides Fedorov, 1953 † accepted as Didacna praetrigonoides paleotrigonoides Fedorov, 1953 †
Species Didacna pallasi Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 †
Species Didacna paracrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna parallela [sic] accepted as Didacna parallella Bogachev, 1932
Species Didacna parallella Bogachev, 1932
Species Didacna partschi (Mayer, 1871) † accepted as Pontalmyra partschi (Mayer, 1871) †
Species Didacna parvula Nalivkin, 1915 †
Species Didacna paucicostata (Deshayes, 1838) † accepted as Pontalmyra kamyshburunensis (Kafanov, 1980) †
Species Didacna paucintermedia Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna pavlovi Livental, 1931 † accepted as Tschaudia tschaudae guriana (Livental, 1931) †
Species Didacna perfecta Chelidze, 1947 † accepted as Pontalmyra perfecta (Chelidze, 1947) †
Species Didacna phrygica (Oppenheim, 1919) †
Species Didacna pirsagatica Andrusov, 1909 † accepted as Pontalmyra pirsagatica (Andrusov, 1909) †
Species Didacna plana Nevesskaja, 1958 †
Species Didacna planicostata (Deshayes, 1838) † accepted as Pontalmyra verneuilli (Deshayes, 1838) †
Species Didacna pleistopleura (Davitashvili, 1930) † accepted as Submonodacna pleistopleura (Davitashvili, 1930) †
Species Didacna plesiochora (Davitashvili, 1930) † accepted as Pontalmyra plesiochora (Davitashvili, 1930) †
Species Didacna plurintermedia Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna pontocaspia (Pavlov, 1925) †
Species Didacna porsugelica Nevesskaja, 1958 †
Species Didacna postcarditoides Nalivkin & Anisimov, 1914 † accepted as Didacna nalivkini Vassoevich, 1930 †
Species Didacna praepallasi Fedorov, 1999 † accepted as Didacna pseudocrassa pseudocrassa (Pavlov, 1925) †
Species Didacna praeprotracta Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 †
Species Didacna praetrigonoides Nalivkin & Anisimov, 1914 †
Species Didacna pravoslavlevi Fedorov, 1948 †
Species Didacna profundicola Logvinenko & Starobogatov, 1966
Species Didacna promultistriata (Jekelius, 1944) † accepted as Pontalmyra promultistriata (Jekelius, 1944) †
Species Didacna prona Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 †
Species Didacna protracta (Eichwald, 1829) †
Species Didacna protracta (Eichwald, 1841)
Species Didacna pseudocrassa (Pavlov, 1925) †
Species Didacna pseudoovata Gillet, 1965 †
Species Didacna pseudoplanicostata Gillet, 1965 †
Species Didacna pseudoprotracta Livental, 1931 † accepted as Didacna crassa (Eichwald, 1829)
Species Didacna pseudoschemachinica Gillet, 1961 †
Species Didacna pseudosulcatina Gillet, 1965 †
Species Didacna putcaradze Gadzhiev, 1968
Species Didacna puteana Bogachev, 1932 †
Species Didacna pyramidata (Grimm, 1877)
Species Didacna radiiferum (Andrusov, 1902) † accepted as Andrusovicardium radiiferum (Andrusov, 1902) †
Species Didacna raricostata G. I. Popov, 1983 †
Species Didacna rarissima Stevanović, 1951 † accepted as Pontalmyra rarissima (Stevanović, 1951) †
Species Didacna repens Taktakishvili, 1966 † accepted as Pontalmyra repens (Taktakishvili, 1966) †
Species Didacna roseni Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna roseni Ostroumov, 1912
Species Didacna rudis Nalivkin, 1915 †
Species Didacna ruzhencevi Asadullaev, 1966 † accepted as Didacna charamica Fedorov, 1953 †
Species Didacna schemachinica Andrusov, 1909 † accepted as Pontalmyra schemachinica (Andrusov, 1909) †
Species Didacna schirvanica Vekilov & Asadullaev, 1964 †
Species Didacna schuraosenica Svitoch & Chernova, 1978 †
Species Didacna serrata Livental, 1931 † accepted as Tschaudia tschaudae guriana (Livental, 1931) †
Species Didacna spondylopsis (Almera & Bofill y Poch, 1894) †
Species Didacna spratti (T. Fuchs, 1877) † accepted as Pontalmyra bollenensis (Mayer, 1871) †
Species Didacna squamosa G. F. Schneider, 1933 † accepted as Pontalmyra squamosa (G. F. Schneider, 1933) †
Species Didacna squamulosa Stevanović, 1951 † accepted as Pontalmyra squamulosa (Stevanović, 1951) †
Species Didacna subartemiana Pravoslavlev, 1939 †
Species Didacna subcarditoides Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 †
Species Didacna subcarinata (Deshayes, 1838) † accepted as Pontalmyra subcarinata (Deshayes, 1838) †
Species Didacna subcatillus Andrusov, 1910 †
Species Didacna subcrassa Pravoslavlev, 1939 †
Species Didacna subcrassatellata Andrusov, 1910 † accepted as Pontalmyra subcrassatellata (Andrusov, 1910) †
Species Didacna subcrenulata Andrusov, 1910 † accepted as Pontalmyra subcrenulata (Andrusov, 1910) †
Species Didacna subdepressa Andrusov, 1910 † accepted as Pontalmyra subdepressa (Andrusov, 1910) †
Species Didacna subdeserta (Lörenthey, 1902) † accepted as Lymnocardium subdesertum Lörenthey, 1902 †
Species Didacna subimbricata Pravoslavlev, 1939 †
Species Didacna subincerta Andrusov, 1910 † accepted as Pontalmyra subincerta (Andrusov, 1910) †
Species Didacna subintermedia Andrusov, 1923 † accepted as Turcmena intermedia (Eichwald, 1841) †
Species Didacna sublongipes Pravoslavlev, 1939 †
Species Didacna submedeae Gabuniya, 1953 † accepted as Pontalmyra multistriata (Rousseau, 1842) †
Species Didacna subovalis Pravoslavlev, 1939 † accepted as Didacna vulgaris Andrusov, 1910 †
Species Didacna suboxypleura Gabuniya, 1953 † accepted as Pontalmyra oxypleura (Davitashvili, 1930) †
Species Didacna subpallasi Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 †
Species Didacna subparallella Bogachev & Gadzhiev, 1967 † accepted as Didacna rudis Nalivkin, 1915 †
Species Didacna subpaucicostata (R. Hoernes, 1874) † accepted as Pontalmyra planicostata (Deshayes, 1838) †
Species Didacna subprotracta G. I. Popov, 1983 † accepted as Didacna subcatillus subcatillus Andrusov, 1910 †
Species Didacna subpyramidata Pravoslavlev, 1939 †
Species Didacna subquadrata Nevesskaja, 2007 †
Species Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 †
Species Didacna subsulcatina Andrusov, 1910 † accepted as Pontalmyra sulcatina subsulcatina (Andrusov, 1910) †
Species Didacna subsuscaltina [sic] † accepted as Didacna subsulcatina Andrusov, 1910 †
Species Didacna subtrigonula Nevesskaja, 2007 †
Species Didacna sundica Andrusov, 1909 † accepted as Pontalmyra sundica (Andrusov, 1909) †
Species Didacna surachanica Andrusov, 1910 †
Species Didacna symmetrica G. I. Popov, 1983 †
Species Didacna tamanica Nevesskaja, 1963 †
Species Didacna tanaitica G. I. Popov, 1983 †
Species Didacna triangula G. F. Schneider, 1933 † accepted as Pontalmyra triangula (G. F. Schneider, 1933) †
Species Didacna trigonoides (Pallas, 1771)
Species Didacna trigonula K. A. Ali-Zade, Vekilov & Geivandova, 1957 †
Species Didacna triquetra Livental, 1931 † accepted as Digressodacna triquetra (Livental, 1931) †
Species Didacna turkmena Andrusov, 1923 † accepted as Turcmena turkmena (Andrusov, 1923) †
Species Didacna turkmenica Nevesskaja, 2007 †
Species Didacna ultima G. I. Popov, 1983 †
Species Didacna umbonata Ebersin, 1958 †
Species Didacna verrucosicostata Seninski, 1905 † accepted as Pontalmyra incerta verrucosicostata (Seninski, 1905) †
Species Didacna vicina Pravoslavlev, 1939 † accepted as Didacna subimbricata Pravoslavlev, 1939 †
Species Didacna voskobojnikovi Andrusov, 1910 † accepted as Pontalmyra voskobojnikovi (Andrusov, 1910) †
Species Didacna vulgaris Andrusov, 1910 †
Species Didacna zhukovi Fedorov, 1953 † accepted as Didacna delenda Bogachev, 1932 †
Genus Didacnoides Astaf'yeva, 1960 † (5)
Genus Hypanis Ménétries, 1832 (2)
Genus Hyrcania V. P. Kolesnikov, 1950 † accepted as Turcmena G. I. Popov, 1956 †
Genus Irinia G. I. Popov, 1956 † accepted as Turcmena G. I. Popov, 1956 †
Genus Monodacna Eichwald, 1838 (31)
Genus Neoadacna A. A. Ali-Zade, 1973 accepted as Adacna Eichwald, 1838
Genus Neodidacnomya A. A. Ali-Zade, 1973 † accepted as Didacnoides Astaf'yeva, 1960 †
Genus Neomonodacna A. A. Ali-Zade, 1973 accepted as Monodacna Eichwald, 1838
Genus Parapscheronia Eberzin, 1955 † (5)
Genus Plagiodacnopsis Andrusov, 1923 † (2)
Genus Turcmena G. I. Popov, 1956 † (12)
Genus Turkmena [sic] † accepted as Turcmena G. I. Popov, 1956 †
Tribe Arcicardiini Nevesskaja, 1986 † (32)
Tribe Avicardiini S. V. Popov, 1977 † (22)
Tribe Aviculocardiini Paramonova, 2001 † (5)
Tribe Cerastodermatini F. Nordsieck, 1969 (40)
Tribe Chokrakiini S. V. Popov, 2001 † (1)
Tribe Hyrcaniini Kafanov & Starobogatov, 1977 † accepted as Adacnini Gill, 1871
Tribe Limnopappini Schlickum, 1962 † (17)
Tribe Lymnocardiini Stoliczka, 1870 † (186)
Tribe Merklinicardiini S. V. Popov, 2001 † (3)
Tribe Obsoletiformini Paramonova, 2001 † (59)
Tribe Pachydacnini Andreescu, 1975 † (47)
Tribe Paradacnini Eberzin, 1965 † (26)
Tribe Parvicardiini Kafanov & Starobogatov, 1977 (42)
Tribe Phyllocardiini Nevesskaja, 1986 † (13)
Tribe Planacardiini Paramonova, 2001 † (4)
Tribe Plicatiformini Paramonova, 2001 † (7)
Tribe Pontalmyrini Taktakischvili, 1981 † (186)
Tribe Prosodacnini Keen, 1937 † (68)
Genus Brachiodacna Eberzin, 1965 †
Genus Chartadacna Chelidze, 1953 †
Genus Didacnomya Andrusov, 1923 † accepted as Pseudocatillus Andrusov, 1903 †
Genus Gilletella Marinescu, 1973 † (2)
Genus Goethemia Lambiotte, 1979 (2)
Genus Kolesnikovia Muskhelishvili, 1966 †
Genus Myocardia Vest, 1861 † accepted as Lymnocardium Stoliczka, 1870 †
Genus Papyrocardium Gabuniya, 1953 †
Genus Prophyllicardium Jekelius, 1944 †
Genus Uniocardium Capellini, 1880 † (1)
Subfamily Nemocardiinae ter Poorten, 2023 (107)
Subfamily Orthocardiinae J. A. Schneider, 2002 (67)
Subfamily Pleuriocardiinae J. A. Schneider, 1995 † (3)
Subfamily Profraginae Badve, 1977 † (6)
Subfamily Protocardiinae Bronn, 1849 † (37)
Subfamily Stylodacninae Papaianopol, 1987 † accepted as Prosodacnini Keen, 1937 †
Subfamily Trachycardiinae R. B. Stewart, 1930 (120)
Subfamily Tridacninae Lamarck, 1819 (19)
Tribe Clinocardiini Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
Tribe Serripedini Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
Genus Cerastes Poli, 1795 accepted as Cardium (Cerastoderma) Poli, 1795
Genus Divaricardium Dollfus & Dautzenberg, 1886 † (2)
Genus Fuscocardium Oyama, 1973 † accepted as Clinocardium Keen, 1936
Genus Trigonocardia [sic] accepted as Trigoniocardia Dall, 1900
Family Chametracheidae H. Adams & A. Adams, 1857 accepted as Tridacninae Lamarck, 1819
Family Clinocardiidae Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
Family Fragidae R. B. Stewart, 1930 accepted as Fraginae R. B. Stewart, 1930
Family Goniocardiidae Scarlato & Starobogatov, 1979 † accepted as Tridacninae Lamarck, 1819
Family Lymnocardiidae Stoliczka, 1870 accepted as Lymnocardiinae Stoliczka, 1870
Family Pterocardiidae Scarlato & Starobogatov, 1979 † (10)
Family Tridacnidae Lamarck, 1819 accepted as Tridacninae Lamarck, 1819
Superfamily Tellinacea accepted as Tellinoidea Blainville, 1814
Superfamily Tellinoidea Blainville, 1814 (1 304)
Superfamily Tridacnoidea accepted as Tridacninae Lamarck, 1819
Order Galeommatida (791)
Order Gastrochaenida (43)
Order Hiatellida represented as Adapedonta
Order Hippuritida † (321)
Order Lucinida (997)
Order Megalodontida † (141)
Order Modiomorphida † (94)
Order Myacea accepted as Myida
Order Myida (924)
Order Sphaeriida (662)
Order Venerida (2 821)
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 † (90)
Superfamily Kalenteroidea Marwick, 1953 † (39)
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 (4 072)
Superorder Heteroconchia incertae sedis † (1)
Infraclass Pteriomorphia (6 658)
Subclass Bivalvia incertae sedis (7)
Subclass Palaeotaxodonta accepted as Nuculida
Subclass Paleoheterodonta accepted as Palaeoheterodonta
Subclass Protobranchia (1 365)
Infraclass Cryptodonta † (342)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 697)
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