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)
- 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)
- Order Galeommatida (791)
- Order Gastrochaenida (43)
- Superfamily Gastrochaenoidea J. E. Gray, 1840 (43)
- Family Chaenidae J. E. Gray, 1858 accepted as Gastrochaenidae J. E. Gray, 1840
- Family Gastrochaenidae J. E. Gray, 1840 (43)
- Genus Carterochaena Fürsich, T. J. Palmer & Goodyear, 1994 †
- Genus Chaena Philipsson, 1788 accepted as Gastrochaena Spengler, 1783
- Genus Cucurbitula A. Gould, 1861 (3)
- Genus Dufoichaena Jousseaume, 1923 (2)
- Genus Eufistulana Eames, 1951 (4)
- Genus Fistulana Bruguière, 1789 accepted as Eufistulana Eames, 1951
- Genus Gastrochaena Spengler, 1783 (13)
- Subgenus Gastrochaena (Gastrochaena) Spengler, 1783 accepted as Gastrochaena Spengler, 1783
- Species Gastrochaena (Gastrochaena) ecuadoriensis Olsson, 1961 accepted as Lamychaena truncata (G. B. Sowerby I, 1834)
- Subgenus Gastrochaena (Gastrochaenopsis) Chavan, 1952 †
- Subgenus Gastrochaena (Rocellaria) Blainville, 1829 accepted as Rocellaria Blainville, 1829
- Subgenus Gastrochaena (Spengleria) Tryon, 1861 accepted as Spengleria Tryon, 1861
- Species Gastrochaena aequabilis Sluiter, 1890 accepted as Cucurbitula cymbium (Spengler, 1783)
- Species Gastrochaena americana J. D. Kurtz, 1860
- Species Gastrochaena ampla Étallon, 1862 †
- Species Gastrochaena apertissima Deshayes, 1855 accepted as Spenglerichaena apertissima (Deshayes, 1855)
- Species Gastrochaena australis Etheridge, 1892 †
- Species Gastrochaena boucardensis de Loriol, 1874 †
- Species Gastrochaena brevis G. B. Sowerby I, 1834
- Species Gastrochaena callosa R. A. Philippi, 1845 accepted as Spengleria rostrata (Spengler, 1793)
- Species Gastrochaena carcellesi Castellanos, 1970 accepted as Rocellaria carcellesi (Castellanos, 1970)
- Species Gastrochaena carteri C. Nielsen, 1986
- Species Gastrochaena conchyliophila Pallary, 1900 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena cottaldina de Loriol, 1868 †
- Species Gastrochaena cucullata Deshayes, 1855 accepted as Lamychaena hians (Gmelin, 1791)
- Species Gastrochaena cuneiformis Spengler, 1783
- Species Gastrochaena cybium [sic] accepted as Cucurbitula cymbium (Spengler, 1783)
- Species Gastrochaena cylindrica Étallon, 1862 †
- Species Gastrochaena cymbium Spengler, 1783 accepted as Cucurbitula cymbium (Spengler, 1783)
- Species Gastrochaena denticulata Deshayes, 1855
- Species Gastrochaena dentifera Dufo, 1840 accepted as Dufoichaena dentifera (Dufo, 1840)
- Species Gastrochaena deshayesi Sturany, 1899 accepted as Cucurbitula cymbium (Spengler, 1783)
- Species Gastrochaena difficilis Deshayes, 1855
- Species Gastrochaena distincta de Folin, 1867 accepted as Gastrochaena denticulata Deshayes, 1855
- Species Gastrochaena dubia (Pennant, 1777) accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena ecuadoriensis Olsson, 1961 accepted as Lamychaena truncata (G. B. Sowerby I, 1834)
- Species Gastrochaena flora de Loriol, 1888 †
- Species Gastrochaena folini Deshayes, 1867 accepted as Lamychaena truncata (G. B. Sowerby I, 1834)
- Species Gastrochaena fragilissima K. Martin, 1915 †
- Species Gastrochaena frondosa Cotton, 1934
- Species Gastrochaena gigantea (Deshayes, 1830) accepted as Gastrochaena cuneiformis Spengler, 1783
- Species Gastrochaena gracilis Étallon, 1863 †
- Species Gastrochaena grandis (Deshayes, 1855) sensu Dunker, 1882 accepted as Gastrochaena cuneiformis Spengler, 1783
- Species Gastrochaena granifera Étallon, 1863 †
- Species Gastrochaena heyseana R. A. Philippi, 1847 †
- Species Gastrochaena hians (Gmelin, 1791) accepted as Lamychaena hians (Gmelin, 1791)
- Species Gastrochaena hians J. Fleming, 1828 accepted as Gastrochaena dubia (Pennant, 1777)
- Species Gastrochaena hoernesi Benoist, 1877 † accepted as Rocellaria hoernesi (Benoist, 1877) †
- Species Gastrochaena humilis Deshayes, 1855
- Species Gastrochaena hyalina G. B. Sowerby I, 1834 accepted as Gastrochaena ovata G. B. Sowerby I, 1834
- Species Gastrochaena impressa Deshayes, 1855 accepted as Spengleria apertissima (Deshayes, 1855)
- Species Gastrochaena inaequistriata Jousseaume, 1923 accepted as Lamychaena inaequistriata (Jousseaume, 1923)
- Species Gastrochaena indistincta Deshayes, 1855
- Species Gastrochaena intermedia M. Hörnes, 1859 †
- Species Gastrochaena interrupta Deshayes, 1855 accepted as Dufoichaena dentifera (Dufo, 1840)
- Species Gastrochaena intersecta Deshayes, 1855
- Species Gastrochaena kanaka (Dall, Bartsch & Rehder, 1938)
- Species Gastrochaena laevigata Deshayes, 1855
- Species Gastrochaena lamellosa Deshayes, 1855 accepted as Gastrochaena cuneiformis Spengler, 1783
- Species Gastrochaena ligua [sic] † accepted as Gastrochaena ligula H. C. Lea, 1845 †
- Species Gastrochaena ligula H. C. Lea, 1845 †
- Species Gastrochaena macroschisma Deshayes, 1855
- Species Gastrochaena modiolina Lamarck, 1818 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena mowbrayi C. A. Davis, 1904 accepted as Gastrochaena difficilis Deshayes, 1855
- Species Gastrochaena mumia Spengler, 1783 accepted as Eufistulana mumia (Spengler, 1783)
- Species Gastrochaena mytiloides Lamarck, 1818 accepted as Spengleria mytiloides (Lamarck, 1818)
- Species Gastrochaena ovata G. B. Sowerby I, 1834
- Species Gastrochaena pelagica Risso, 1826 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena pexiphora Sturany, 1899 accepted as Dufoichaena pexiphora (Sturany, 1899)
- Species Gastrochaena philippinensis Deshayes, 1855
- Species Gastrochaena plicatilis Deshayes, 1855 accepted as Spengleria mytiloides (Lamarck, 1818)
- Species Gastrochaena poliana R. A. Philippi, 1845 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena polii R. A. Philippi, 1844 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena pontileviensis de Morgan, 1916 †
- Species Gastrochaena pupina Deshayes, 1855 accepted as Cucurbitula cymbium (Spengler, 1783)
- Species Gastrochaena retzii Deshayes, 1863 accepted as Spengleria mytiloides (Lamarck, 1818)
- Species Gastrochaena rugulosa G. B. Sowerby I, 1834 accepted as Lamychaena truncata (G. B. Sowerby I, 1834)
- Species Gastrochaena ruppellii Deshayes, 1855 accepted as Rocellaria ruppellii (Deshayes, 1855)
- Species Gastrochaena savignyi Pallary, 1926 accepted as Rocellaria ruppellii (Deshayes, 1855)
- Species Gastrochaena spathulata Deshayes, 1855
- Species Gastrochaena spengleri Blainville, 1824 † accepted as Spengleria spengleri (Blainville, 1824) †
- Species Gastrochaena stimpsoni [sic] accepted as Rocellaria stimpsonii Tryon, 1861
- Species Gastrochaena stimpsonii (Tryon, 1861) accepted as Rocellaria stimpsonii Tryon, 1861
- Species Gastrochaena striatula Aldrich, 1903 †
- Species Gastrochaena substricta Étallon, 1862 †
- Species Gastrochaena tarentina O. G. Costa, 1830 accepted as Rocellaria dubia (Pennant, 1777)
- Species Gastrochaena tasmanica Tenison Woods, 1877 accepted as Cucurbitula tasmanica (Tenison Woods, 1877)
- Species Gastrochaena tenera Deshayes, 1855
- Species Gastrochaena tortuosa J. De C. Sowerby, 1826 †
- Species Gastrochaena truncata G. B. Sowerby I, 1834 accepted as Lamychaena truncata (G. B. Sowerby I, 1834)
- Species Gastrochaena tumidula Thiele, 1930 accepted as Spengleria apertissima (Deshayes, 1855)
- Species Gastrochaena valfinensis de Loriol, 1888 †
- Species Gastrochaena voracissima J. Müller, 1851 †
- Species Gastrochaena weinkauffi Sturany, 1899 accepted as Lamychaena weinkauffi (Sturany, 1899)
- Species Gastrochaena zitteli G. Boehm, 1883 †
- Genus Gastrochaenopsis Chavan, 1952 †
- Genus Gastrochena accepted as Gastrochaena Spengler, 1783
- Genus Gastrochoena accepted as Gastrochaena Spengler, 1783
- Genus Lamychaena Freneix, 1979 (5)
- Genus Llosaria Quintana, 2015 † (1)
- Genus Rocellaria Blainville, 1829 (11)
- Genus Spengleria Tryon, 1861 (3)
- Genus Spenglerichaena J. G. Carter, 2011 (1)
- Family Rocellariidae Ridewood, 1903 accepted as Gastrochaenidae J. E. Gray, 1840
- 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