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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)
- Infraclass Pteriomorphia (6 658)
- Superorder Eupteriomorphia
- Order Arcida (1 227)
- Order Colpomyida † (6)
- Order Cyrtodontida † (66)
- Order Limida (358)
- Order Myalinida † (576)
- Order Mytilida (706)
- Superfamily Modiolopsoidea P. Fischer, 1886 † (45)
- Superfamily Mytilacea accepted as Mytiloidea Rafinesque, 1815
- Superfamily Mytiloidea Rafinesque, 1815 (661)
- Family Crenellidae J. E. Gray, 1840 accepted as Crenellinae J. E. Gray, 1840
- Family Modiolidae G. Termier & H. Termier, 1950 (250)
- Subfamily Bathymodiolinae Kenk & B. R. Wilson, 1985 (78)
- Subfamily Botulinae Scarlato & Starobogatov, 1979 (45)
- Subfamily Ciboticolinae B. Morton, J.H. Wei, Leung, S. Chan & Dinesen, 2024 (2)
- Subfamily Limnoperninae Scarlato & Starobogatov, 1979 (20)
- Subfamily Modiolidae incertae sedis (2)
- Subfamily Modiolinae G. Termier & H. Termier, 1950 (94)
- Genus Arenifodiens B. R. Wilson, 2006 (1)
- Genus Callitriche Poli, 1791 accepted as Gibbomodiola Sacco, 1898
- Genus Gibbomodiola Sacco, 1898 (1)
- Genus Modiola [sic] accepted as Modiolus Lamarck, 1799
- Genus Modiolatus Jousseaume, 1893 (10)
- Genus Modiolus Lamarck, 1799 (77)
- Subgenus Modiolus (Amygdalum) Megerle von Mühlfeld, 1811 accepted as Amygdalum Megerle von Mühlfeld, 1811
- Subgenus Modiolus (Brachydontes) Swainson, 1840 accepted as Brachidontes Swainson, 1840
- Subgenus Modiolus (Eumodiolus) Ihering, 1900 accepted as Modiolus Lamarck, 1799
- Subgenus Modiolus (Mauricia) G. D. Harris, 1919 † represented as Mauricia G. D. Harris, 1919 †
- Subgenus Modiolus (Modiolaria) Lovén, 1846 accepted as Musculus Röding, 1798
- Subgenus Modiolus (Modiolus) Lamarck, 1799 represented as Modiolus Lamarck, 1799
- Subgenus Modiolus (Modiolusia) G. Yamamoto & Habe, 1958 accepted as Jolya Bourguignat, 1877
- Subgenus Modiolus (Musculus) Röding, 1798 accepted as Musculus Röding, 1798
- Subgenus Modiolus (Strimodiolus) Fürsich, 1982 † represented as Modiolus Lamarck, 1799
- Species Modiolus abaensis Betekhtina, 1979 †
- Species Modiolus abyssicola Knudsen, 1970 accepted as Benthomodiolus abyssicola (Knudsen, 1970)
- Species Modiolus adelaidensis Tate, 1886 †
- Species Modiolus adriaticus Lamarck, 1819
- Species Modiolus affinis (K. Martin, 1879) † accepted as Lithophaga affinis (K. Martin, 1879) †
- Species Modiolus agglutinans Cantraine, 1835 accepted as Lioberus agglutinans (Cantraine, 1835)
- Species Modiolus agripeta Iredale, 1939 accepted as Modiolus auriculatus Krauss, 1848
- Species Modiolus albicosta Lamarck, 1819
- Species Modiolus albicostata [sic] accepted as Modiolus albicosta Lamarck, 1819
- Species Modiolus albicostatus [sic] accepted as Modiolus albicosta Lamarck, 1819
- Species Modiolus altijugatus Marwick, 1931 † accepted as Xenostrobus altijugatus (Marwick, 1931) †
- Species Modiolus amaurus Cossmann, 1892 †
- Species Modiolus americanus Leach, 1815
- Species Modiolus aratus (Dunker, 1857) accepted as Jolya arata (Dunker, 1857)
- Species Modiolus arborescens (Dillwyn, 1817) accepted as Amygdalum arborescens (Fischer von Waldheim, 1807)
- Species Modiolus arciformis Dall, 1909 accepted as Mytella charruana (A. d'Orbigny, 1846)
- Species Modiolus arcuatulus Hanley, 1844 accepted as Arcuatula arcuatula (Hanley, 1844)
- Species Modiolus areolatus (A. Gould, 1850)
- Species Modiolus ater (Zelebor, 1866) accepted as Xenostrobus neozelanicus (Iredale, 1915)
- Species Modiolus auriculatus Krauss, 1848
- Species Modiolus aurum Osorio, 1979
- Species Modiolus australis (J. E. Gray, 1826) accepted as Modiolus areolatus (A. Gould, 1850)
- Species Modiolus bakeri Dickerson, 1914 †
- Species Modiolus balongensis K. Martin, 1931 †
- Species Modiolus barbatellus Cantraine, 1835 accepted as Gregariella petagnae (Scacchi, 1832)
- Species Modiolus barbatus (Linnaeus, 1758)
- Species Modiolus baylei (R. A. Philippi, 1899) †
- Species Modiolus bipartitus J. Sowerby, 1818 †
- Species Modiolus biradiatus Hanley, 1843
- Species Modiolus bourailensis (T. D. A. Cockerell, 1929)
- Species Modiolus brassoensis Maury, 1925 †
- Species Modiolus brocchii M. Hörnes, 1867 †
- Species Modiolus buglovensis Gatuev, 1916 † accepted as Mytilaster volhynicus buglovensis (Gatuev, 1916) †
- Species Modiolus capax Conrad, 1837
- Species Modiolus capensis (Krauss, 1848) accepted as Arcuatula capensis (Krauss, 1848)
- Species Modiolus carpenteri T. Soot-Ryen, 1963
- Species Modiolus carvalhoi Klappenbach, 1966
- Species Modiolus cecillii (R. A. Philippi, 1847)
- Species Modiolus cimbricus Ockelmann & Cedhagen, 2019
- Species Modiolus cinnamomeus (Gmelin, 1791) accepted as Botula cinnamomea (Gmelin, 1791)
- Species Modiolus cochlear (Menke, 1848)
- Species Modiolus comptus (G. B. Sowerby III, 1915)
- Species Modiolus costulatus Risso, 1826 accepted as Musculus costulatus (Risso, 1826)
- Species Modiolus cottoni Laseron, 1956 accepted as Modiolus areolatus (A. Gould, 1850)
- Species Modiolus cumingianus (Reeve, 1857) accepted as Musculus cumingianus (Reeve, 1857)
- Species Modiolus curvatus (Dunker, 1857) accepted as Brachidontes mutabilis (A. Gould, 1861)
- Species Modiolus curvus Betekhtina, 1979 †
- Species Modiolus cylindricus (Krauss, 1848) accepted as Lithophaga cylindrica (Krauss, 1848)
- Species Modiolus delinificus Iredale, 1924 accepted as Modiolus albicosta Lamarck, 1819
- Species Modiolus demissus (Dillwyn, 1817) accepted as Geukensia demissa (Dillwyn, 1817)
- Species Modiolus diegensis Dall, 1911 accepted as Adula diegensis (Dall, 1911)
- Species Modiolus difficilis (Deshayes, 1863) accepted as Gregariella difficilis (Deshayes, 1863)
- Species Modiolus difficilis (T. Habe & Kuroda, 1950) accepted as Modiolus kurilensis F. R. Bernard, 1983
- Species Modiolus directus Dall, 1909 accepted as Modiolus rectus Conrad, 1837
- Species Modiolus dolabratus Deshayes, 1858 †
- Species Modiolus dolichus Suter, 1917 † accepted as Amygdalum striatum (F. W. Hutton, 1873)
- Species Modiolus dubius Prashad, 1932 accepted as Adipicola dubia (Prashad, 1932)
- Species Modiolus eiseni A. M. Strong & Hertlein, 1937
- Species Modiolus elegans (Gray, 1828) accepted as Arcuatula elegans (Gray, 1828)
- Species Modiolus elongatus Swainson, 1821 accepted as Jolya elongata (Swainson, 1821)
- Species Modiolus elongatus Fürsich, 1982 †
- Species Modiolus ficoides Macsotay & Campos, 2001
- Species Modiolus flabellatus (A. Gould, 1850) accepted as Modiolus rectus Conrad, 1837
- Species Modiolus flavidus (Dunker, 1857) accepted as Modiolatus flavidus (Dunker, 1857)
- Species Modiolus flemischi K. Martin, 1933 †
- Species Modiolus floridus Dunker
- Species Modiolus friesenbichlerae Dominici & Danise, 2024 †
- Species Modiolus gallicus (Dautzenberg, 1895) accepted as Modiolus modiolus (Linnaeus, 1758)
- Species Modiolus gigantus J.-H. Li, B.-L. Ding & C. Li, 1982 †
- Species Modiolus glaberrimus (Dunker, 1857) accepted as Arcuatula glaberrima (Dunker, 1857)
- Species Modiolus gubernaculum (Dunker, 1857)
- Species Modiolus heishantouensis Z.-R. Yang, 1983 †
- Species Modiolus hoernesi Reuss, 1867 †
- Species Modiolus huttoni Suter, 1914 † accepted as Xenostrobus huttoni (Suter, 1914) †
- Species Modiolus imbricatus (J. Sowerby, 1818) †
- Species Modiolus incrassatus (A. d'Orbigny, 1844) †
- Species Modiolus intermedius Foresti, 1874 †
- Species Modiolus javanus (K. Martin, 1879) †
- Species Modiolus jingxingzuanus F.-X. Guo, 1987 †
- Species Modiolus kaikourensis (H. Woods, 1917) †
- Species Modiolus katscharavai Kharatishvili, 1952 †
- Species Modiolus kelsoensis C. E. Weaver & K. van W. Palmer, 1922 †
- Species Modiolus kolesnikovi Liverovskaya, 1935 † accepted as Mytilaster volhynicus kolesnikovi (Liverovskaya, 1935) †
- Species Modiolus kurilensis F. R. Bernard, 1983
- Species Modiolus kuzgunsuensis J.-M. Wei, 1984 †
- Species Modiolus latecaudatus (Pritchard, 1903) †
- Species Modiolus ligneus (Reeve, 1858) accepted as Lioberus ligneus (Reeve, 1858)
- Species Modiolus lineus (Hedley, 1907)
- Species Modiolus lucidus Zhizhchenko, 1936 † accepted as Mytilaster volhynicus sultanensis (Gatuev, 1916) †
- Species Modiolus lulat (Dautzenberg, 1891)
- Species Modiolus maeoticus Nevesskaja, 1976 †
- Species Modiolus margaritaceus (Nomura & Hatai, 1940)
- Species Modiolus martini (Schepman, 1907) †
- Species Modiolus martorelli Hidalgo, 1877
- Species Modiolus matris Pilsbry, 1921
- Species Modiolus metcalfei (Hanley, 1843) accepted as Modiolus modulaides (Röding, 1798)
- Species Modiolus minutus (Zieten, 1833) †
- Species Modiolus modiolus (Linnaeus, 1758)
- Species Modiolus modulaides (Röding, 1798)
- Species Modiolus montmollini (F.-J. Pictet & Campiche, 1866) †
- Species Modiolus mooraboolensis Chapman, 1922 †
- Species Modiolus mortenseni Schnetler & M. S. Nielsen, 2018 †
- Species Modiolus neglectus T. Soot-Ryen, 1955 accepted as Modiolatus neglectus (T. Soot-Ryen, 1955)
- Species Modiolus nekhoroschevi Betekhtina, 1979 †
- Species Modiolus neozelanicus Iredale, 1915 accepted as Xenostrobus neozelanicus (Iredale, 1915)
- Species Modiolus nicklesi Ockelmann, 1983
- Species Modiolus nigeriensis Nicklès, 1955 accepted as Modiolatus nigeriensis (Nicklès, 1955)
- Species Modiolus nipponicus (Oyama, 1950)
- Species Modiolus nitens Menke, 1848 accepted as Xenostrobus pulex (Lamarck, 1819)
- Species Modiolus nonuranus Pilsbry & Olsson, 1935 accepted as Semimytilus algosus (Gould, 1850)
- Species Modiolus ostentus Iredale, 1939 accepted as Jolya rhomboidea (Reeve, 1857)
- Species Modiolus oyamai Habe, 1981 accepted as Modiolatus oyamai (Habe, 1981)
- Species Modiolus pacificus Olsson, 1961 accepted as Modiolatus pacificus (Olsson, 1961)
- Species Modiolus pallidulus Dall, 1916 accepted as Amygdalum pallidulum (Dall, 1916)
- Species Modiolus patagonicus (A. d'Orbigny, 1846) accepted as Semimytilus patagonicus (Hanley, 1843)
- Species Modiolus penelegans Iredale, 1939 accepted as Modiolus modulaides (Röding, 1798)
- Species Modiolus penetectus Verco, 1907
- Species Modiolus perfragilis (Dunker, 1857) accepted as Arcuatula perfragilis (Dunker, 1857)
- Species Modiolus peronianus Laseron, 1956 accepted as Modiolus areolatus (A. Gould, 1850)
- Species Modiolus phaseolinus R. A. Philippi, 1844 accepted as Modiolula phaseolina (R. A. Philippi, 1844)
- Species Modiolus phenax (Dall, 1915) accepted as Musculus phenax Dall, 1915
- Species Modiolus philippinarum Hanley, 1843
- Species Modiolus planatus Tomlin, 1928 accepted as Mytella speciosa (Reeve, 1857)
- Species Modiolus playasensis Pilsbry & Olsson, 1935 accepted as Brachidontes playasensis (Pilsbry & Olsson, 1935)
- Species Modiolus plicatus (Gmelin, 1791) accepted as Modiolatus plicatus (Gmelin, 1791)
- Species Modiolus praeruptus Pritchard, 1901 †
- Species Modiolus proclivis Iredale, 1939 accepted as Modiolus rufus Fischer von Waldheim, 1807
- Species Modiolus pseudobarbatus Ockelmann, 1983
- Species Modiolus pseudotulipus Olsson, 1961 accepted as Modiolus americanus Leach, 1815
- Species Modiolus pueblensis (Pritchard, 1901) †
- Species Modiolus pulex Lamarck, 1819 accepted as Xenostrobus pulex (Lamarck, 1819)
- Species Modiolus pulvillus Iredale, 1939 accepted as Modiolatus pulvillus (Iredale, 1939)
- Species Modiolus qijiagouensis Z.-R. Yang, 1983 †
- Species Modiolus rectus Conrad, 1837
- Species Modiolus restorationensis Van Winkle, 1918 †
- Species Modiolus reversus J. De C. Sowerby, 1836 †
- Species Modiolus rhomboideus (Reeve, 1857) accepted as Jolya rhomboidea (Reeve, 1857)
- Species Modiolus rufus Fischer von Waldheim, 1807
- Species Modiolus rumphii R. A. Philippi, 1847 accepted as Modiolus rufus Fischer von Waldheim, 1807
- Species Modiolus sacculifer (S. S. Berry, 1953)
- Species Modiolus sagittatus Rehder, 1935 accepted as Amygdalum sagittatum (Rehder, 1935)
- Species Modiolus scalprum J. Sowerby, 1821 †
- Species Modiolus semifuscus Lamarck, 1819
- Species Modiolus semilaevigatus Deshayes, 1858 †
- Species Modiolus semirutus Zhizhchenko, 1934 †
- Species Modiolus senhausii W. H. Benson, 1842 accepted as Arcuatula senhousia (W. H. Benson, 1842)
- Species Modiolus sichuanensis Q.-H. Ma, 1984 †
- Species Modiolus simplex Leymerie, 1842 †
- Species Modiolus sirahensis Jousseaume, 1891 accepted as Jolya rhomboidea (Reeve, 1857)
- Species Modiolus squamosus Beauperthuy, 1967
- Species Modiolus stalderi B. Martin, 1914 accepted as Musculus niger (J. E. Gray, 1824)
- Species Modiolus striatulus (Hanley, 1843) accepted as Dentimodiolus striatulus (Hanley, 1843)
- Species Modiolus stultorum (Jousseaume, 1893) accepted as Jolya letourneuxi Bourguignat, 1877
- Species Modiolus subcarinatus Lamarck, 1805 †
- Species Modiolus subpictus Cantraine, 1835 accepted as Musculus subpictus (Cantraine, 1835)
- Species Modiolus subsulcatus (Dunker, 1857) accepted as Dentimodiolus subsulcatus (Dunker, 1857)
- Species Modiolus sulcatus Risso, 1826 accepted as Gregariella petagnae (Scacchi, 1832)
- Species Modiolus thomsoni Zinsmeister, 1984 †
- Species Modiolus thorsoni Ockelmann, 1983 accepted as Modiolus lulat (Dautzenberg, 1891)
- Species Modiolus trailii [sic] accepted as Modiolus traillii Reeve, 1857
- Species Modiolus traillii Reeve, 1857
- Species Modiolus trimeuseli Kuhn, 1936 † accepted as Modiolus imbricatus (J. Sowerby, 1818) †
- Species Modiolus tulipa Lamarck, 1819 accepted as Modiolus americanus Leach, 1815
- Species Modiolus tumbezensis Pilsbry & Olsson, 1935 accepted as Mytella tumbezensis (Pilsbry & Olsson, 1935)
- Species Modiolus tumescens Clessin, 1888
- Species Modiolus turneri Zinsmeister, 1984 †
- Species Modiolus undulatus (Dunker, 1857) accepted as Brachidontes undulatus (Dunker, 1857)
- Species Modiolus ustjurtensis Zhizhchenko, 1937 † accepted as Modiolus adriaticus Lamarck, 1819
- Species Modiolus vagina Lamarck, 1819 accepted as Arenifodiens vagina (Lamarck, 1819)
- Species Modiolus ventricosus F. A. Roemer, 1836 †
- Species Modiolus verdensis Cosel, 1995
- Species Modiolus veronensis Trask, 1922 †
- Species Modiolus volhynicus (Eichwald, 1829) † accepted as Mytilaster volhynicus (Eichwald, 1829) †
- Species Modiolus waringi Maury, 1925 †
- Species Modiolus willapaensis Squires & Goedert, 1991 † accepted as Bathymodiolus willapaensis (Squires & Goedert, 1991) †
- Species Modiolus wyomingensis I. Lea, 1853 † accepted as Myalina wyomingensis (I. Lea, 1853) †
- Species Modiolus zujovici (Radovanović, 1888) †
- Genus Nudiola Monterosato, 1917 accepted as Gibbomodiola Sacco, 1898
- Genus Phthonia J. Hall & Whitfield, 1869 † (4)
- Genus Stavelia J. E. Gray, 1858 (1)
- Genus Tamarindiformis Kuroda, 1931 accepted as Modiolus Lamarck, 1799
- Genus Volsella Scopoli, 1777 accepted as Modiolus Lamarck, 1799
- Subfamily Xenostrobinae K. S. Tan, S. H. M. Tan, K. Sanpanich, T. Duangdee & R. Ambarwati, 2022 (9)
- Family Musculidae Iredale, 1939 accepted as Crenellinae J. E. Gray, 1840
- Family Mytilidae Rafinesque, 1815 (411)
- Family Septiferidae Scarlato & Starobogatov, 1979 accepted as Septiferinae Scarlato & Starobogatov, 1979
- Order Ostreida (705)
- Order Pectinida (3 004)
- Order Pteriida accepted as Ostreida
- Order Pteriomorphia incertae sedis † (1)
- Superfamily Yunannioidea R.-J. Zhang & Z.-J. Niu, 2021 † (2)
- Family Ischyrodontidae Scarlato & Starobogatov, 1979 † (2)
- Family Matheriidae Scarlato & Starobogatov, 1979 † (1)
- Family Myodakryotidae Tunnicliff, 1987 † (4)
- 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