Between brackets is the number of accepted marine extant species
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Shows the number of accepted marine extant species within the taxon
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- Biota (247 591)
- Kingdom Animalia (211 555)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 112)
- Phylum Arthropoda (59 761)
- Phylum Aschelminthes
- Phylum Brachiopoda (408)
- Phylum Bryozoa (6 532)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (132)
- Phylum Chordata (24 096)
- Phylum Cnidaria (12 585)
- Phylum Ctenophora (184)
- Phylum Cycliophora (2)
- Phylum Dicyemida (122)
- Phylum Echinodermata (7 646)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta (202)
- Phylum Gastrotricha (523)
- Phylum Gnathostomulida (100)
- Phylum Hemichordata (137)
- Phylum Kinorhyncha (348)
- Phylum Loricifera (46)
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (52 060)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (8 546)
- Subclass Autobranchia (7 801)
- Infraclass Heteroconchia (5 675)
- Subterclass Archiheterodonta (411)
- Subterclass Euheterodonta (5 251)
- Superorder Anomalodesmata (800)
- Superorder Imparidentia (4 451)
- Order Adapedonta (159)
- Order Cardiida (1 246)
- Superfamily Cardioidea Lamarck, 1809 (297)
- Family Adacnidae Gill, 1871 accepted as Adacnini Gill, 1871
- Family Cardiidae Lamarck, 1809 (297)
- Subfamily Cardiidae incertae sedis (3)
- Subfamily Cardiinae Lamarck, 1809 (37)
- Subfamily Cerastodermatinae F. Nordsieck, 1969 accepted as Cerastodermatini F. Nordsieck, 1969
- Subfamily Clinocardiinae Kafanov, 1975 (9)
- Subfamily Fraginae R. B. Stewart, 1930 (39)
- Subfamily Goethemiinae M. Huber, 2010 accepted as Lymnocardiinae Stoliczka, 1870
- Subfamily Hypaninae Starobogatov, 1970 accepted as Adacnini Gill, 1871
- Subfamily Laevicardiinae Keen, 1951 (17)
- Subfamily Lymnocardiinae Stoliczka, 1870 (44)
- Subfamily Nemocardiinae ter Poorten, 2023 (39)
- Genus Decussicardium Fischer-Piette, 1977 accepted as Microcardium Keen, 1937
- Genus Frigidocardium T. Habe, 1951 (10)
- Genus Keenaea T. Habe, 1951 (2)
- Genus Lophocardium P. Fischer, 1887 (2)
- Genus Microcardium Keen, 1937 (17)
- Genus Nemocardium Meek, 1876 (5)
- Subgenus Nemocardium (Keenaea) T. Habe, 1951 accepted as Keenaea T. Habe, 1951
- Subgenus Nemocardium (Microcardium) Keen, 1937 accepted as Microcardium Keen, 1937
- Subgenus Nemocardium (Nemocardium) Meek, 1876 accepted as Nemocardium Meek, 1876
- Subgenus Nemocardium (Pratulum) Iredale, 1924 accepted as Pratulum Iredale, 1924
- Species Nemocardium australojaponicum ter Poorten, 2013
- Species Nemocardium bechei (Reeve, 1847)
- Species Nemocardium centifilosum (P. P. Carpenter, 1864) accepted as Keenaea centifilosa (P. P. Carpenter, 1864)
- Species Nemocardium enigmaticum ter Poorten, 2013
- Species Nemocardium exasperatum (G. B. Sowerby II, 1839) accepted as Cardium exasperatum G. B. Sowerby II, 1839
- Species Nemocardium fulvum ter Poorten, 2013
- Species Nemocardium lyratum (G. B. Sowerby II, 1840) accepted as Lyrocardium lyratum (G. B. Sowerby II, 1840)
- Species Nemocardium pazianum (Dall, 1916) accepted as Microcardium pazianum (Dall, 1916)
- Species Nemocardium peramabile (Dall, 1881) accepted as Microcardium peramabile (Dall, 1881)
- Species Nemocardium probatum (Iredale, 1927)
- Species Nemocardium richardsoni (Whiteaves, 1878) accepted as Nemocardium (Keenaea) centifilosum (P. P. Carpenter, 1864)
- Species Nemocardium thaanumi (Pilsbry, 1921) accepted as Frigidocardium thaanumi (Pilsbry, 1921)
- Species Nemocardium tinctum (Dall, 1881) accepted as Microcardium tinctum (Dall, 1881)
- Species Nemocardium torresi (E. A. Smith, 1885) accepted as Frigidocardium torresi (E. A. Smith, 1885)
- Species Nemocardium transversum (Rehder & Abbott, 1951) accepted as Microcardium tinctum (Dall, 1881)
- Genus Pratulum Iredale, 1924 (3)
- Genus Trifaricardium Kuroda & T. Habe, 1951 accepted as Frigidocardium T. Habe, 1951
- Subfamily Orthocardiinae J. A. Schneider, 2002 (9)
- Subfamily Trachycardiinae R. B. Stewart, 1930 (88)
- Subfamily Tridacninae Lamarck, 1819 (12)
- 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 Trigonocardia [sic] accepted as Trigoniocardia Dall, 1900
- Family Clinocardiidae Kafanov, 1975 accepted as Clinocardiinae Kafanov, 1975
- Family Fragidae R. B. Stewart, 1930 accepted as Fraginae R. B. Stewart, 1930
- Family Lymnocardiidae Stoliczka, 1870 accepted as Lymnocardiinae Stoliczka, 1870
- Family Tridacnidae Lamarck, 1819 accepted as Tridacninae Lamarck, 1819
- Superfamily Tellinoidea Blainville, 1814 (949)
- Order Galeommatida (604)
- Order Gastrochaenida (32)
- Order Hiatellida represented as Adapedonta
- Order Lucinida (527)
- Order Myacea accepted as Myida
- Order Myida (358)
- Order Sphaeriida (1)
- Order Venerida (1 454)
- Superfamily Cyamioidea G. O. Sars, 1878 (69)
- Superfamily Gaimardioidea Hedley, 1916 accepted as Cyamioidea G. O. Sars, 1878
- Superfamily Grammysioidea S. A. Miller, 1877 † (1)
- Order Anomalodesmacea accepted as Anomalodesmata
- Order Euheterodonta incertae sedis
- Order Pholadomyida represented as Anomalodesmata
- Subterclass Heterodonta
- Subterclass Palaeoheterodonta (13)
- Infraclass Pteriomorphia (2 126)
- Subclass Bivalvia incertae sedis (1)
- Subclass Palaeotaxodonta accepted as Nuculida
- Subclass Protobranchia (744)
- Class Caudofoveata (143)
- Class Cephalopoda (859)
- Class Conchifera accepted as Bivalvia
- Class Gastropoda (40 498)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (4)
- Class Monoplacophora (31)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 085)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Scaphopoda (581)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
- Phylum Nematoda (6 754)
- Phylum Nematomorpha (5)
- Phylum Nemertea (1 335)
- Phylum Nemertina represented as Nemertea
- Phylum Nemertini accepted as Nemertea
- Phylum Orthonectida (24)
- Phylum Pentastomida accepted as Pentastomida
- Phylum Phoronida (13)
- Phylum Placozoa (4)
- Phylum Platyhelminthes (13 499)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (9 468)
- Phylum Priapulida (22)
- Phylum Rotatoria accepted as Rotifera
- Phylum Rotifera (219)
- Phylum Sipunculida accepted as Sipuncula
- Phylum Tardigrada (263)
- Phylum Xenacoelomorpha (437)
- Kingdom Archaea (117)
- Kingdom Bacteria (2 223)
- Kingdom Chromista (20 791)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 581)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)
