Between brackets is the number of accepted marine extant species
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- Biota (247 559)
- Kingdom Animalia (211 523)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 107)
- Phylum Arthropoda (59 755)
- Subphylum Arthropoda incertae sedis (1)
- Subphylum Chelicerata (3 065)
- Subphylum Crustacea (56 607)
- Superclass Allotriocarida (1 851)
- Superclass Multicrustacea (47 800)
- Class Copepoda (11 686)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (34 231)
- Subclass Eumalacostraca (33 661)
- Superorder Eucarida (14 180)
- Order Amphionidacea accepted as Caridea
- Order Decapoda (14 092)
- Suborder Dendrobranchiata (532)
- Suborder Euzygida accepted as Stenopodidea
- Suborder Heterochelida
- Suborder Macrura
- Suborder Pleocyemata (13 560)
- Infraorder Achelata (153)
- Infraorder Anomura (3 316)
- Infraorder Astacidea (72)
- Infraorder Axiidea (600)
- Infraorder Brachyura (5 964)
- Section Cyclodorippoida (110)
- Section Dromiacea (189)
- Section Eubrachyura (5 527)
- Subsection Heterotremata (4 309)
- Superfamily Aethroidea Dana, 1851 (37)
- Superfamily Bellioidea Dana, 1852 (7)
- Superfamily Bythograeoidea Williams, 1980 (16)
- Superfamily Calappoidea De Haan, 1833 (103)
- Superfamily Cancroidea Latreille, 1802 (37)
- Superfamily Carpilioidea Ortmann, 1893 (3)
- Superfamily Cheiragonoidea Ortmann, 1893 (3)
- Superfamily Corystoidea Samouelle, 1819 (9)
- Superfamily Dairoidea Serène, 1965 (4)
- Superfamily Dorippoidea MacLeay, 1838 (100)
- Superfamily Eriphioidea MacLeay, 1838 (67)
- Superfamily Gecarcinucoidea Rathbun, 1904 (3)
- Superfamily Goneplacoidea MacLeay, 1838 (233)
- Superfamily Hexapodoidea Miers, 1886 (44)
- Superfamily Hymenosomatoidea MacLeay, 1838 (118)
- Superfamily Leucosioidea Samouelle, 1819 (516)
- Superfamily Majoidea Samouelle, 1819 (968)
- Family Acanthonychidae Stimpson, 1871 accepted as Epialtidae MacLeay, 1838
- Family Blastidae Stebbing, 1902 accepted as Pisinae Dana, 1851
- Family Epialtidae MacLeay, 1838 (478)
- Subfamily Acanthonychinae Stimpson, 1871 accepted as Epialtidae MacLeay, 1838
- Subfamily Amathinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Chorininae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Criocarcininae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Cyphocarcininae Neumann, 1878 accepted as Pisinae Dana, 1851
- Subfamily Epialtinae MacLeay, 1838 (120)
- Subfamily Hyasteniinae Balss, 1929 accepted as Pisinae Dana, 1851
- Subfamily Ixioninae Neumann, 1878 accepted as Pisinae Dana, 1851
- Subfamily Leptopisinae Stimpson, 1871 accepted as Pisinae Dana, 1851
- Subfamily Libiniinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Macrocoelominae Balss, 1929 accepted as Pisinae Dana, 1851
- Subfamily Menaethinae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Ophthalmiinae Balss, 1929 accepted as Epialtidae MacLeay, 1838
- Subfamily Othoninae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Subfamily Picrocerinae Neumann, 1878 accepted as Epialtidae MacLeay, 1838
- Subfamily Pisinae Dana, 1851 (324)
- Genus Acanthophrys A. Milne-Edwards, 1865 (5)
- Genus Afropisa Muñoz, García-Raso, Gónzalez, Lopes, dos Santos & Cuesta, 2023 (3)
- Genus Amanthia Roux, 1828 accepted as Amathia Roux, 1828
- Genus Anamathia Smith, 1885 (2)
- Genus Apias Rathbun, 1897 (1)
- Genus Apiomithrax Rathbun, 1897 (2)
- Genus Austrolibinia Griffin, 1966 (4)
- Genus Blastia White, 1847 accepted as Pisa Leach, 1814
- Genus Chlorilibinia Lockington, 1877 accepted as Stenocionops Desmarest, 1823
- Genus Chorilia Dana, 1851 (3)
- Genus Chorinus Latreille, 1825 (1)
- Genus Coelocerus A. Milne-Edwards, 1875 (1)
- Genus Cyclocoeloma Miers, 1880 (1)
- Genus Cyphocarcinus A. Milne-Edwards, 1868 (6)
- Genus Delsolaria Garth, 1973 (1)
- Genus Doclea Leach, 1815 (11)
- Genus Garthinia Richer de Forges & Ng, 2009 (1)
- Genus Giranauria Griffin & Tranter, 1986 (3)
- Genus Goniopugettia Ng, Guinot & Davie, 2008
- Genus Goniopugettia Davie & Ng, 2024 (1)
- Genus Guinotinia Richer de Forges & Ng, 2009 (2)
- Genus Herbstia H. Milne Edwards, 1834 (11)
- Genus Holoplites Rathbun, 1894 (1)
- Genus Hoplophrys Henderson, 1893 (1)
- Genus Hoploplites Rathbun, 1894 accepted as Holoplites Rathbun, 1894
- Genus Hyastenus White, 1847 (38)
- Genus Lahaina Dana, 1851 (5)
- Genus Laubierinia Richer de Forges & Ng, 2009 (3)
- Genus Lepidonaxia Targioni Tozzetti, 1877 (1)
- Genus Lepteces Rathbun, 1893 (1)
- Genus Leptomaia Griffin & Tranter, 1986 (1)
- Genus Leptopisa Stimpson, 1871 (3)
- Genus Libidoclaea H. Milne Edwards & Lucas, 1842 (2)
- Genus Libidoclea H. Milne Edwards & Lucas, 1842 accepted as Libidoclaea H. Milne Edwards & Lucas, 1842
- Genus Libinia Leach, 1815 (10)
- Genus Lissa Leach, 1815 accepted as Pisa Leach, 1814
- Genus Loxorhynchus Stimpson, 1857 (3)
- Genus Lyramaia Griffin & Tranter, 1986 (1)
- Genus Macrocoeloma Miers, 1879 (12)
- Genus Micippoides A. Milne-Edwards, 1873 (1)
- Genus Microlissa Pretzmann, 1961 (5)
- Genus Micropisa Stimpson, 1857 (1)
- Genus Nasutocarcinus Tavares, 1991 accepted as Oxypleurodon Miers in Tizard, Moseley, Buchanan & Murray, 1885
- Genus Naxioides A. Milne-Edwards, 1865 (11)
- Genus Neodoclea Buitendijk, 1950 (1)
- Genus Nibilia A. Milne-Edwards, 1878 (2)
- Genus Nicoya Wicksten, 1987 (1)
- Genus Notolopas Stimpson, 1871 (3)
- Genus Oplopisa A. Milne-Edwards, 1878 (1)
- Genus Oxypleurodon Miers in Tizard, Moseley, Buchanan & Murray, 1885 (34)
- Genus Paranaxia Rathbun, 1924 (2)
- Genus Parazewa Balss, 1938 accepted as Acanthophrys A. Milne-Edwards, 1865
- Genus Pelia Bell, 1836 (6)
- Genus Pericera Latreille, 1825 accepted as Stenocionops Desmarest, 1823
- Genus Phalangipus Latreille, 1828 (10)
- Genus Picroceroides Miers, 1886 (1)
- Genus Pisa Leach, 1814 (6)
- Genus Pisoides H. Milne Edwards & Lucas, 1843 (1)
- Genus Pohleus Colavite, Windsor & Santana, 2020 (2)
- Genus Pteromaja Ng & Anker, 2014 (1)
- Genus Pyria Dana, 1851 accepted as Apias Rathbun, 1897
- Genus Rhinocarcinus Richer de Forges & Ng, 2009 (1)
- Genus Rochinia A. Milne-Edwards, 1875 (4)
- Genus Samadinia Ng & Richer de Forges, 2013 (38)
- Genus Scyra Dana, 1851 (7)
- Genus Siderochinia Lee, Richer de Forges & Ng, 2021 (2)
- Genus Solinca Colavite, Windsor & Santana, 2019 (1)
- Genus Sphenocarcinus A. Milne-Edwards, 1875 (1)
- Species Sphenocarcinus agassizi Rathbun, 1894 accepted as Rhinocarcinus agassizi (Rathbun, 1894)
- Species Sphenocarcinus auritus Rathbun, 1916 accepted as Oxypleurodon auritum (Rathbun, 1916)
- Species Sphenocarcinus aurorae Alcock, 1899 accepted as Oxypleurodon aurorae (Alcock, 1899)
- Species Sphenocarcinus bidens Sakai, 1969 accepted as Oxypleurodon bidens (Sakai, 1969)
- Species Sphenocarcinus bipartitus Guinot & Richer de Forges, 1986 accepted as Oxypleurodon bipartitum (Guinot & Richer de Forges, 1986)
- Species Sphenocarcinus carbunculus Rathbun, 1906 accepted as Oxypleurodon carbunculum (Rathbun, 1906)
- Species Sphenocarcinus coralliophilus Takeda, 1980 accepted as Oxypleurodon coralliophilum (Takeda, 1980)
- Species Sphenocarcinus corrosus A. Milne-Edwards, 1875
- Species Sphenocarcinus difficilis Guinot & Richer de Forges, 1985 accepted as Oxypleurodon difficilis (Guinot & Richer de Forges, 1985)
- Species Sphenocarcinus lowryi Richer de Forges, 1992 accepted as Oxypleurodon lowryi (Richer de Forges, 1992)
- Species Sphenocarcinus luzonicus Rathbun, 1916 accepted as Oxypleurodon luzonicum (Rathbun, 1916)
- Species Sphenocarcinus mammatus Guinot & Richer de Forges, 1986 accepted as Oxypleurodon mammatum (Guinot & Richer de Forges, 1986)
- Species Sphenocarcinus nodosus Rathbun, 1916 accepted as Laubierinia nodosa (Rathbun, 1916)
- Species Sphenocarcinus orbiculatus Guinot & Richer de Forges, 1986 accepted as Oxypleurodon orbiculatum (Guinot & Richer de Forges, 1986)
- Species Sphenocarcinus pinocchio Guinot & Richer de Forges, 1985 accepted as Oxypleurodon pinocchio (Guinot & Richer de Forges, 1985)
- Species Sphenocarcinus stimpsoni (Miers in Tizard, Moseley, Buchanan & Murray, 1885) accepted as Oxypleurodon stimpsoni Miers in Tizard, Moseley, Buchanan & Murray, 1885
- Species Sphenocarcinus stuckiae Guinot & Richer de Forges, 1986 accepted as Oxypleurodon stuckiae (Guinot & Richer de Forges, 1986)
- Genus Stegopleurodon Richer de Forges & Ng, 2009 (2)
- Genus Stenocinops Desmarest, 1823 accepted as Stenocionops Desmarest, 1823
- Genus Stenocionops Desmarest, 1823 (8)
- Genus Stratiolibinia Tavares & Santana, 2011 (2)
- Genus Thusaenys Griffin & Tranter, 1986 (6)
- Genus Tiarinia Dana, 1851 (14)
- Genus Trachymaia A. Milne-Edwards, 1880 (1)
- Genus Tunepugettia Ng, Komai & Sato, 2017 (2)
- Genus Tylocarcinus Miers, 1879 (5)
- Subfamily Pliosomatinae Števčić, 1994 accepted as Epialtidae MacLeay, 1838 (1)
- Subfamily Pyrinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Stenociopinae Dana, 1851 accepted as Pisinae Dana, 1851
- Subfamily Tychinae Dana, 1851 (16)
- Genus Chimaerodinia Richer de Forges, Lee & Ng, 2021 (1)
- Genus Crocydocinus Lee, Richer de Forges & Ng, 2019 (9)
- Genus Dehaanius MacLeay, 1838 accepted as Acanthonyx Latreille, 1828
- Genus Minyorhyncha Tavares & Santana, 2018 (1)
- Genus Neophrys Lee, Richer de Forges & Ng, 2019 (2)
- Genus Scyramathia A. Milne-Edwards, 1880 (4)
- Family Eurypodiidae MacLeay, 1838 accepted as Inachinae MacLeay, 1838
- Family Huenidae MacLeay, 1838 accepted as Epialtidae MacLeay, 1838
- Family Inachidae MacLeay, 1838 (147)
- Family Inachoididae Dana, 1851 (43)
- Family Leptopodiadae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Leptopodidae Bell, 1836 accepted as Inachinae MacLeay, 1838
- Family Leptopodiidae Bell, 1836 accepted as Leptopodidae Bell, 1836
- Family Macrocheiridae Dana, 1851 (1)
- Family Macropodiadae Samouelle, 1819 accepted as Inachinae MacLeay, 1838
- Family Maïadae Samouelle, 1819 accepted as Majinae Samouelle, 1819
- Family Majidae Samouelle, 1819 (155)
- Family Mamaiidae Stebbing, 1905 accepted as Majinae Samouelle, 1819
- Family Mithracidae MacLeay, 1838 (60)
- Family Oncinopodidae Stimpson, 1857 accepted as Inachidae MacLeay, 1838
- Family Oregoniidae Garth, 1958 (84)
- Family Periceridae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Pisidae Dana, 1851 accepted as Pisinae Dana, 1851
- Family Tychidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Family Tychiidae Dana, 1851 accepted as Epialtidae MacLeay, 1838
- Superfamily Orithyioidea Dana, 1852 (1)
- Superfamily Palicoidea Bouvier, 1898 (69)
- Superfamily Parthenopoidea MacLeay, 1838 (148)
- Superfamily Pilumnoidea Samouelle, 1819 (440)
- Superfamily Portunoidea Rafinesque, 1815 (476)
- Superfamily Potamoidea Ortmann, 1896 (12)
- Superfamily Pseudocarcinoidea Ng & Davie, 2020 (1)
- Superfamily Pseudozioidea Alcock, 1898 (27)
- Superfamily Retroplumoidea Gill, 1894 (10)
- Superfamily Thioidea Dana, 1852 accepted as Thiidae Dana, 1852
- Superfamily Trapezioidea Miers, 1886 (58)
- Superfamily Trichodactyloidea H. Milne Edwards, 1853
- Superfamily Trichopeltarioidea Tavares & Cleva, 2010 (29)
- Superfamily Xanthoidea MacLeay, 1838 (770)
- Subsection Thoracotremata (1 218)
- Section Homoloida (91)
- Section Podotremata accepted as Brachyura
- Section Raninoida (47)
- Family Brachyura incertae sedis
- Genus Zoea Bosc, 1801
- Infraorder Callianassidea accepted as Axiidea
- Infraorder Caridea (3 057)
- Infraorder Gebiidea (252)
- Infraorder Glypheidea (2)
- Infraorder Polychelida (38)
- Infraorder Procarididea (6)
- Infraorder Stenopodidea (100)
- Suborder Trichelida
- Order Euphausiacea (88)
- Superorder Peracarida (19 477)
- Superorder Syncarida (4)
- Subclass Hoplocarida (503)
- Subclass Phyllocarida (67)
- Class Tantulocarida (39)
- Class Thecostraca (1 844)
- Superclass Oligostraca (6 956)
- Class Maxillopoda
- Subphylum Myriapoda (82)
- Subphylum Pancrustacea accepted as Crustacea
- Subphylum Tetraconata accepted as Crustacea
- Phylum Aschelminthes
- Phylum Brachiopoda (408)
- Phylum Bryozoa (6 533)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (132)
- Phylum Chordata (24 096)
- Phylum Cnidaria (12 578)
- 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 (52 044)
- Phylum Nematoda (6 758)
- Phylum Nematomorpha (5)
- Phylum Nemertea (1 334)
- 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 (13 497)
- 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)
