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
The last expanded taxon is highlighted
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- Biota (247 578)
- Kingdom Animalia (211 542)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 107)
- Phylum Arthropoda (59 758)
- Subphylum Arthropoda incertae sedis (1)
- Subphylum Chelicerata (3 065)
- Subphylum Crustacea (56 610)
- Superclass Allotriocarida (1 851)
- Superclass Multicrustacea (47 802)
- Class Copepoda (11 686)
- Class Hexanauplia accepted as Thecostraca
- Class Malacostraca (34 233)
- Subclass Eumalacostraca (33 663)
- Superorder Eucarida (14 181)
- Superorder Peracarida (19 478)
- Order Amphipoda (8 449)
- Order Anisopoda accepted as Tanaidacea
- Order Bochusacea (5)
- Order Cumacea (1 770)
- Order Ingolfiellida (33)
- Order Isopoda (6 317)
- Order Lophogastrida (53)
- Order Mictacea (1)
- Order Mysida (1 215)
- Order Mysidacea accepted as Mysida
- Order Stygiomysida (10)
- Order Tanaidacea (1 587)
- Suborder Apseudomorpha (552)
- Suborder Dikonophora accepted as Tanaidomorpha
- Suborder Monokonophora accepted as Apseudoidea Leach, 1814
- Suborder Neotanaidomorpha accepted as Neotanaoidea Sieg, 1980
- Suborder Tanaidomorpha (1 035)
- Superfamily Neotanaoidea Sieg, 1980 (51)
- Superfamily Paratanaoidea Lang, 1949 (885)
- Family Agathotanaidae Lang, 1971 (61)
- Family Akanthophoreidae Sieg, 1986 (56)
- Family Anarthruridae Lang, 1971 (29)
- Family Caudalongidae Błażewicz & Bird in Błażewicz, Jakiel, Bird & Studzian, 2024 (12)
- Family Colletteidae Larsen & Wilson, 2002 (56)
- Family Cryptocopidae Sieg, 1977 (11)
- Family Hamatipedidae Błażewicz, Gellert & Bird, 2022 (10)
- Family Heterotanoididae Bird, 2012 (5)
- Family Leptocheliidae Lang, 1973 (138)
- Family Leptognathiidae Sieg, 1976 (35)
- Family Mirandotanaidae Błażewicz-Paszkowycz & Bamber, 2009 (4)
- Family Nototanaidae Sieg, 1976 (16)
- Family Paranarthrurellidae Błażewicz, Jóźwiak & Frutos, 2019 (17)
- Family Paratanaidae Lang, 1949 (59)
- Family Paratanaoidea incertae sedis (49)
- Family Pseudotanaidae Sieg, 1976 (95)
- Family Pseudozeuxidae Sieg, 1982 (4)
- Family Tanaellidae Larsen & Wilson, 2002 (51)
- Family Tanaissuidae Bird & Larsen, 2009 (12)
- Family Tanaopsidae Błażewicz-Paszkowycz & Bamber, 2012 (17)
- Family Teleotanaidae Bamber, 2008 (4)
- Subfamily Teleotanaidinae Bamber, 2008 accepted as Teleotanaidae Bamber, 2008 (4)
- Genus Teleotanais Lang, 1956 (4)
- Family Typhlotanaidae Sieg, 1984 (144)
- Superfamily Tanaidoidea Nobili, 1906 (99)
- Superfamily Tanaoidea Dana, 1849 accepted as Tanaidoidea Nobili, 1906
- Order Thermosbaenacea (38)
- Superorder Syncarida (4)
- Subclass Hoplocarida (503)
- Subclass Phyllocarida (67)
- Class Tantulocarida (39)
- Class Thecostraca (1 844)
- Superclass Oligostraca (6 957)
- Class Maxillopoda
- Subphylum Myriapoda (82)
- Subphylum Pancrustacea accepted as Crustacea
- Subphylum Tetraconata accepted as Crustacea
- Phylum Aschelminthes
- Phylum Brachiopoda (408)
- Phylum Bryozoa (6 545)
- 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 (52 040)
- Phylum Nematoda (6 758)
- 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 (13 497)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (9 475)
- 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)
