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 (247 538)
- Kingdom Animalia (211 503)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 105)
- Phylum Arthropoda (59 754)
- Phylum Aschelminthes
- Phylum Brachiopoda (408)
- Phylum Bryozoa (6 539)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (132)
- Phylum Chordata (24 095)
- Phylum Cnidaria (12 578)
- Subphylum Anthozoa (7 266)
- Subphylum Cnidaria incertae sedis (1)
- Subphylum Endocnidozoa (1 151)
- Subphylum Medusozoa (4 160)
- Class Cubomedusae accepted as Cubozoa
- Class Cubozoa (51)
- Class Hydrozoa (3 815)
- Subclass Automedusae accepted as Trachylinae
- Subclass Hydroidolina (3 667)
- Subclass Leptolida accepted as Hydroidolina
- Subclass Leptolinae accepted as Hydroidolina
- Subclass Stylasterina accepted as Hydroidolina
- Subclass Trachylinae (148)
- Infraclass Thalassanthae accepted as Narcomedusae
- Order Actinulida (15)
- Order Limnomedusae (40)
- Suborder Limnopolypae accepted as Limnomedusae
- Family Armorhydridae Swedmark & Teissier, 1958 (1)
- Family Geryonidae Eschscholtz, 1829 accepted as Geryoniidae Eschscholtz, 1829
- Family Geryoniidae Eschscholtz, 1829 (2)
- Family Limnomedusae incertae sedis (1)
- Family Microhydrulidae Bouillon & Deroux, 1967 (2)
- Family Monobrachiidae Mereschkowsky, 1877 (3)
- Genus Monobrachium Mereschkowsky, 1877 (3)
- Family Olindiadidae accepted as Olindiidae Haeckel, 1879
- Family Olindiasidae Haeckel, 1879 accepted as Olindiidae Haeckel, 1879
- Family Olindididae accepted as Olindiidae Haeckel, 1879
- Family Olindiidae Haeckel, 1879 (31)
- Order Narcomedusae (44)
- Order Trachomedusae accepted as Trachymedusae
- Order Trachymedusae (49)
- Infraclass Hydroidomedusae accepted as Hydroidolina
- Order Hydroida accepted as Hydroidolina
- Order Milleporina accepted as Hydroidolina
- Order Trachylina accepted as Trachylinae
- Class Scyphomedusae accepted as Scyphozoa
- Class Scyphozoa (243)
- Class Staurozoa (51)
- Phylum Ctenophora (184)
- Phylum Cycliophora (2)
- Phylum Dicyemida (122)
- Phylum Echinodermata (7 644)
- 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 (52 039)
- Phylum Nematoda (6 758)
- Phylum Nematomorpha (5)
- Phylum Nemertea (1 332)
- 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 (13 493)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (9 470)
- Phylum Priapulida (22)
- Phylum Rotatoria accepted as Rotifera
- Phylum Rotifera (208)
- Phylum Sipunculida accepted as Sipuncula
- Phylum Tardigrada (263)
- Phylum Xenacoelomorpha (437)
- Kingdom Archaea (117)
- Kingdom Bacteria (2 223)
- Kingdom Chromista (20 790)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 581)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)
