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 (247 219)
- Kingdom Animalia (211 198)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (517)
- Phylum Annelida (14 063)
- Phylum Arthropoda (59 642)
- Phylum Aschelminthes
- Phylum Brachiopoda (407)
- Phylum Bryozoa (6 528)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (132)
- Phylum Chordata (24 075)
- Phylum Cnidaria (12 560)
- Phylum Ctenophora (184)
- Phylum Cycliophora (2)
- Phylum Dicyemida (122)
- Phylum Echinodermata (7 626)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta (201)
- Phylum Gastrotricha (522)
- Phylum Gnathostomulida (100)
- Phylum Hemichordata (133)
- Phylum Kinorhyncha (348)
- Phylum Loricifera (46)
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (52 004)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (8 553)
- Class Caudofoveata (143)
- Class Cephalopoda (859)
- Class Conchifera accepted as Bivalvia
- Class Gastropoda (40 434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (26 410)
- Subclass Heterobranchia (8 987)
- Infraclass "Lower Heterobranchia" (377)
- Infraclass Euthyneura (8 532)
- Subterclass Acteonimorpha (246)
- Subterclass Ringipleura (2 821)
- Superorder Nudipleura (2 737)
- Order Notaspidea accepted as Pleurobranchomorpha
- Order Nudibranchia (2 645)
- Suborder Aeolidina accepted as Cladobranchia
- Suborder Anthobranchia accepted as Doridina
- Suborder Cladobranchia (1 090)
- Infraorder Pseudoeuctenidiacea accepted as Doridoxoidea Bergh, 1899
- Parvorder Aeolidida accepted as Aeolidioidea Gray, 1827
- Parvorder Dendronotida accepted as Dendronotoidea Allman, 1845
- Parvorder Dendronotina accepted as Dendronotoidea Allman, 1845
- Parvorder Euarminida accepted as Arminoidea Iredale & O'Donoghue, 1923 (1841)
- Section Acleioprocta accepted as Fionoidea Gray, 1857
- Section Cleioprocta accepted as Aeolidioidea Gray, 1827
- Section Pleuroprocta accepted as Flabellinoidea Bergh, 1889
- Superfamily Aeolidiacea accepted as Aeolidioidea Gray, 1827
- Superfamily Aeolidioidea Gray, 1827 (338)
- Family Aeolidiidae Gray, 1827 (90)
- Family Babakinidae Roller, 1973 (4)
- Family Facelinidae Bergh, 1889 (143)
- Family Favorinidae Bergh, 1889 accepted as Facelinidae Bergh, 1889
- Family Flabellinidae Bergh, 1889 (38)
- Family Flabellinopsidae Korshunova, Martynov, Bakken, Evertsen, Fletcher, Mudianta, Saito, Lundin, Schrödl & Picton, 2017 (2)
- Family Glaucidae Gray, 1827 (5)
- Genus Glaucilla Bergh, 1861 (4)
- Genus Glaucus Forster, 1777 (1)
- Family Myrrhinidae Bergh, 1905 (45)
- Family Notaeolidiidae Eliot, 1910 (3)
- Family Piseinotecidae Edmunds, 1970 (6)
- Family Pleurolidiidae Burn, 1966 (2)
- Family Protaeolidiellidae Odhner, 1968 accepted as Pleurolidiidae Burn, 1966
- Superfamily Arminoidea Iredale & O'Donoghue, 1923 (1841) (102)
- Superfamily Cladobranchia incertae sedis (7)
- Superfamily Dendronotoidea Allman, 1845 (196)
- Superfamily Doridoxoidea Bergh, 1899 (2)
- Superfamily Fionoidea Gray, 1857 (305)
- Superfamily Flabellinoidea Bergh, 1889 accepted as Fionoidea Gray, 1857
- Superfamily Proctonotoidea Gray, 1853 (49)
- Superfamily Tritonioidea Lamarck, 1809 (91)
- Suborder Cladohepatica accepted as Cladobranchia
- Suborder Dexiarchia accepted as Cladobranchia
- Suborder Doridina (1 554)
- Suborder Euctenidiacea accepted as Doridina
- Suborder Holohepatica accepted as Doridina
- Suborder Nudibranchia incertae sedis (1)
- Order Pleurobranchida (92)
- Genus Abranchus [sic] accepted as Abrancha van Hasselt, 1824
- Genus Spongiodoris Pruvot-Fol, 1933
- Superorder Ringiculimorpha (84)
- Order Pleurobranchomorpha accepted as Pleurobranchida
- Genus Abrancha van Hasselt, 1824
- Subterclass Tectipleura (5 465)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis
- Infraclass Mesoneura (78)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones (123)
- Subclass Neritimorpha (242)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (360)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (4 312)
- 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 (1 087)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Scaphopoda (581)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (312)
- Subclass Chaetodermomorpha accepted as Caudofoveata
- Phylum Nematoda (6 756)
- Phylum Nematomorpha (6)
- Phylum Nemertea (1 341)
- 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 (9 437)
- Phylum Priapulida (22)
- Phylum Rotatoria accepted as Rotifera
- Phylum Rotifera (184)
- Phylum Sipunculida accepted as Sipuncula
- Phylum Tardigrada (263)
- Phylum Xenacoelomorpha (437)
- Kingdom Archaea (117)
- Kingdom Bacteria (2 223)
- Kingdom Chromista (20 779)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 578)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)