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 (247 224)
- Kingdom Animalia (211 202)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (516)
- Phylum Annelida (14 065)
- Phylum Arthropoda (59 644)
- 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 (52 006)
- Phylum Nematoda (6 756)
- Phylum Nematomorpha (6)
- Phylum Nemertea (1 340)
- 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)
- Subphylum Catenulida (16)
- Subphylum Platyhelminthes incertae sedis (4)
- Subphylum Rhabditophora (13 479)
- Superclass Neodermata (10 338)
- Class Cestoda (1 844)
- Class Monogenea (2 708)
- Class Monogenoidea represented as Monogenea
- Class Monopisthocotyla
- Class Polyopisthocotyla
- Class Trematoda (5 786)
- Subclass Aspidobothria accepted as Aspidogastrea
- Subclass Aspidocotylea accepted as Aspidogastrea
- Subclass Aspidogastrea (18)
- Subclass Digenea (5 768)
- Order Azygiida accepted as Azygioidea Lühe, 1909
- Order Bucephalidida accepted as Bucephalata
- Order Digenea incertae sedis (191)
- Order Diplostomida (332)
- Order Echinostomida accepted as Plagiorchiida
- Order Faustulida accepted as Plagiorchiida
- Order Plagiorchiida (5 245)
- Suborder Allocreadiata accepted as Xiphidiata
- Suborder Apocreadiata (78)
- Suborder Bivesiculata (33)
- Suborder Bucephalata (328)
- Suborder Didymozoata accepted as Hemiurata
- Suborder Echinostomata (294)
- Suborder Faustulata accepted as Xiphidiata
- Suborder Gasterostomata accepted as Bucephalata
- Suborder Gymnophallata (219)
- Suborder Haploporata (146)
- Suborder Haplosplanchnata (51)
- Suborder Hemiurata (1 055)
- Superfamily Azygioidea Lühe, 1909 (12)
- Superfamily Hemiuroidea Looss, 1899 (1 043)
- Epifamily Sclerodistomatidae Dolfus, 1932 accepted as Sclerodistomidae Odhner, 1927
- Family Accacoeliidae Odhner, 1911 (25)
- Family Aerobiotrematidae Yamaguti, 1958 accepted as Dictysarcidae Skrjabin & Guschanskaja, 1955
- Family Bathycotylidae Dollfus, 1932 (1)
- Family Bhaleraoiidae Srivastava, 1949 accepted as Sclerodistomidae Odhner, 1927
- Family Biporidae Malhotra, Nanda, Mukherjee, Ghosh, Sukul & Capoor, 1989 accepted as Hemiuridae Looss, 1899
- Family Botulidae Guiart, 1938 accepted as Hirudinellidae Dollfus, 1932
- Family Bunocotylidae Dollfus, 1950 (84)
- Family Cylindrorchiidae Poche, 1926 accepted as Dictysarcidae Skrjabin & Guschanskaja, 1955
- Family Derogenidae Nicoll, 1910 (54)
- Family Dictysarcidae Skrjabin & Guschanskaja, 1955 (8)
- Family Didymoclinidae Pozdnyakov, 1993 accepted as Didymozoidae Monticelli, 1888
- Family Didymodiclinidae Pozdnyakov, 1994 accepted as Didymozoidae Monticelli, 1888
- Family Didymozoidae Monticelli, 1888 (265)
- Family Dinuridae Looss, 1907 accepted as Hemiuridae Looss, 1899
- Family Dinuridae Skrjabin & Guschanskaja, 1954 accepted as Hemiuridae Looss, 1899
- Family Elytrophallidae Skrjabin & Guschanskaja, 1955 accepted as Hemiuridae Looss, 1899
- Family Gonocercidae Skrjabin & Guschanskaja, 1955 (19)
- Family Hemiuridae Looss, 1899 (417)
- Family Hirudinellidae Dollfus, 1932 (5)
- Subfamily Profundiellinae Skrjabin, 1958 accepted as Hirudinellidae Dollfus, 1932
- Genus Botulus Guiart, 1938 (1)
- Genus Hirudinella de Blainville, 1828 (3)
- Species Hirudinella ahi Yamaguti, 1970
- Species Hirudinella ampullacea (Buttel-Reepen, 1900) Skrjabin & Guschanskaja, 1957 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella beebei Chandler, 1937 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella bonnacouri Guiart, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella clavata (Menzies, 1791) de Blainville, 1828 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella fusca (Bosc, 1802) Manter, 1926 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella ingens (Moniez, 1886) Darr, 1902 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella marina Garcin, 1730 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella oxysoma Guiart, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella pallasii (Poirier, 1885) Guiart, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella phalloidea Guiart, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella poirieri (Moniez, 1891) Dollfus, 1935 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella siemersi (Buttel-Reepen, 1900) Skrjabin & Guschanskaja, 1959 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella spinulosa Yamaguti, 1938 accepted as Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella ventricosa (Pallas, 1774) Baird, 1853
- Species Hirudinella xishaensis Gu, 1985
- Genus Hirudinelloides Gaevskaja & Kovaleva, 1977 accepted as Lampritrema Yamaguti, 1940
- Genus Lampritrema Yamaguti, 1940 (1)
- Genus Mediolecithus Oshmarin, 1968 accepted as Botulus Guiart, 1938
- Genus Profundiella Skrjabin, 1958 accepted as Botulus Guiart, 1938
- Genus Uroproctinella Skrjabin & Guschanskaja, 1957 accepted as Hirudinella de Blainville, 1828
- Family Lampritrematidae Skrjabin & Guschanskaja, 1955 accepted as Hirudinellidae Dollfus, 1932
- Family Lecithasteridae Odhner, 1905 (101)
- Family Lecithochiriidae Lühe, 1901 accepted as Hemiuridae Looss, 1899
- Family Lecithochiriidae Skrjabin & Guschanskaja, 1954 accepted as Hemiuridae Looss, 1899
- Family Lobatovitelliovariidae Yamaguti, 1965 accepted as Prolecithinae Yamaguti, 1971
- Family Lobatovitellovariidae Yamaguti, 1965 accepted as Lecithasteridae Odhner, 1905
- Family Mabiaramidae Teixeira de Freitas & Kohn, 1967 accepted as Sclerodistomidae Odhner, 1927
- Family Mediolecithidae Oshmarin, 1968 accepted as Hirudinellidae Dollfus, 1932
- Family Paraccacladiidae Bray & Gibson, 1977 (2)
- Family Pelorohelminthidae Fischthal & Thomas, 1968 accepted as Dictysarcidae Skrjabin & Guschanskaja, 1955
- Family Prosogonotrematidae Vigueras, 1940 accepted as Sclerodistomidae Odhner, 1927
- Family Ptychogonimidae Dollfus, 1937 (2)
- Family Sclerodistomidae Odhner, 1927 (47)
- Family Sclerodistomoididae Gibson & Bray, 1979 (1)
- Family Syncoeliidae Looss, 1899 (12)
- Subfamily Gigantogorgoderinae Machida & Kuramochi, 1994 accepted as Gonocercidae Skrjabin & Guschanskaja, 1955
- Subfamily Lampritrematinae Yamaguti, 1940 accepted as Hirudinellidae Dollfus, 1932
- Suborder Heterophyata accepted as Opisthorchiata
- Suborder Lepocreadiata (475)
- Suborder Monorchiata (288)
- Suborder Notocotylata accepted as Pronocephalata
- Suborder Opisthorchiata (400)
- Suborder Pronocephalata (200)
- Suborder Transversotremata (35)
- Suborder Xiphidiata (1 643)
- Suborder Zoogonata accepted as Xiphidiata
- Order Strigeida accepted as Diplostomida
- Order Strigeidida accepted as Diplostomida
- Suborder Azygiata accepted as Azygioidea Lühe, 1909
- Superorder Macrostomorpha (172)
- Order Bothrioplanida (1)
- Order Fecampiida (16)
- Order Gnosonesimida (6)
- Order Polycladida (1 082)
- Order Prolecithophora (175)
- Order Proseriata (499)
- Order Rhabdocoela (1 105)
- Order Tricladida (85)
- Class Turbellaria
- 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 (20 780)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 578)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)