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 (247 220)
- Kingdom Animalia (211 198)
- Subkingdom Animalia incertae sedis
- Subkingdom Metazoa accepted as Animalia
- Phylum Acanthocephala (517)
- Phylum Annelida (14 064)
- 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 (52 005)
- Phylum Nematoda (6 756)
- Class Adenophorea
- Class Chromadorea (4 945)
- Subclass Chromadoria (4 945)
- Order Aphelenchida accepted as Aphelenchoidea Fuchs, 1937
- Order Araeolaimida (522)
- Order Ascaridida accepted as Ascaridomorpha
- Order Benthimermithida accepted as Plectida
- Order Chromadorida (805)
- Order Desmodorida (818)
- Order Desmoscolecida (314)
- Order Monhysterida (925)
- Order Plectida (417)
- Order Rhabditida (1 144)
- Suborder Camallanina accepted as Spirurina
- Suborder Rhabditina (78)
- Suborder Spirurina (1 025)
- Infraorder Ascaridomorpha (439)
- Infraorder Gnathostomatomorpha (13)
- Infraorder Rhigonematomorpha
- Infraorder Spirurina incertae sedis (200)
- Infraorder Spiruromorpha (373)
- Superfamily Acuarioidea Railliet, Henry & Sisoff, 1912 (60)
- Superfamily Aproctoidea Skrjabin & Shikhobalova, 1945 (5)
- Family Aproctidae Skrjabin & Shikhobalova, 1945 (1)
- Family Desmidocercidae Cram, 1927 (4)
- Genus Desmidocerca Skrjabin, 1916
- Genus Desmidocercella Yorke & Maplestone, 1926 (1)
- Genus Diomedenema Johnston & Mawson, 1952 (3)
- Species Diomedenema dinarctos Presswell & Bennett, 2021
- Species Diomedenema diomedeae Johnston & Mawson, 1952
- Species Diomedenema tavaresi Knoff, Santos, Giese, Gomes & Silva-Souza, 2018
- Superfamily Camallanoidea Travassos, 1920 (88)
- Superfamily Filarioidea Chabaud & Anderson, 1959 (16)
- Superfamily Habronematoidea Ivaschkin, 1961 (134)
- Superfamily Physalopteroidea Railliet, 1893 (38)
- Superfamily Rictularoidea Railliet, 1916
- Superfamily Spiruroidea Oerley, 1885
- Superfamily Thelazioidea Skrjabin, 1915 (32)
- Suborder Tylenchina (41)
- Order Spirurida accepted as Rhabditida
- Order Strongylida accepted as Rhabditida
- Order Tylenchida accepted as Tylenchomorpha
- Class Enoplea (1 801)
- Class Nematoda incertae sedis (10)
- Class Secernentea
- Phylum Nematomorpha (6)
- Phylum Nemertea (1 339)
- 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 (20 780)
- Kingdom Fungi (1 432)
- Kingdom Monera represented as Bacteria
- Kingdom Plantae (10 578)
- Kingdom Protozoa (766)
- Kingdom Viruses (115)