Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Class Cestoda
- Class Platyhelminthes (awaiting allocation)
- Class Platyhelminthes incertae sedis
- Class Trematoda
- Class Turbellaria
- Order Catenulida
- Order Eukalyptorhynchia (awaiting allocation)
- Order Haplopharyngida
- Order Kalyptorhynchia (awaiting allocation)
- Order Lecithoepitheliata
- Order Macrostomida
- Order Neorhabdocoela
- Order Polycladida
- Order Prolecithophora
- Order Proplicastomata
- Order Proseriata
- Order Rhabdocoela
- Family Acrumenidae Karling, 1980 accepted as Cicerinidae Meixner, 1928
- Family Actinodactylellidae Benham, 1901
- Family Cheliplanidae Schilke, 1970
- Family Crassicollidae Dean, 1977
- Family Gyratricidae Graff, 1905
- Family Kalyptorhynchia incertae sedis
- Family Koinocystididae Meixner, 1924
- Family Luridae Sterrer & Rieger, 1990
- Family Nannorhynchididae Evdonin, 1977
- Family Polycystididae Graff, 1905
- Genus Acrorhynchides Strand, 1928
- Genus Acrorhynchus Graff, 1882 accepted as Acrorhynchides Strand, 1928
- Genus Albertorhynchus Schockaert, 1976
- Genus Alcha Marcus, 1949
- Genus Alchoides Willems, Schockaert & Artois, 2006
- Genus Ametochus Willems, Schockaert & Artois, 2006
- Genus Annalisella Karling, 1978
- Genus Annulorhynchus Karling, 1956
- Genus Antiboreorhynchus Karling, 1952
- Genus Arrawarria Willems, Schockaert & Artois, 2006
- Genus Austrorhynchus Karling, 1952
- Genus Bermudorhynchus Karling, 1978
- Genus Brachyrhynchoides Artois & Schockaert, 2013
- Genus Brachyrhynchus Artois & Schockaert, 2013 accepted as Brachyrhynchoides Artois & Schockaert, 2013
- Genus Brunetorhynchus Schockaert, Martens, Revis, Janssen, Willems & Artois, 2014
- Genus Cincturorhynchus Evdonin, 1970
- Genus Danorhynchus Karling, 1955
- Genus Distigma Diesing, 1850 accepted as Turbella Ehrenberg, 1831
- Genus Djeziraia Schockaert, 1971
- Genus Duplacrorhynchus Schockaert & Karling, 1970
- Genus Duplexostylus Willems, Schockaert & Artois, 2006
- Genus Fungorhynchus Karling, 1952
- Genus Galapagorhynchus Artois & Schockaert, 1999
- Genus Gallorhynchus Schockaert & Brunet, 1971
- Genus Gemelliclinus Evdonin, 1970
- Genus Girator Pereyaslawzew, 1892 accepted as Gyratrix Ehrenberg, 1831
- Genus Gyrator Ehrenberg, 1831
- Genus Gyratoris Diesing, 1862 accepted as Gyratrix Ehrenberg, 1831
- Genus Gyratricella Karling, 1955
- Genus Gyratrix Ehrenberg, 1831
- Genus Hawadlia Schockaert, 1971
- Genus Klattia Kepner, Stirewalt & Ferguson, 1939 accepted as Opisthocystis Sekera, 1911
- Genus Koinocystella Karling, 1952
- Genus Lagenopolycystis Artois & Schockaert, 2000
- Genus Lagenorhynchus Brunet, 1965 accepted as Lagenopolycystis Artois & Schockaert, 2000
- Genus Leucon Uljanin, 1870
- Genus Leuconoplana Leuckart, 1871
- Genus Limipolycystis Schilke, 1970
- Genus Ludmila Uljanin, 1870
- Genus Ludmilla Uljanin, 1870
- Genus Macrorhynchus Graff, 1882
- Genus Marcusia Artois & Schockaert, 1998
- Genus Megaloascos Evdonin, 1970
- Genus Myobulla Artois & Schockaert, 2000
- Genus Neopolycystis Karling, 1955
- Genus Opisthocystis Sekera, 1911
- Genus Opistocystis
- Genus Palladia Evdonin, 1977
- Genus Papia Karling, 1956
- Genus Parachrorhynchus Karling, 1956
- Genus Paracrorhynchus
- Genus Paraustrorhynchus Karling & Schockaert, 1977
- Genus Paulodora Marcus, 1948
- Genus Phonorhynchella Karling, 1956
- Genus Phonorhynchoides Beklemischev, 1927
- Genus Phonorhynchopsis Willems & Artois in Willems et al., 2017
- Genus Phonorhynchus Graff, 1905
- Genus Polycydora Diez, Sanjuan, Reygel & Artois, 2018
- Genus Polycystidarum
- Genus Polycystis Kölliker, 1845
- Species Polycystis ali Schockaert, 1982
- Species Polycystis angarensis Sibiriakova, 1929 accepted as Opisthocystis angarensis (Sibiriakowa, 1929)
- Species Polycystis assimilis (Levinsen, 1879) accepted as Porrocystis assimilis (Levinsen, 1879)
- Species Polycystis australis Willems, Schockaert & Artois, 2006
- Species Polycystis bicurvatus Nasonov, 1935
- Species Polycystis bilobata Nasonov, 1935
- Species Polycystis caledonica Meixner, 1924 accepted as Acrorhynchides caledonicus (Claperede, 1861)
- Species Polycystis caledonicus (Meixner, 1924) accepted as Acrorhynchides caledonicus (Claperede, 1861)
- Species Polycystis californica Artois & Tessens, 2008
- Species Polycystis campanulata Nasonov, 1935 accepted as Opisthocystis campanulata (Nasonov, 1935)
- Species Polycystis contorta Schockaert & Karling, 1975 accepted as Paulodora contorta (Schockaert & Karling, 1975)
- Species Polycystis crocea (Fabricius, 1826)
- Species Polycystis croceum Oersted, 1844 accepted as Macrorhynchus croceus (Fabricius, 1826)
- Species Polycystis dolichocephala Pereyaslawzewa, 1892 accepted as Paulodora dolichocephala (Pereyaslawzewa, 1892)
- Species Polycystis elsae Artois & Tessens, 2008
- Species Polycystis felis Marcus, 1954 accepted as Paulodora felis (Marcus, 1954)
- Species Polycystis gabriellae (Marcus, 1948)
- Species Polycystis georgii Graff, 1905
- Species Polycystis goettei Bresslau, 1906 accepted as Opisthocystis goettei (Bresslau, 1906)
- Species Polycystis groenlandica Levinsen, 1879
- Species Polycystis hamata Karling, 1986
- Species Polycystis hibernica Southern, 1936 accepted as Rogneda hibernica (Southern, 1936)
- Species Polycystis immundus (Schmidt, 1857) v. Graff, 1905
- Species Polycystis intubata Graff, 1905
- Species Polycystis irregularis Nasonov, 1935
- Species Polycystis irregulatus Nasonov, 1935
- Species Polycystis leucophraeus (Fabricius, 1823)
- Species Polycystis mamertina Graff, 1905 accepted as Progyrator mamertinus (Graff, 1874)
- Species Polycystis mamertinus (Graff, 1874) accepted as Progyrator mamertinus (Graff, 1874)
- Species Polycystis matarazzoi (Marcus, 1948) accepted as Paulodora matarazzoi Marcus, 1948
- Species Polycystis minuta (Uljanin, 1870) accepted as Rogneda minuta Uljanin, 1870
- Species Polycystis multifida Nasonov, 1935 accepted as Opisthocystis multifida (Nasonov, 1935)
- Species Polycystis naegelii Kölliker, 1845
- Species Polycystis naegellii Kölliker, 1845
- Species Polycystis orientalis Evdonin, 1968
- Species Polycystis papillatus (Mereschkowsky, 1878)
- Species Polycystis reticulatus Micoletzki, 1910 accepted as Progyrator mamertinus (Graff, 1874)
- Species Polycystis riedli Karling, 1956 accepted as Paulodora riedli (Karling, 1956)
- Species Polycystis robusta Meixner, 1938 accepted as Acrorhynchides robustus (Karling, 1931)
- Species Polycystis roosevelti Graff, 1911 accepted as Opisthocystis goettei (Bresslau, 1906)
- Species Polycystis steueri Steinböck, 1933 accepted as Rogneda steueri (Steinböck, 1933)
- Species Polycystis subcontorta Schockaert, 1982 accepted as Paulodora subcontorta (Schockaert, 1982)
- Species Polycystis taeniophoris Steinböck, 1933 accepted as Koinocystis taeniophoris Steinböck, 1933
- Species Polycystis tenuis Beklemischev, 1927
- Species Polycystis trifida Nasonov, 1935 accepted as Opisthocystis trifida (Nasonov, 1935)
- Species Polycystis tripalmata Beklemischev, 1927 accepted as
- Species Polycystis yagana Marcus, 1954 accepted as Marcusia yagana (Marcus, 1954)
- Genus Porrocystis Reisinger, 1926
- Genus Progyrator Sekera, 1901
- Genus Psammopolycystis Meixner, 1938
- Genus Pseudopolycystis Meixner, 1938 accepted as Acrorhynchus Graff, 1882
- Genus Pseudorogneda Wang & Xie in Xie et al., 2020
- Genus Pygmorhynchus Artois & Schockaert, 1999
- Genus Rogneda Uljanin, 1870
- Genus Rostracilla Rundell & Leander, 2014
- Genus Sabulirhynchus Artois & Schockaert, 2000
- Genus Scanorhynchus Karling, 1955
- Genus Stradorhynchus Willems, Schockaert & Artois, 2006
- Genus Syltorhynchus Noldt, 1989
- Genus Thinodactylaina Rundell & Leander, 2014
- Genus Torkarlingia Mack-Fira, 1971 accepted as Djeziraia Schockaert, 1971
- Genus Triaustrorhynchus Willems, Schockaert & Artois, 2006
- Genus Tringorhynchus Karling
- Genus Turbella Ehrenberg, 1831
- Genus Typhlopolycystis Karling, 1956
- Genus Yaquinaia Schockaert & Karling, 1970
- Genus Zuccaria Marcus, 1948
- Family Rhabdocoela incertae sedis
- Family Rhynchokarlingiidae Timoshkin, 2004
- Order Tricladida
- Order Turbellaria (awaiting allocation)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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