Between brackets is the number of accepted species
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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
- Order Tricladida
- Family Amphibioplanidae Stocchino, Sluys, Dols-Serrate & Riutort in Stocchino et al., 2021
- Family Bdellouridae Diesing, 1862
- Family Bipaliidae Stimpson, 1857
- Family Cotyloplanidae Von Graff, 1896 accepted as Geoplanidae Stimpson, 1857
- Family Dendrocoelidae Hallez, 1892
- Family Dimarcusidae Mitchell & Kawakatsu, 1972
- Family Diplostomidae Poirier, 1886
- Family Dugesiidae Ball, 1974
- Family Geoplanidae Stimpson, 1857
- Family Haplosplanchidae
- Family Kenkiidae Hyman, 1937
- Family Meixnerididae Westblad, 1952
- Family Nexilidae Holleman & Hand, 1962
- Family Paramphistomidae Fischoeder, 1901
- Family Planariidae Stimpson, 1857
- Genus Albioplanaria Kawakatsu, 1966 accepted as Phagocata Leidy, 1847
- Genus Albiplanaria Komarek, 1926 accepted as Phagocata Leidy, 1847
- Genus Atioplanaria Kenk, 1936 accepted as Atrioplanaria de Beauchamp, 1932
- Genus Atrioplanaria de Beauchamp, 1932
- Genus Bdellasimilis Richardson, 1968
- Genus Crenobia Kenk, 1930
- Genus Digonoporus An der Lan, 1941
- Genus Fondicola Buchanan, 1936 accepted as Fonticola Komárek, 1926
- Genus Fonticola Komárek, 1926 accepted as Phagocata Leidy, 1847
- Species Fonticola albissima (Vejdovsky, 1883)
- Species Fonticola altaica Livanov & Zabusova, 1940
- Species Fonticola armeniaca (Komarek, 1916) accepted as Phagocata armeniaca (Komarek, 1916)
- Species Fonticola bosniaca (Stankovic, 1926)
- Species Fonticola bursaperforata (Darlington, 1959)
- Species Fonticola cavernicola (Hyman, 1954)
- Species Fonticola dalmatica Stankovic & Komarek, 1927
- Species Fonticola gracilis (Haldeman, 1840) accepted as Phagocata gracilis (Haldeman, 1840)
- Species Fonticola illyrica (Komarek, 1919)
- Species Fonticola leptophallus Reisinger, 1963
- Species Fonticola macedonica (Stankovic, 1926)
- Species Fonticola maculata Stankovic, 1938
- Species Fonticola morgani (Stevens & Boring, 1906)
- Species Fonticola nivea (Kenk, 1953)
- Species Fonticola notadena (de Beauchamp, 1937)
- Species Fonticola ochridana Stankovic &Komarek, 1927
- Species Fonticola olivacea (Schmidt, 1861)
- Species Fonticola opisthogona Kenk, 1936
- Species Fonticola oregonensis (Hyman, 1963)
- Species Fonticola papillifera (Ijima & Kaburaki, 1916)
- Species Fonticola paravitta (Reisinger, 1923)
- Species Fonticola paravittoides Livanov & Zabusova, 1940
- Species Fonticola pellucida (Ijima & Kaburaki, 1916)
- Species Fonticola percaeca (Packard, 1879) accepted as Sphalloplana percoeca (Packard, 1879)
- Species Fonticola percoecum (Packard, 1879) accepted as Sphalloplana percoeca (Packard, 1879)
- Species Fonticola prosorchis (Kenk, 1937)
- Species Fonticola racovitzai (de Beauchamp, 1928)
- Species Fonticola sibirica (Sabussow, 1903)
- Species Fonticola stankovici Reisinger, 1960
- Species Fonticola subterranea (Hyman, 1937)
- Species Fonticola truncata (Leidy, 1851)
- Species Fonticola undulata Stankovic, 1960
- Species Fonticola velata (Stringer, 1909) accepted as Phagocata velata (Stringer, 1909)
- Species Fonticola vernalis (Kenk, 1944)
- Species Fonticola vitta (Duges, 1830)
- Species Fonticola vivida (Ijima & Kaburaki, 1916) accepted as Phagocata vivida (Ijima & Kaburaki, 1916)
- Genus Galeocephala Stimpson, 1857
- Genus Hymanella Castle, 1941
- Genus Iijima Bergendal, 1890
- Genus Iijimia Bergendal, 1892
- Genus Ijima Bergendal, 1890
- Genus Ijimia Bergendal, 1890
- Genus Paraplanaria Ball & Gourbault, 1978
- Genus Penecurva Livanov & Zabusova, 1940 accepted as Phagocata Leidy, 1847
- Genus Phagocata Leidy, 1847
- Genus Plagnolia Beauchamp & Gourbault, 1964 †
- Genus Planaria O.F. Müller, 1776
- Genus Podoplana Korotneff, 1912 accepted as Bdellocephala de Man, 1875
- Genus Polycelidia Livanov & Zabusova, 1940 accepted as Polycelis Ehrenberg, 1831
- Genus Polycelis Ehrenberg, 1831
- Genus Polycoelis Beneden, 1861 accepted as Polycelis Ehrenberg, 1831
- Genus Polyscelis Girard, 1850 accepted as Polycelis Ehrenberg, 1831
- Genus Seidlia Zabusov, 1911
- Genus Sorocelides Zabusova, 1929 accepted as Polycelis Ehrenberg, 1831
- Genus Spalloplana accepted as Sphalloplana de Beauchamp, 1931
- Family Procerodidae Diesing, 1862
- Family Rhynchodemidae Graff, 1896
- Family Uteriporidae Wilhelmi, 1909
- Genus Hausera Leal-Zanchet & Souza in Leal-Zanchet, Souza & Ferreira, 2014
- Genus Micropharynx Jaegerskiold, 1896
- Genus Terricolichnus Alessandrello, Pinna & Teruzzi, 1988 †
- Genus Tiddles Marcus, 1963
- 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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