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
- Family Acholadidae Hickman & Olsen, 1955
- Family Aculeorhynchidae Schilke, 1969
- Family Bertiliellidae Rieger & Sterrer, 1975
- Family Byrsophlebidae Graff, 1905
- Family Carcharodopharyngidae Bresslau, 1928-33
- Family Cicerinidae Meixner, 1928
- Family Ciliopharyngiellidae Ax, 1952
- Family Crassicolidae
- Family Cystiplanidae Karling, 1964
- Family Cytocystidae Karling, 1964 accepted as Cytocystididae Karling, 1964
- Family Cytocystididae Karling, 1964
- Family Dalyellidae accepted as Dalyelliidae Graff, 1905
- Family Dalyelliidae Graff, 1905
- Genus Alexlutheria Karling, 1956
- Genus Austrodalyellia Hochberg & Cannon, 2002
- Genus Axia Luther, 1955 accepted as Axiola Luther, 1955
- Genus Axiola Luther, 1955
- Genus Beauchampiella Luther, 1955 accepted as Beauchampiola Luther, 1957
- Genus Beauchampiola Luther, 1957
- Genus Castrella Fuhrmann, 1900
- Genus Castrella Luther, 1955 accepted as Castrella Fuhrmann, 1900
- Genus Chonestomum Schmarda, 1859 accepted as Chonostomum Schmarda, 1859
- Genus Chonostoma Graff, 1882 accepted as Chonostomum Schmarda, 1859
- Genus Chonostomum Schmarda, 1859
- Genus Dalyellia Fleming, 1822 accepted as Dalyellia Gieysztor, 1938
- Genus Dalyellia Gieysztor, 1938
- Genus Dalyellioidarum Steinbock, 1948
- Genus Debeauchampiola
- Genus Fulinskiella Gieysztor & Szynal, 1939
- Genus Gieysztoria Ruebush & Hayes, 1939
- Genus Haplodidymos Hochberg & Cannon, 2002
- Genus Hypostomum Schmidt, 1848 accepted as Dalyellia Gieysztor, 1938
- Genus Marcusiella Luther, 1955
- Genus Mesovortex An der Lan, 1939 accepted as Dalyellioidarum Steinbock, 1948
- Genus Microdalyella
- Genus Microdalyellia Gieysztor, 1938
- Species Microdalyellia abursalis (Ruebush, 1937)
- Species Microdalyellia acariaia Marcus, 1946 accepted as Gieysztoria acariaia (Marcus, 1946)
- Species Microdalyellia arctica (Nasonov, 1923)
- Species Microdalyellia armigera (Schmidt, 1862)
- Species Microdalyellia armygera Valkanov, 1934 accepted as Microdalyellia armigera (Schmidt, 1862)
- Species Microdalyellia arndti Mead & Kolasa, 1984
- Species Microdalyellia articulata (Graff, 1911) accepted as Microdalyellia rheesi (Graff, 1911)
- Species Microdalyellia aspinosa (Szynal, 1932)
- Species Microdalyellia bellis Marcus, 1946 accepted as Gieysztoria bellis (Marcus, 1946)
- Species Microdalyellia beltrami (Gieysztor, 1931) accepted as Gieysztoria beltrami (Gieysztor, 1931)
- Species Microdalyellia benacensis (Steinböck, 1932) accepted as Microdalyellia brevimana (Beklemischev, 1921)
- Species Microdalyellia bergi (Beklemischev, 1927) accepted as Gieysztoria bergi (Beklemischev, 1927)
- Species Microdalyellia bicornis (Nasonov, 1926)
- Species Microdalyellia bicoronaria (Fulinski, 1933) accepted as Gieysztoria bicoronaria (Fulinski & Szynal, 1933)
- Species Microdalyellia bipennata Norena, Campo & Real, 1999
- Species Microdalyellia biwae (Okugawa, 1930)
- Species Microdalyellia blodgetti (Silliman, 1884) accepted as Gieysztoria pseudoblodgetti Luther, 1955
- Species Microdalyellia brevimana (Beklemischev, 1921)
- Species Microdalyellia brevispina (Hofsten N, 1911)
- Species Microdalyellia brevistyla (Eggers, 1925) accepted as Microdalyellia picta (Schmidt, 1848)
- Species Microdalyellia chlynovica (Nasonov, 1919) accepted as Gieysztoria chlynovica (Nasonov, 1919)
- Species Microdalyellia circulobursalis (Ruebush, 1937)
- Species Microdalyellia complicata Ruebush & Hayes, 1939 accepted as Gieysztoria complicata (Fuhrmann, 1914)
- Species Microdalyellia cuspidata (Schmidt, 1861) accepted as Gieysztoria cuspidata (Schmidt, 1861)
- Species Microdalyellia cypris Marcus, 1946 accepted as Gieysztoria cypris (Marcus, 1946)
- Species Microdalyellia dastychi Kolasa, 1981
- Species Microdalyellia deses (Riedel, 1932)
- Species Microdalyellia diadema Ruebush & Hayes, 1939 accepted as Gieysztoria diadema (Hofsten N, 1907)
- Species Microdalyellia dissimilis (Szynal, 1932)
- Species Microdalyellia dodgei (Graff, 1911) accepted as Gieysztoria dodgei (Graff, 1911)
- Species Microdalyellia dubitativa (Sibiriakova, 1929)
- Species Microdalyellia eastmani (Graff, 1911) accepted as Halammovortex eastmani (Graff, 1911)
- Species Microdalyellia erythrocephala (Steinböck, 1949)
- Species Microdalyellia euchroa (Gieysztor, 1926) accepted as Gieysztoria euchroa (Gieysztor, 1926)
- Species Microdalyellia evelinae Marcus, 1946 accepted as Gieysztoria evelinae (Marcus, 1946)
- Species Microdalyellia expedita (Hofsten N, 1907) accepted as Gieysztoria expedita (Hofsten N, 1907)
- Species Microdalyellia fairchildi (Graff, 1911)
- Species Microdalyellia fibrosa (Szynal, 1932)
- Species Microdalyellia foreli (Hofsten N, 1911) accepted as Gieysztoria foreli (Hofsten N, 1911)
- Species Microdalyellia fulcrifera (Weise, 1942)
- Species Microdalyellia fusca (Fuhrmann, 1894)
- Species Microdalyellia gilesi Jones & Hayes, 1941
- Species Microdalyellia graffi (Hallez, 1878) accepted as Gieysztoria expedita (Hofsten N, 1907)
- Species Microdalyellia groenlandica (Riedel, 1932)
- Species Microdalyellia henophora (Weise, 1942)
- Species Microdalyellia hymanae Marcus, 1946 accepted as Gieysztoria hymanae (Marcus, 1946)
- Species Microdalyellia incerta (Bohmig, 1902)
- Species Microdalyellia inflata (Okugawa, 1930) accepted as Gieysztoria inflata (Okugawa, 1930)
- Species Microdalyellia infundibuliformis (Fuhrmann, 1894) accepted as Gieysztoria infundibuliformis (Fuhrmann, 1894)
- Species Microdalyellia intricata Marcus, 1946 accepted as Gieysztoria intricata (Marcus, 1946)
- Species Microdalyellia japonica (Okugawa, 1930) accepted as Gieysztoria japonica (Okugawa, 1930)
- Species Microdalyellia kenyae Young, 1977
- Species Microdalyellia kessleri (Plotnikow, 1906) accepted as Gieysztoria cuspidata (Schmidt, 1861)
- Species Microdalyellia kharkowiensis (Markow, 1904)
- Species Microdalyellia knipovici Beklemischev, 1953 accepted as Gieysztoria knipovici (Beklemischev, 1953)
- Species Microdalyellia koiwi (Eggers, 1925) accepted as Gieysztoria koiwi (Eggers, 1925)
- Species Microdalyellia kupelwieseri (Meixner, 1915)
- Species Microdalyellia lugubris (Reisinger, 1924) accepted as Gieysztoria lugubris (Reisinger, 1924)
- Species Microdalyellia lutheri (Nasonov, 1917) accepted as Castrella lutheri (Nasonov, 1917)
- Species Microdalyellia macrobursalis Van Der Land, 1965
- Species Microdalyellia maialis Kolasa, 1979
- Species Microdalyellia microphthalma (Vejdovsky, 1895)
- Species Microdalyellia minima (An der Lan, 1939)
- Species Microdalyellia minima (Riedel, 1932) accepted as Gieysztoria minima (Riedel, 1932)
- Species Microdalyellia mohicana (Graff, 1911)
- Species Microdalyellia mollosovi (Nasonov, 1920)
- Species Microdalyellia multiovata Luther, 1955
- Species Microdalyellia muyuensis Wang & Wu, 2005
- Species Microdalyellia nanella (Beklemischev, 1921)
- Species Microdalyellia nassonovi Beklemischev, 1950 accepted as Gieysztoria beklemischevi Luther, 1955
- Species Microdalyellia ohlsoni Luther, 1955
- Species Microdalyellia okugawai Ruebush & Hayes, 1939 accepted as Gieysztoria okugawai (Ruebush & Hayes, 1939)
- Species Microdalyellia ornata (Hofsten N, 1909) accepted as Gieysztoria ornata (Hofsten N, 1907)
- Species Microdalyellia oryzae (Nasonov, 1929) accepted as Gieysztoria oryzae (Nasonov, 1929)
- Species Microdalyellia paucispinosa (Sekera, 1888)
- Species Microdalyellia pavimentata (Beklemischev, 1919) accepted as Gieysztoria pavimentata (Beklemischev, 1919)
- Species Microdalyellia picta (Schmidt, 1848)
- Species Microdalyellia pugiofera (Weise, 1942)
- Species Microdalyellia quadridens (Bohmig, 1898) accepted as Gieysztoria quadridens (Bohmig, 1898)
- Species Microdalyellia quadridensoides (Fuhrmann, 1914) accepted as Gieysztoria quadridensoides (Fuhrmann, 1914)
- Species Microdalyellia rastafariae (Therriault & Kolasa, 1999)
- Species Microdalyellia rheesi (Graff, 1911)
- Species Microdalyellia rochesteriana (Graff, 1911)
- Species Microdalyellia rossi (Graff, 1911)
- Species Microdalyellia rubra (Fuhrmann, 1894) accepted as Gieysztoria rubra (Fuhrmann, 1894)
- Species Microdalyellia ruebushi Luther, 1955
- Species Microdalyellia sawayai Marcus, 1946
- Species Microdalyellia schmidtii (Graff, 1882)
- Species Microdalyellia schockaerti Willems, Artois, Jocqué & Brendonck, 2007
- Species Microdalyellia semispinosa (Fulinski & Szynal, 1927) accepted as Gieysztoria semispinosa (Fulinski & Szynal, 1927)
- Species Microdalyellia shennongjiae Wang & Wu, 2005
- Species Microdalyellia shenzhensis Wang & Wu, 2005
- Species Microdalyellia sibirica (Plotnikow, 1905) accepted as Gieysztoria sibirica (Plotnikow, 1905)
- Species Microdalyellia sillimani (Graff, 1911)
- Species Microdalyellia sinensis Wang & Wu, 2005
- Species Microdalyellia taurica (Nasonov, 1923) accepted as Gieysztoria taurica (Nasonov, 1923)
- Species Microdalyellia tennesseensis (Ruebush & Hayes, 1939)
- Species Microdalyellia therapaina Marcus, 1946 accepted as Gieysztoria therapaina (Marcus, 1946)
- Species Microdalyellia thienemanni (Reisinger, 1933) accepted as Gieysztoria thienemanni (Reisinger, 1933)
- Species Microdalyellia thymara Marcus, 1946 accepted as Gieysztoria thymara (Marcus, 1946)
- Species Microdalyellia transilvana (Paradi, 1882) accepted as Gieysztoria transilvana (Paradi, 1882)
- Species Microdalyellia triangulata (Robeson, 1931) accepted as Gieysztoria triangulata (Robeson, 1931)
- Species Microdalyellia tridentata (Szynal, 1932)
- Species Microdalyellia tridesma Marcus, 1946 accepted as Gieysztoria tridesma (Marcus, 1946)
- Species Microdalyellia triquetra (Fuhrmann, 1894) accepted as Gieysztoria triquetra (Fuhrmann, 1894)
- Species Microdalyellia triseriata Beklemischev, 1950
- Species Microdalyellia trisolena Marcus, 1946 accepted as Gieysztoria trisolena (Marcus, 1946)
- Species Microdalyellia tsurugae (Nasonov, 1921)
- Species Microdalyellia uncia (Marcus, 1946) accepted as Gieysztoria uncia (Marcus, 1946)
- Species Microdalyellia variospinosa (Fulinski & Szynal, 1933)
- Species Microdalyellia vinculosa (Szynal, 1933) accepted as Microdalyellia armigera (Schmidt, 1862)
- Species Microdalyellia virginiana (Ruebush, 1937)
- Species Microdalyellia virgulifer (Plotnikow, 1906) accepted as Gieysztoria virgulifera (Plotnikow, 1906)
- Species Microdalyellia wiszniewskii Gieysztor, 1938
- Species Microdalyellia zykovi (Nasonov, 1919) accepted as Gieysztoria zykovi (Nasonov, 1919)
- Genus Microdalyellia Reubush & Hayes, 1939 accepted as Microdalyellia Gieysztor, 1938
- Genus Nasonoviella Luther, 1955 accepted as Castrella Fuhrmann, 1900
- Genus Neosergia Li, 2023
- Genus Nitschia Rathke, 1843 accepted as Nitzschia Baer, 1826
- Genus Nitychia Nordmann, 1833 † accepted as Nitzschia Baer, 1826
- Genus Nityschia Nordmann, 1833 † accepted as Nitzschia Baer, 1826
- Genus Nitzchia Gervais, 1846 † accepted as Nitzschia Baer, 1826
- Genus Polliculus Van Steeniste, Schockaert & Artois in Van Steenkiste, Volonterio, Schockaert & Artois, 2008
- Genus Pseudodalyellia Van Steenkiste, Gobert, Davison, Kolasa & Artois, 2011
- Genus Scoparia Gieysztor, 1933 accepted as Dalyellia Gieysztor, 1938
- Genus Scopariella Ruebush & Hayes, 1939 accepted as Dalyellia Gieysztor, 1938
- Genus Sergia Nasonov, 1923 accepted as Neosergia Li, 2023
- Genus Thalassovortex Papi, 1956
- Genus Vaillantiella Luther, 1955
- Genus Varsoviella Gieysztor & Wiszniewski, 1947
- Family Diascorhynchidae Meixner, 1929
- Family Diceratocephalidae Joffe, Cannon & Schockaert, 1998
- Family Didymorchidae
- Family Fecampiidae Graff, 1903
- Family Gnathorhynchidae Meixner, 1929
- Family Graffillidae Graff, 1904-08
- Family Hypoblepharinidae Bohmig, 1914
- Family Karkinorhynchidae Meixner, 1928
- Family Koinocystidae
- Family Kytorhynchidae Rieger, 1974
- Family Nematorhynchidae Schilke, 1969
- Family Notenteridae Joffe, Selivanova & Kornakova, 1997
- Family Placorhynchidae Meixner, 1938
- Family Polycystidae Meixner, 1924 accepted as Polycystididae Graff, 1905
- Family Promesostomidae Hartog, 1964
- Family Provorticidae Beklemischev, 1927
- Family Psammorhynchidae Karling, 1956
- Family Pterastericolidae Meixner, 1925
- Family Pterastricolidae
- Family Schizorhynchidae Graff, 1905
- Family Scutariellidae Annandale, 1912
- Family Solenopharyngidae Graff, 1882
- Family Temnocephalidae Monticelli, 1899
- Family Trigonostomidae Graff, 1905
- Family Typhloplanidae Graff, 1905
- Family Typhlorhynchidae
- Family Umagillidae Wahl, 1910
- Order Polycladida
- Order Prolecithophora
- Order Proplicastomata
- Order Proseriata
- Order Rhabdocoela
- 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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