Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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
- Family Amyellidae Faubel, 1984
- Family Anocellidae Quiroga, Bolanos & Litvaitis, 2006
- Family Anonymidae Lang, 1884
- Family Apidioplanidae Bock, 1926
- Family Boniniidae Bock, 1923
- Family Callioplanidae Hyman, 1953
- Family Candimboididae Faubel, 1983
- Family Cestoplanidae Lang, 1884
- Family Chromoplanidae Bock, 1922
- Family Cryptocelidae Laidlaw, 1903
- Family Cryptocelididae Laidlaw, 1903
- Family Dicteroidae Faubel, 1984
- Family Didangiidae Faubel, 1983
- Family Diphosthiidae
- Family Diplopharyngeatidae
- Family Diplosoleniidae Bock, 1913
- Family Diposthidae Woodworth, 1898
- Family Discocelidae Laidlaw, 1903 accepted as Discocelididae Laidlaw, 1903
- Family Discocelididae Laidlaw, 1903
- Family Discoprosthididae Faubel, 1983
- Family Ditremageniidae Palombi, 1928
- Family Emprosthoparnygidae accepted as Emprosthopharyngidae
- Family Emprosthopharyngidae
- Family Enantiidae Graff, 1889
- Family Euplanidae Marcus & Marcus, 1966
- Family Euryleptidae Lang, 1884
- Family Euryleptididae Faubel, 1984
- Family Faubelidae Özdikmen, 2010
- Family Gnesiocerotidae Marcus & Marcus, 1966
- Family Hoploplanidae
- Family Ilyplanidae Faubel, 1983
- Family Laidlawiidae Herzig, 1905
- Family Latocestidae Laidlaw, 1903
- Family Leptoplanidae Stimpson, 1857
- Family Limnostylochidae Faubel, 1983
- Family Mucroplanidae Faubel, 1983
- Family Notocirridae Faubel, 1983 accepted as Faubelidae Özdikmen, 2010
- Family Notoplanidae Marcus & Marcus, 1966
- Family Opisthogeniidae Palombi, 1928
- Family Palauidae Faubel, 1983
- Family Pericelidae Laidlaw, 1902
- Family Pericelididae Laidlaw, 1902 accepted as Pericelidae Laidlaw, 1902
- Family Phaenocelidae
- Family Planoceridae Lang, 1884
- Family Plehniidae Bock, 1913
- Family Pleioplanidae Faubel, 1983
- Family Polycladida (awaiting allocation)
- Family Polycladida incertae sedis
- Family Polyposthiidae Bergendal, 1893
- Family Prosthiostomidae Lang, 1884
- Family Pseudoceridae
- Family Pseudoceritidae
- Family Pseudocerotidae Lang, 1884
- Family Pseudostylochidae Faubel, 1983
- Family Stylochidae Stimpson, 1857
- Family Stylochocestidae Bock, 1913
- Family Stylochoididae Bock, 1913
- Family Stylochoplanidae Faubel, 1983
- Family Taenioplanidae
- Family Theamatidae Marcus, 1949
- Genus Eutheama Faubel, 1983 accepted as Theama Marcus, 1949
- Genus Theama Marcus, 1949
- Species Theama evelinae Marcus, 1949
- Species Theama occidua Sopott-Ehlers & Schmidt, 1975 accepted as Eutheama occidua Sopott-Ehlers & Schmidt, 1975
- Family Theamidae
- 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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