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
- Class Aplacophora
- Class Bivalvia
- Class Calyptoptomatida †
- Class Camerothecida
- Class Cephalopoda
- Class Cricoconarida †
- Class Gastropoda
- Class Helcionelloida †
- Class Mollusca (awaiting allocation)
- Class Mollusca incertae sedis
- Class Monoplacophora
- Class Paragastropoda †
- Class Polyplacophora
- Order Acanthochitonida
- Order Chelodida †
- Order Chitonida
- Order Hemithecellitina † accepted as Chelodida †
- Order Ischnochitonida
- Family Acanthopleuridae Dall, 1889 accepted as Chitonidae Rafinesque, 1815
- Family Callistoplacidae Pilsbry, 1893
- Family Callochitonidae Plate, 1901
- Family Chaetopleuridae Plate, 1899
- Family Chitonidae Rafinesque, 1815
- Family Gryphochitonidae †
- Family Ischnochitonidae Dall, 1889
- Genus Acutiplax Cotton & Weeding, 1939
- Genus Albrechtia Taki, 1955
- Genus Allerychiton Dell'Angelo & Oliverio, 1997
- Genus Anisoradsia Iredale & May, 1916 accepted as Ischnochiton Gray, 1847
- Genus Autochiton Iredale & Hull, 1924 accepted as Ischnochiton Gray, 1847
- Genus Basiliochiton Berry, 1918
- Genus Bathychiton Dell'Angelo & Palazzi, 1988
- Genus Callistelesma
- Genus Callistoplax Dall, 1878
- Genus Ceratophorus Dall, 1882 accepted as Ceratozona Dall, 1882
- Genus Ceratophorus Dall, 1882, nom. nud. accepted as Ceratozona Dall, 1882
- Genus Chaetopluera Pilsbry, 1893 accepted as Chaetopleura Shuttleworth, 1853
- Genus Chartoplax Iredale & Hull, 1924 accepted as Ischnochiton Gray, 1847
- Genus Chetopleura Ashby, 1929 accepted as Chaetopleura Shuttleworth, 1853
- Genus Choetopleura Shuttleworth, 1856 accepted as Chaetopleura Shuttleworth, 1853
- Genus Chondropleura Thiele, 1906 accepted as Ischnochiton Gray, 1847
- Genus Chondropleuratypus Bergenhayn, 1930 accepted as Chondropleura Thiele, 1906
- Genus Collochiton Sars, 1878 accepted as Callochiton Gray, 1847
- Genus Connexochiton Kaas, 1979
- Species Connexochiton bromleyi (Ferreira, 1985)
- Species Connexochiton discernibilis Kaas, 1991
- Species Connexochiton kaasi Saito, 1997
- Species Connexochiton moreirai (Righi, 1973)
- Species Connexochiton platynomenus Kaas, 1979
- Genus Diktuonus Ashby, 1931
- Genus Euporoplax Iredale & Hull, 1924
- Genus Euretoplax Iredale & Hull, 1924
- Genus Gurjanovillia Yakovleva, 1952 accepted as Tripoplax Berry, 1919
- Genus Hanleya H. Adams & Angas, 1864
- Genus Haplopax Tate & May, 1901
- Genus Haploplax Pilsbry, 1894 accepted as Ischnochiton Gray, 1847
- Genus Hapoplax Sykes, 1894
- Genus Heterozona Carpenter in Dall, 1879 accepted as Ischnochiton Gray, 1847
- Genus Ichnochiton Clessin, 1903 accepted as Ischnochiton Gray, 1847
- Genus Ichsnochiton Fischer, 1885 accepted as Ischnochiton Gray, 1847
- Genus Ichsnoradsia Fischer, 1885
- Genus Ischnochiton Gray, 1847
- Genus Ischnochitontypus Bergenhayn, 1930 accepted as Ischnochiton Gray, 1847
- Genus Ischnoradsia Shuttleworth, 1853 accepted as Ischnochiton Gray, 1847
- Genus Ishnochiton
- Genus Isnoradsia Dall, 1871
- Genus Isochiton Ashby & Cotton, 1934
- Genus Leloupia P. Pelseneer, 1903
- Genus Lepidopleuroides Thiele, 1928 accepted as Ischnochiton Gray, 1847
- Genus Lepidoradsia Dall, 1879
- Genus Lepidozona Pilsbry in Tryon & Pilsbry, 1892
- Genus Lepidozonatypus Bergenhayn, 1930 accepted as Lepidozona Pilsbry in Tryon & Pilsbry, 1892
- Genus Leptopleura Thiele in Troschel, 1893
- Genus Levicoplax Iredale & Hull, 1925
- Genus Lophochiton Ashby, 1923
- Genus Lophyriscus Thiele in Troschel, 1893
- Genus Lophyrochiton Yakovleva, 1952 accepted as Ischnochiton Gray, 1847
- Genus Lophyropsis Thiele in Troschel, 1893 accepted as Ischnochiton Gray, 1847
- Genus Lophyrus G.O. Sars, 1878 accepted as Ischnochiton Gray, 1847
- Genus Maugerella Dall, 1879
- Genus Nutallina Pallary, 1900 accepted as Nuttallina Carpenter MS, Dall, 1871
- Genus Nuttalina Fischer, 1885 accepted as Nuttallina Carpenter MS, Dall, 1871
- Genus Paricoplax Iredale & Hull, 1929 accepted as Callochiton Gray, 1847
- Genus Radsiella Pilsbry in Tryon & Pilsbry, 1892
- Genus Rhodoplax Thiele in Troschel, 1893
- Genus Scrobicoplax Iredale & Hull, 1929
- Genus Simplischnochiton Van Belle, 1974 †
- Genus Solivaga Iredale & Hull, 1925
- Genus Soliviga Ashby, 1929
- Genus Stenochiton H. Adams & Angas, 1864
- Genus Stenoplax Dall, 1879
- Genus Stenoradsia Carpenter MS, Dall, 1879 accepted as Stenoplax Dall, 1879
- Genus Stenosemus Middendorff, 1847
- Genus Sterochiton Pilsbry, 1893
- Genus Stretochiton Pilsbry in Tryon & Pilsbry, 1893
- Genus Strigichiton Hull, 1923
- Genus Subterenochiton Iredale & Hull, 1924
- Genus Subterenochitontypus Bergenhayn, 1930 accepted as Subterenochiton Iredale & Hull, 1924
- Genus Thermochiton Saito & Okutani, 1990
- Genus Toniciella Thiele, 1893 accepted as Tonicella Carpenter, 1873
- Genus Tonicina Thiele, 1906
- Genus Trachyradsia Dall, 1878
- Genus Tripoplax Berry, 1919
- Genus Variolepis Plate, 1899
- Genus Zostericola Ashby, 1919
- Family Loricidae Iredale & Hull, 1923
- Family Ochmazochitonidae †
- Family Schizochitonidae Dall, 1889
- Family Schizoplacidae Bergenhayn, 1955
- Family Subterenochitonidae
- Family Tonicellidae Simroth, 1894
- Order Lepidopleurida
- Order Multiplacophora †
- Order Neoloricata (awaiting allocation)
- Order Neoloricata (awaiting allocation)
- Order Paleoloricata (awaiting allocation) †
- Order Phosphatoloricatida †
- Order Polyplacophora (awaiting allocation)
- Order Septemchitonida †
- Family Dycheiidae Pojeta, Vendrasco & Darrough, 2010 †
- Class Rostroconchia †
- Class Scaphopoda
- Class Stenothecoida †
- Class Tentaculita †
- Family Maikhanellidae Missarzhevsky, 1989 †
- Genus Lingulocaris Salter, 1866 †
- Genus Modiolocaris Peach in Jehu & Campbell, 1917 † accepted as Lingulocaris Salter, 1866 †
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- 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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