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
- Subphylum Cephalochordata
- Subphylum Tunicata accepted as Urochordata
- Subphylum Urochordata
- Subphylum Vertebrata
- Superclass Tetrapoda
- Class Amphibia
- Class Aves
- Class Mammalia
- Class Mammaliaformes incertae sedis †
- Class Reptilia
- Order Aetosauria †
- Order Anapsida (awaiting allocation)
- Order Araeoscelida † represented as Araeoscelidia †
- Order Araeoscelidia †
- Order Archosauria (awaiting allocation) †
- Order Archosauria incertae sedis
- Order Archosauriformes incertae sedis †
- Order Archosauromorpha incertae sedis †
- Order Avetheropoda †
- Order Captorhinida †
- Order Chelonia accepted as Testudines
- Order Choristodera †
- Order Cotylosauria †
- Order Crocodylia
- Order Crocodyliformes incertae sedis
- Order Crocodylomorpha incertae sedis
- Order Diapsida incertae sedis †
- Order Dinosauria (awaiting allocation) †
- Order Dinosauria incertae sedis †
- Order Dinosauriformes (awaiting allocation) †
- Order Eosuchia †
- Order Eusuchia incertae sedis
- Order Herrerasauria †
- Order Huenesuchia †
- Order Hupehsuchia †
- Order Ichthyopterygia (awaiting allocation) †
- Order Ichthyosauria †
- Order Lepidosauria (awaiting allocation)
- Order Lepidosauria incertae sedis
- Order Lepidosauromorpha incertae sedis
- Order Loricata incertae sedis
- Order Mesoeucrocodylia incertae sedis
- Order Neodiapsida incertae sedis
- Order Neosuchia incertae sedis
- Order Nothosauria †
- Order Ornithischia †
- Order Parareptilia incertae sedis †
- Order Paraves incertae sedis †
- Order Pareiasauria †
- Order Pelycosauria †
- Order Placodontia †
- Order Plesiosauria †
- Order Procolophonoidea †
- Order Procolophonomorpha †
- Order Prolacertiformes †
- Order Protorosauria †
- Order Pterosauria †
- Order Pterosauromorpha incertae sedis †
- Order Rauisuchiformes †
- Order Reptilia (awaiting allocation)
- Order Reptilia incertae sedis
- Order Rhynchocephalia
- Order Rhynchosauria †
- Order Saurischia †
- Order Sauropsida (awaiting allocation) †
- Order Sauropterygia † accepted as Sauropterygia incertae sedis
- Order Sauropterygia incertae sedis
- Order Sphenodontida
- Order Squamata
- Family Acrochordidae Bonaparte, 1840
- Family Acrodonta incertae sedis
- Family Agamidae Gray, 1827
- Family Aigialosauridae Kramberger, 1892 †
- Family Amphisbaenia (awaiting allocation)
- Family Amphisbaenia incertae sedis
- Family Amphisbaenidae Gray, 1865
- Family Anguidae Gray, 1825
- Family Anguimorpha incertae sedis
- Family Aniliidae Fitzinger, 1826
- Family Anilioidea incertae sedis †
- Family Anniellidae
- Family Anomalepidae
- Family Anomalophiidae †
- Family Anomochilidae
- Family Aprasiaidae Wells, 2007 accepted as Pygopodidae Boulenger, 1884
- Family Ardeosauridae Camp, 1923 †
- Family Arretosauridae Gilmore, 1943 †
- Family Atractaspididae
- Family Bainguidae Borsuk-Bialynicka, 1984 †
- Family Barbatteiidae Codrea, Venczel & Solomon, 2017 †
- Family Bavarisauridae Kuhn, 1961 †
- Family Bipedidae
- Family Blanidae Kearney, 2003
- Family Boidae Gray, 1825
- Family Bolyeridae accepted as Bolyeriidae
- Family Bolyeriidae
- Family Booidea incertae sedis †
- Family Borioteiioidea incertae sedis †
- Family Caenophidia (awaiting allocation)
- Family Carolinidae Borsuk-Bialynicka, 1985 †
- Family Carphodactylidae Kluge, 1967
- Family Chamaeleonidae Gray, 1825
- Family Chamaeleontidae
- Family Chamopsiidae Nydam, Caldwell & Fanti, 2010 †
- Family Changjiangosauridae Hou, 1976 †
- Family Colubridae Oppel, 1811
- Family Colubroidea (awaiting allocation)
- Family Contogeniidae Nydam & Fitzpatrick, 2009 †
- Family Cordylidae Gray, 1837
- Family Corytophanidae
- Family Crotalidae
- Family Crotaphytidae
- Family Cyclocoridae Weinell & Brown, 2017
- Family Cylindrophiidae Fitzinger, 1843
- Family Dactyloidae Fitzinger, 1843
- Family Dibamidae Boulenger, 1884
- Family Dinilysiidae Romer, 1956 †
- Family Diplodactylidae Underwood, 1954
- Family Diploglossidae Boucourt, 1873
- Family Dipsadidae Bonaparte, 1840
- Family Dolichosauridae Gervais, 1852 †
- Family Dorsetisauridae Hoffstetter, 1967 †
- Family Eichstaettisauridae Kuhn, 1958 †
- Family Elapidae Boié, 1827
- Family Eolacertidae Čerňanský & Smith, 2017 †
- Family Eoxantidae Alifanov, 1993 †
- Family Erycidae Bonaparte, 1825 †
- Family Erycinidae Kuhn, 1967 accepted as Boidae Gray, 1825
- Family Euposauridae Camp, 1923 †
- Family Gekkonidae Gray, 1825
- Family Gekkoolithidae Hirsch, 1996 †
- Family Gekkota incertae sedis
- Family Gerrhosauridae
- Family Globauridae Alifanov, 2000 †
- Family Gobiguania incertae sedis †
- Family Gymnophthalmidae Fitzinger, 1826
- Family Helodermatidae Gray, 1837
- Family Hoplocercidae
- Family Hydrophidae accepted as Hydrophiidae Smith, 1926
- Family Hydrophiidae Smith, 1926
- Family Hyporhinidae Baur, 1893 †
- Family Iguania incertae sedis
- Family Iguanidae Gray, 1827
- Family Isodontosauridae Alifanov, 1993 †
- Family Kuehneosauridae Romer, 1966 †
- Family Lacertibaenia incertae sedis †
- Family Lacertidae Bonaparte, 1831
- Genus Acanthodactylus Wiegmann, 1834
- Genus Acantodactylus accepted as Acanthodactylus Wiegmann, 1834
- Genus Adolfus Sternfeld, 1912
- Genus Ageroides Gray, 1845 accepted as Algyroides Bibron & Bory in Bory de St. Vincent, 1833
- Genus Algeroides Gray, 1845 accepted as Algyroides Bibron & Bory in Bory de St. Vincent, 1833
- Genus Algira Gray, 1838
- Genus Algiroides Duméril & Bibron, 1839 accepted as Algyroides Bibron & Bory in Bory de St. Vincent, 1833
- Genus Algyra Cuvier, 1829
- Genus Algyroides Bibron & Bory in Bory de St. Vincent, 1833
- Genus Amystes Wiegmann, 1835
- Genus Anatololacerta Arnold, Arribas & Carranza, 2007
- Genus Apathya
- Genus Apeltonotus Boulenger, 1918
- Genus Aporosaura Boulenger, 1887 accepted as Meroles Gray, 1838
- Genus Archaeolacerta accepted as Lacerta Linnaeus, 1758
- Genus Aspidorhinus Eichwald, 1841
- Genus Aspistes Gistl, 1848 accepted as Psammodromus Fitzinger, 1826
- Genus Aspistis Wagler, 1830 accepted as Psammodromus Fitzinger, 1826
- Genus Atlantolacerta Arnold, Arribas & Carranza, 2007
- Genus Australolacerta Arnold, 1989
- Genus Bedriagaia Boulenger, 1916
- Genus Cabrita Gray, 1838
- Genus Callisaura Agassiz, 1846
- Genus Callosaura Gray, 1845
- Genus Calosaura Duméril & Bibron, 1839
- Genus Cernaycerta Augé, 2005 †
- Genus Chondrophiops Blanford, 1873
- Genus Congolacerta Greenbaum, Villanueva, Kusamba, Aristote & Branch, 2011
- Genus Dalmatolacerta Arnold, Arribas & Carranza, 2007
- Genus Darevskia Arribas, 1999
- Genus Dinarolacerta Arnold, Arribas & Carranza, 2007
- Genus Dormaalisaurus Augé & Smith, 2002 †
- Genus Dracaenosaurus Pomel, 1846 †
- Genus Edlartetia Augé & Rage, 2000 †
- Genus Elaphropus Fitzinger, 1843 accepted as Gallotia Boulenger, 1916
- Genus Eremias Wiegmann, 1834
- Genus Escampcerta Augé, 2005 †
- Genus Gallotia Boulenger, 1916
- Genus Gastropholis Fischer, 1886
- Genus Gracilicerta Augé, 2005 †
- Genus Gymnops Blanford, 1870
- Genus Heliobolus Fitzinger, 1843
- Genus Hellenolacerta Arnold, Arribas & Carranza, 2007
- Genus Holaspis Gray, 1863
- Genus Iberolacerta Arribas, 1999
- Genus Ichnotropis Peters, 1854
- Genus Iranolacerta Arnold, Arribas & Carranza, 2007
- Genus Laacerta accepted as Lacerta Linnaeus, 1758
- Genus Lacerta Linnaeus, 1758
- Genus Lacertus Lacepède, 1788 accepted as Lacerta Linnaeus, 1758
- Genus Latastia Bedriaga, 1884
- Genus Latastica accepted as Latastia Bedriaga, 1884
- Genus Ligerosaurus Augé, Bailon & Malfay, 2003 †
- Genus Macmahonia Boulenger, 1918
- Genus Maioricalacerta Bailon, Boistel, Bover & Alcover, 2014 †
- Genus Mediolacerta Augé, 2005 †
- Genus Meroles Gray, 1838
- Genus Mesalina Gray, 1838
- Genus Notopholis Wagler, 1830
- Genus Nucras Gray, 1845
- Genus Ohisops accepted as Ophisops Ménétriés, 1832
- Genus Omanosaura Lutz, Bischoff & Mayer, 1986
- Genus Ommateremias Lantz, 1928
- Genus Opheops Gistl, 1868 accepted as Ophisops Ménétriés, 1832
- Genus Ophiops Wiegmann, 1837 accepted as Ophisops Ménétriés, 1832
- Genus Ophisops Ménétriés, 1832
- Genus Opmanosaura accepted as Omanosaura Lutz, Bischoff & Mayer, 1986
- Genus Pachyrhynchus accepted as Meroles Gray, 1838
- Genus Pachyrhyncus Barboza du Bocage, 1867 accepted as Meroles Gray, 1838
- Genus Pareremias Shcherbak, 1973
- Genus Parvilacerta Harris, Arnold & Thomas, 1998
- Species Parvilacerta fraasii Lehrs, 1910
- Species Parvilacerta parva Boulenger, 1887
- Genus Parvilacerta Arnold, Arribas & Carranza, 2007
- Genus Pedioplanis Fitzinger, 1843
- Genus Philochortus Matschie, 1893
- Genus Phoenicolacerta Arnold, Arribas & Carranza, 2007
- Genus Platydaedalus Gistl, 1848 accepted as Psammodromus Fitzinger, 1826
- Genus Platyplacopus Boulenger, 1918
- Genus Plesiolacerta Hoffstetter, 1942
- Genus Podarces Wiegmann, 1834 accepted as Podarcis Wagler, 1830
- Genus Podarcis Wagler, 1830
- Genus Poderces accepted as Podarcis Wagler, 1830
- Genus Poromera Boulenger, 1887
- Genus Psammodromus Fitzinger, 1826
- Genus Psammuros Wagler, 1830 accepted as Psammodromus Fitzinger, 1826
- Genus Psammurus Wiegmann, 1834 accepted as Psammodromus Fitzinger, 1826
- Genus Pseuderemias Böttger, 1883
- Genus Pseudeumeces Hoffstetter, 1944 †
- Genus Pseudophiops Jerdon, 1870
- Genus Quercycerta Augé, 2005 †
- Genus Rhabderemias Lantz, 1928
- Genus Scapteira Wiegmann, 1834
- Genus Scaptira Agassiz, 1846 accepted as Scapteira Wiegmann, 1834
- Genus Scelarcis Fitzinger, 1843
- Genus Scrapteira Gray, 1845 accepted as Scapteira Wiegmann, 1834
- Genus Tachidromus Latreille, 1804 accepted as Takydromus Daudin, 1802
- Genus Tachydromus Daudin, 1802 accepted as Takydromus Daudin, 1802
- Genus Tachydromus Oppel, 1811 accepted as Takydromus Daudin, 1802
- Genus Tachysaurus Gray, 1845
- Genus Takydromus Daudin, 1802
- Genus Teira Gray, 1838
- Genus Thermophilus Fitzinger, 1843
- Genus Thimon Bonaparte, 1841 accepted as Timon Tschudi, 1836
- Genus Timon Tschudi, 1836
- Genus Tropidosaura Fitzinger, 1826
- Genus Tropidosaura Boie in Férussac, 1826 accepted as Tropidosaura Fitzinger, 1826
- Genus Vhembelacerta Edwards, Herrel, Vanhooydonck, Measey, Tolley & Branch, 2013
- Genus Zerzoumia Lataste, 1880
- Genus Zootica accepted as Zootoca Wagler, 1830
- Genus Zootoca Wagler, 1830
- Family Lacertilia (awaiting allocation)
- Family Lacertoidea incertae sedis
- Family Lamprophiidae Fitzinger, 1843
- Family Lanthanotidae Steindachner, 1878
- Family Lanthonotidae
- Family Lapparantophiidae †
- Family Lapparentopheidae Hoffstetter, 1968 †
- Family Laticaudidae
- Family Leiosauridae
- Family Leptotyphlopidae Stejneger, 1892
- Family Loxocemidae
- Family Macrocephalosauridae Sulimski, 1975 †
- Family Macrostomata incertae sedis †
- Family Madstoiidae † accepted as Madtsoiidae Hoffstetter, 1961 †
- Family Madtsoiidae Hoffstetter, 1961 †
- Family Monstersauria incertae sedis †
- Family Mosasauria incertae sedis †
- Family Mosasauridae Gervais, 1853 †
- Family Necrosauridae Hoffstetter, 1943 †
- Family Nigerophiidae Rage, 1975 †
- Family Oligodontosauridae Estes, 1975 †
- Family Ophidia incertae sedis
- Family Opluridae
- Family Pachyophiidae Nopcsa, 1923 †
- Family Palaeopheidae Lydekker, 1888 † accepted as Palaeophiidae Lydekker, 1888 †
- Family Palaeophidae † accepted as Palaeophiidae Lydekker, 1888 †
- Family Palaeophiidae Lydekker, 1888 †
- Family Palaeovaranidae Georgalis, 2017 †
- Family Paliguanidae †
- Family Paramacellodidae Estes, 1983 †
- Family Parasaniwidae Estes, 1964 †
- Family Paravaranidae Borsuk-Bialynicka, 1984 †
- Family Pareatidae Romer, 1956 accepted as Pareidae Romer, 1956
- Family Pareidae Romer, 1956
- Family Phrynosomatidae
- Family Platynota incertae sedis
- Family Pleurodonta incertae sedis
- Family Polychrotidae
- Family Polyglyphanodontia incertae sedis †
- Family Polyglyphanodontidae Gilmore, 1942 †
- Family Polyodontobaenidae Folie, Smith & Smith, 2013 †
- Family Priscagamidae Borsuk-Białynicka & Moody, 1984 †
- Family Pygopodidae Boulenger, 1884
- Family Pythonidae Fitzinger, 1826 accepted as Boidae Gray, 1825
- Family Rhineuridae Vanzolini, 1951 †
- Family Russelophiidae †
- Family Sauria (awaiting allocation)
- Family Saurosternidae Haughton, 1924 †
- Family Scincidae Gray, 1825
- Family Scincogekkonomorpha incertae sedis
- Family Scincoidea (awaiting allocation)
- Family Scincoidea incertae sedis
- Family Scincomorpha incertae sedis
- Family Scleroglossa incertae sedis
- Family Serpentes (awaiting allocation)
- Family Serpentes incertae sedis †
- Family Shinisauridae Ahl, 1930
- Family Simoliophiidae †
- Family Sphaerodactylidae Underwood, 1954
- Family Squamata (awaiting allocation)
- Family Teiidae Gray, 1827
- Family Trogonophidae Bonaparte, 1838
- Family Trogonophiidae accepted as Trogonophidae Bonaparte, 1838
- Family Tropidophiidae Cope, 1894
- Family Tropiduridae
- Family Typhlopidae Bonaparte, 1831
- Family Uropeltidae
- Family Varanidae Hardwicke & Gray, 1824
- Family Varanoidea incertae sedis
- Family Viperidae Oppel, 1811
- Family Xantusiidae Baird, 1858
- Family Xenodermidae Gray, 1849
- Family Xenopeltidae Bonaparte, 1845
- Family Xenosauridae Cope, 1866
- Genus Aiolosaurus Gao & Norell, 2000 †
- Genus Baabdasaurus Arnold, Azar, Ineich & Nel, 2002 †
- Genus Bharatagama Evans, Prasad & Manhas, 2002 †
- Genus Bothriagenys Nydam, 2002 †
- Genus Conantophis Holman & Harrison, 2000 †
- Genus Cryptovaranoides Whiteside, Chambi-Trowell & Benton, 2022 †
- Genus Ctenomastax Gao & Norell, 2000 †
- Genus Dimekodontosaurus Nydam, 2002 †
- Genus Haasiophis Tchernov, Rieppel, Zaher, Polcyn & Jacobs, 2000 †
- Genus Hongshanxi Dong, Wang, Mou, Zhang & Evans, 2019 †
- Genus Hydrargysaurus Wick & Shiller, 2020 †
- Genus Hymenosaurus Gao & Norell, 2000 †
- Genus Indrasaurus O'Connor, Zheng, Dong, Wang, Wang, Zhang & Zhou, 2019 †
- Genus Jucaraseps Bolet & Evans, 2012 †
- Genus Megachirella Renesto & Posenato, 2003 †
- Genus Messelopython Zaher & Smith, 2020 †
- Genus Moqisaurus Dong, Wang & Evans, 2022 †
- Genus Myrmecodaptria Gao & Norell, 2000 †
- Genus Paleochelco Martinelli, Agnolín & Ezcurra, 2021 †
- Genus Parasaurillus Evans & Searle, 2002 †
- Genus Primaderma Nydam, 2000 †
- Genus Sauripes Lee, Lee, Fiorillo & Lü, 2018 †
- Genus Schillerosaurus Nydam, Chure & Evans, 2013 †
- Genus Temujinia Gao & Norell, 2000 †
- Genus Zapsosaurus Gao & Norell, 2000 †
- Order Synapsida (awaiting allocation)
- Order Synaptosauria (awaiting allocation) †
- Order Testudinata incertae sedis
- Order Testudines
- Order Tetrapodamorpha incertae sedis †
- Order Thalattosauria †
- Order Thalattosuchia †
- Order Thecodontia †
- Order Therapsida †
- Order Theriodontia †
- Order Trilophosauria †
- Order Younginiformes †
- Family Gracilisuchidae Butler, Sullivan, Ezcurra, Liu, Lecuona & Sookias, 2014 †
- Genus Anshunpes Xing, Klein, Lockley, Wu, Benton, Zeng & Romilio, 2020 †
- Genus Antarcticoolithus Legendre, Rubilar-Rogers, Musser, Davis, Otero, Vargas & Clarke, 2020 †
- Genus Archaeoraptor Sloan, 1999 †
- Genus Brittagnathus Ahlberg & Clack, 2020 †
- Genus Diploradus Clack & Smithson in Clack et al., 2017 †
- Genus Mesanerpeton Smithson & Clack, 2018 †
- Genus Ossirarus Clack & Smithson in Clack et al., 2017 †
- Genus Parmastega Beznosov, Clack, Lukševičs, Ruta & Ahlberg, 2019 †
- Genus Perittodus Clack & Smithson in Clack et al., 2017 †
- Genus Sigournea Bolt & Lombard, 2006 †
- Genus Tantallognathus Chen, Alavi, Brazeau, Blom, Millward & Ahlberg, 2017 †
- Genus Tutusius Gess & Ahlberg, 2018 †
- Genus Umzantsia Gess & Ahlberg, 2018 †
- Class Acanthodii †
- Class Actinopterygii
- Class Agnatha (awaiting allocation)
- Class Cephalaspidomorphi
- Class Chondrichthyes
- Class Conodonta †
- Class Dipnoi
- Class Dipnomorpha accepted as Dipnoi
- Class Galeaspida †
- Class Gnathostomata incertae sedis †
- Class Myxini
- Class Osteichthyes (awaiting allocation)
- Class Osteichthyes incertae sedis †
- Class Ostracodermi †
- Class Pisces (awaiting allocation)
- Class Placodermi †
- Class Pteraspidomorphi †
- Class Sarcopterygii
- Class Thelodonti †
- Genus Emmonsaspis Resser & Howell, 1938 †
- Genus Harajicadectes Choo, Holland, Clement, King, Challands, Young & Long, 2024 †
- Genus Kahamachli Malkani, 2019 †
- Genus Nuucichthys Lerosey-Aubril & Ortega-Hernández, 2024 †
- Genus Rhynchocopros Hunt, Lucas & Spielmann, 2013 †
- Genus Santamariacopros Hunt, Lucas & Spielmann, 2013 †
- Genus Squirmarius McCoy, Wittry, Sadabadi & Mayer, 2023 †
- Class Chordata (awaiting allocation)
- Class Eotetrapodiformes incertae sedis
- 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
- 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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