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
- 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
- Genus Aeluronyx Fitzinger, 1843 accepted as Ailuronyx Fitzinger, 1843
- Genus Aelurosaurus Boulenger, 1885 accepted as Aeluroscalabotes Boulenger, 1885
- Genus Aeluroscalabotes Boulenger, 1885
- Genus Afroedura Loveridge, 1944
- Genus Afrogecko Bauer, Good & Branch, 1997
- Genus Agamura Blandford, 1874
- Genus Ailuronyx Fitzinger, 1843
- Genus Aliurus Dunn & Dunn, 1940 accepted as Hemidactylus Oken, 1817
- Genus Alsophylax Fitzinger, 1843
- Genus Altiphylax Yeriomtschenko & Szczerbak, 1984
- Genus Amalosia Wells & Wellington, 1983
- Genus Amamisaurus Borner, 1981 accepted as Goniurosaurus Barbour, 1908
- Genus Amydosaurus Gray, 1845
- Genus Anarbylus Murphy, 1974
- Genus Ancylodactylus Müller, 1907
- Genus Anomalurus Fitzinger, 1843 accepted as Underwoodisaurus Wermuth, 1965
- Genus Anoplopus Wagler, 1830
- Genus Archipelagekko Wood et al., 2020 accepted as Gekko Laurenti, 1768
- Genus Aristelligella Noble & Klingel, 1932
- Genus Aristelliger Cope, 1861
- Genus Asaccus Dixon & Anderson, 1973
- Genus Asacus accepted as Asaccus Dixon & Anderson, 1973
- Genus Ascalabotes Cuvier, 1817
- Genus Asiocolotes Golubev, 1984
- Genus Balawangekko Wood et al., 2020 accepted as Gekko Laurenti, 1768
- Genus Bauerius Lobon-Rovira, Conradie, Vaz Pinto, Keates, Edwards, du Plessis & Branch, 2022
- Genus Blaesodactylus Böttger, 1893
- Genus Bogertia Loveridge, 1941
- Genus Boltalia Gray, 1842
- Genus Boltalia Gray, 1840
- Genus Brachydactylus Peters, 1863
- Genus Briba Amaral, 1935
- Genus Bunocnemis Günther, 1894
- Genus Bunopus Blanford, 1874
- Genus Cadurcogekko Hoffstetter, 1946 †
- Genus Cainodactylus Barbour, 1924
- Genus Calledactylus accepted as Calodactylodes Strand, 1928
- Genus Calodactylodes Strand, 1928
- Genus Calodactylus Beddome, 1870 accepted as Calodactylodes Strand, 1928
- Genus Carinatogecko Golubev & Shcherbak, 1981
- Genus Carphodactylus Günther, 1897
- Genus Ceramodactylus Blanford, 1874
- Genus Ceratolophus Barboza de Bocage, 1873
- Genus Ceratophus accepted as Ceratolophus Barboza de Bocage, 1873
- Genus Chalinocnemis Duges, 1883 accepted as Gehyra Gray, 1834
- Genus Chameleonurus Boulenger, 1879
- Genus Chatogekko Gamble, Daza, Colli, Vitt & Bauer, 2011
- Genus Chiroperus Wiegmann, 1834
- Genus Chondrodactylus Peters, 1870
- Genus Christinis accepted as Christinus Wells & Wellington, 1983
- Genus Christinus Wells & Wellington, 1983
- Genus Cirtodactylus Bonaparte, 1831 accepted as Cyrtodactylus Gray, 1827
- Genus Cnemaspis Strauch, 1887
- Genus Coleodactylus Parker, 1926
- Genus Coleonyx Gray, 1845
- Genus Colopus Peters, 1869
- Genus Correlophus Guichenot, 1866
- Genus Cosymbotus Fitzinger, 1843
- Genus Cretaceogekko Arnold & Poinar, 2008 †
- Genus Crossobamon Böttger, 1888
- Genus Crossurus Wagler, 1830
- Genus Cryptactites Bauer, Good & Branch, 1997
- Genus Crytodactylus Kluge, 1967 accepted as Cyrtodactylus Gray, 1827
- Genus Cyrtodactylus Gray, 1827
- Genus Cyrtodactylys accepted as Cyrtodactylus Gray, 1827
- Genus Cyrtopodion Fitzinger, 1843
- Genus Cyrtopodium Agassiz, 1846 accepted as Cyrtopodion Fitzinger, 1843
- Genus Cytodactylus accepted as Cyrtodactylus Gray, 1827
- Genus Dactychilikion Thominot, 1878
- Genus Dactychylikion Thominot, 1878
- Genus Dactyloperus Fitzinger, 1843
- Genus Dinosaura Gistl, 1868 accepted as Cyrtodactylus Gray, 1827
- Genus Discodactylus Fitzinger, 1843
- Genus Dixonius Bauer, Good & Branch, 1997
- Genus Doryura Gray, 1845
- Genus Dravidogecko Smith, 1933
- Genus Ebenaria Carus, 1879 accepted as Ebenavia Böttger, 1879
- Genus Ebenavia Böttger, 1879
- Genus Elasmodactylus Boulenger, 1895
- Genus Emydactylus accepted as Hemidactylus Oken, 1817
- Genus Eublepharis Gray, 1827
- Genus Euleptes Fitzinger, 1843
- Genus Euplephoris Bonaparte, 1831 accepted as Eublepharis Gray, 1827
- Genus Garthia Vanzolini & Donoso-Barros, 1966
- Genus Garzoniella Perret, 1976
- Genus Gecco Ritgen, 1828 accepted as Gekko Laurenti, 1768
- Genus Gecko Brongniart, 1800 accepted as Gekko Laurenti, 1768
- Genus Geckoella Gray, 1867
- Genus Geckoides Péron & Lesueur, 1807
- Genus Geckolepis Grandidier, 1867
- Genus Geckonia Mocquard, 1895
- Genus Gecus Rafinesque, 1810 accepted as Gekko Laurenti, 1768
- Genus Gehira accepted as Gehyra Gray, 1834
- Genus Gehyla Okada, 1938 accepted as Gehyra Gray, 1834
- Genus Gehyra Gray, 1834
- Genus Geisopristurus Lanza & Romoli Sassi, 1968
- Genus Gekko Laurenti, 1768
- Genus Geko Rafinesque, 1815 accepted as Gekko Laurenti, 1768
- Genus Gerandogekko Hoffstetter, 1946 †
- Genus Goggia Bauer, Good & Branch, 1997
- Genus Gonatodes Fitzinger, 1843
- Genus Goniodactylus Gray, 1842
- Genus Goniodactylus Kuhl in Férussac, 1826 accepted as Gonydactylus Kuhl & Hasselt, 1822
- Genus Goniurosaurus Barbour, 1908
- Genus Gonotodes accepted as Gonatodes Fitzinger, 1843
- Genus Gonydactylus Kuhl & Hasselt, 1822
- Genus Gonyodactylus Wagler, 1830 accepted as Gonydactylus Kuhl & Hasselt, 1822
- Genus Gymnodactylus Spix, 1825
- Genus Gymnodayctylus accepted as Gymnodactylus Spix, 1825
- Genus Haemodracon Bauer, Good & Branch, 1997
- Genus Hemidact Oken, 1817 accepted as Hemidactylus Oken, 1817
- Genus Hemidactylus Oken, 1817
- Genus Hemidactylus Gray, 1825
- Genus Hemidactylus Gray, 1827
- Genus Hemidactylys accepted as Hemidactylus Oken, 1817
- Genus Hemiphyllodactylus Bleeker, 1860
- Genus Hemitheconyx Stejneger, 1893
- Genus Heteronota Gray, 1845 accepted as Heteronotia Wermuth, 1965
- Genus Heteronotia Wermuth, 1965
- Genus Heteropholis Fischer, 1882
- Genus Hetoronota accepted as Heteronotia Wermuth, 1965
- Genus Hoburogekko Alifanov, 1989 †
- Genus Holodactylus Böttger, 1893
- Genus Homodactylus Gray, 1864
- Genus Homonota Gray, 1845
- Genus Homopholis Boulenger, 1885
- Genus Homopholus accepted as Homopholis Boulenger, 1885
- Genus Hoplopodion Fitzinger, 1843
- Genus Hoplopodium Agassiz, 1846
- Genus Idiodactylus Bocourt, 1873
- Genus Japonigekko Wood et al., 2020 accepted as Gekko Laurenti, 1768
- Genus Kaokogecko Steyn & Haacke, 1966
- Genus Kolekanos Heinicke, Daza, Greenbaum, Jackman & Bauer, 2014
- Genus Lakigecko Torki, 2020
- Genus Lanthrogeko accepted as Lepidoblepharis Peracca, 1897
- Genus Laonogekko Augé, 2003 †
- Genus Lapidoblepharis accepted as Lepidoblepharis Peracca, 1897
- Genus Lathrogecko Ruthven, 1916 accepted as Lepidoblepharis Peracca, 1897
- Genus Leiurus Gray, 1845 accepted as Hemidactylus Oken, 1817
- Genus Lepidoblepharis Peracca, 1897
- Genus Lepidoblepharus accepted as Lepidoblepharis Peracca, 1897
- Genus Lepidodactylus Fitzinger, 1843
- Genus Liurus Cope in Slack, 1862 accepted as Hemidactylus Oken, 1817
- Genus Liurus "Agassiz, 1846" accepted as Liurus Cope in Slack, 1862
- Genus Lomatodactylus Van der Hoeven, 1833
- Genus Lonchurus Fitzinger, 1843 accepted as Uroplatus Duméril, 1805
- Genus Lophopholis Smith & Deraniyagala, 1934
- Genus Luperosaurus Gray, 1845
- Genus Lygodactylus Gray, 1864
- Genus Lygodacutylus accepted as Lygodactylus Gray, 1864
- Genus Lyperosaurus accepted as Luperosaurus Gray, 1845
- Genus Makariogecko Joger, 1984
- Genus Manwellisaurus Wells & Wellington, 1989
- Genus Mascarenogecko Ulber & Gericke, 1988
- Genus Matoatoa Nussbaum, Raxworthy & Pronk, 1998
- Genus Mediodactylus Shcherbak & Golubev, 1977
- Genus Mesiodactylus accepted as Mediodactylus Shcherbak & Golubev, 1977
- Genus Mesodactylus Szczerbak & Golubev, 1984
- Genus Mesodactylys accepted as Mesodactylus Szczerbak & Golubev, 1984
- Genus Microgecko Nikolski, 1907
- Genus Microscalabotes Boulenger, 1883
- Genus Millotisaurus Pasteur, 1962
- Genus Mimetozoon Boulenger, 1897
- Genus Nactus Kluge, 1983
- Genus Narudasia Methuen & Hewitt, 1913
- Genus Neotarentola Joger, 1984
- Genus Nephrurus Günther, 1876
- Genus Nephrus accepted as Nephrurus Günther, 1876
- Genus Nephurus accepted as Nephrurus Günther, 1876
- Genus Nubilia Gray, 1845
- Genus Nycteridium Günther, 1864
- Genus Oeacurus Agassiz, 1846 accepted as Uroplatus Duméril, 1805
- Genus Oedurella Lönnberg & Andersson, 1913
- Genus Oiacurus Fitzinger, 1843 accepted as Uroplatus Duméril, 1805
- Genus Orraya Couper, Covacevich, Schneider & Hoskin in Couper, Schneider, Hoskin & Covacevich, 2000 accepted as Saltuarius Couper, Covacevich & Moritz, 1993
- Genus Ozziedactylus Wells & Wellington, 1989
- Genus Pachydactylus Wiegmann, 1834
- Genus Palaeogekko Schleich, 1987 †
- Genus Palmatogecko Andersson, 1908
- Genus Paragehyra Angel, 1929
- Genus Paragonatodes Noble, 1921
- Genus Paroedura Günther, 1879
- Genus Pentadactylus Gray, 1840
- Genus Pentadactylus Gray, 1845
- Genus Pepopus Okada, 1936 accepted as Gehyra Gray, 1834
- Genus Peripia Gray, 1845
- Genus Perochirus Boulenger, 1885
- Genus Peroplus Gray, 1842 accepted as Gehyra Gray, 1834
- Genus Peropus Wiegmann, 1835
- Genus Phelsuma Gray, 1825
- Genus Phelsumia accepted as Phelsuma Gray, 1825
- Genus Phyllodactylus Gray, 1828
- Genus Phyllopezus Peters, 1877
- Genus Phyllura Kaup, 1827 accepted as Phyllurus Oken, 1817
- Genus Phyllurus Oken, 1817
- Genus Phyria Gray, 1842
- Genus Phyriadoria Wells & Wellington, 1985
- Genus Platydactyla Kuhl & Hasselt, 1822
- Genus Platydactylus Goldfuss, 1820
- Genus Platypholis Boulenger, 1890
- Genus Platyurus Oken, 1836
- Genus Platyurus Gray, 1845
- Genus Pnoepus Fitzinger, 1843
- Genus Pristiurus Fitzinger, 1843 accepted as Pristurus Rüppell, 1835
- Genus Pristurus Rüppell, 1835
- Genus Pseudoceramodactylus Haas, 1957
- Genus Pseudogecko Brown & Tanner, 1949
- Genus Pseudogekko Taylor, 1922
- Genus Pseudogonatodes Ruthven, 1915
- Genus Psilodactylus Gray, 1864 accepted as Hemitheconyx Stejneger, 1893
- Genus Ptenodactylus Strauch, 1887 accepted as Crossobamon Böttger, 1888
- Genus Ptenopus Gray, 1866
- Genus Pteropleura Gray, 1827
- Genus Pteroplura Gray, 1830
- Genus Ptychozoon Kuhl, 1822 accepted as Gekko Laurenti, 1768
- Genus Ptyodactylus Gray, 1825
- Genus Ptyxozoon Kuhl & Hasselt, 1822
- Genus Puellula Blyth, 1860
- Genus Quantasia Wells & Wellington, 1985
- Genus Quedenfeldtia Böttger, 1883
- Genus Ramigekko Heinicke, Daza, Greenbaum, Jackman & Bauer, 2014
- Genus Rhacoessa Wagler, 1830 accepted as Uroplatus Duméril, 1805
- Genus Rhacogekko Wood et al., 2020 accepted as Gekko Laurenti, 1768
- Genus Rhinogecko de Witte, 1973
- Genus Rhinogekko de Witte, 1973
- Genus Rhodanogekko Hoffstetter, 1946 †
- Genus Rhoptropella Hewitt, 1937
- Genus Rhoptropus Peters, 1869
- Genus Ridegekko Wells & Wellington, 1985
- Genus Saharogecko Joger, 1984
- Genus Sahelogecko Joger, 1984
- Genus Saltuarius Couper, Covacevich & Moritz, 1993
- Genus Saurodactylus Fitzinger, 1843
- Genus Scalabotes Peters, 1880
- Genus Spasmocnemis Dugès, 1883 accepted as Gehyra Gray, 1834
- Genus Spatalura Gray, 1863
- Genus Spathodactylus Günther, 1872
- Genus Spathoscalabotes Boulenger, 1885
- Genus Sphaeriodactylus MacLeay, 1834 accepted as Sphaerodactylus Wagler, 1830
- Genus Sphaerodactylas accepted as Sphaerodactylus Wagler, 1830
- Genus Sphaerodactylits accepted as Sphaerodactylus Wagler, 1830
- Genus Sphaerodactylus Wagler, 1830
- Genus Sphaerodactytus accepted as Sphaerodactylus Wagler, 1830
- Genus Sphariodactylus accepted as Sphaerodactylus Wagler, 1830
- Genus Sphoeriodactylus Gray, 1830 accepted as Sphaerodactylus Wagler, 1830
- Genus Sphoerodactylus Duméril & Bibron, 1836 accepted as Sphaerodactylus Wagler, 1830
- Genus Spiraerodactylus accepted as Sphaerodactylus Wagler, 1830
- Genus Splaerodactylus accepted as Sphaerodactylus Wagler, 1830
- Genus Spliacrodactylus accepted as Sphaerodactylus Wagler, 1830
- Genus Stenodactylopsis Steindachner, 1870
- Genus Stenodactylus Fitzinger, 1826
- Genus Strophura Gray, 1845
- Genus Syndactylosaura Werner, 1910
- Genus Tarentola Gray, 1825
- Genus Tarentula Agassiz, 1846 accepted as Tarentola Gray, 1825
- Genus Tenuidactylus Szczerbak & Golubev, 1984
- Genus Tenuidactylys accepted as Tenuidactylus Szczerbak & Golubev, 1984
- Genus Teratolepis Günther, 1870
- Genus Teratoscincus Strauch, 1863
- Genus Thecadactylus Oken, 1817
- Genus Thecodactylus Wagler, 1830 accepted as Thecadactylus Oken, 1817
- Genus Tolarenta Gray, 1842
- Genus Tolarenta Gray, 1840
- Genus Trachydactylus Haas & Battersby, 1959
- Genus Trigonodactylus Haas, 1957
- Genus Tropiocolotes Peters, 1880
- Genus Underwoodisaurus Wermuth, 1965
- Genus Urocotyledon Kluge, 1983
- Genus Uroplates Gray, 1825 accepted as Uroplatus Duméril, 1805
- Genus Uroplatus Duméril, 1805
- Genus Vanzoia Smith, Martin & Swain, 1977
- Genus Velernesia Gray, 1845
- Genus Wallsaurus Underwood, 1954
- Species Wallsaurus horridus Underwood, 1954 accepted as Homonota horrida Burmeister, 1861
- Species Wallsaurus uruguayensis Vaz-Ferreira & Sierra de Soriano, 1961 accepted as Homonota uruguayensis Vaz-Ferreira & Sierra de Soriano, 1961
- Genus Yantarogekko Bauer, Böhme & Weitschat, 2005 †
- 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
- 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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