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Classification of lower tetrapods Class Reptilia Linneus 1758 Subclass Parareptilia Olson 1947
Order Procolophonomorpha
Suborder Procolophonia
Superfamily Procolophonoidea Family Nyctiphruretidae Efremov 1938 Family Procolophonidae Seeley 1888
Suborder Pareiasauroidea Family Lanthanosuchidae Efremov 1946 Family Nycteroleteridae Romer 1956 Family Pareiasauridae Seeley 1888 Family Bradysauridae Huene 1948 Order Chelonia brongniart 1800 Suborder Proganochelydia ROMER 1966 Suborder Casichelydia GAFFNEY 1975
Subclass Eureptilia
Order Diadectida
Suborder Diadectomorpha
Family Diadectidae
Order Captorhinida
Suborder Captorhinomorpha
Family Protorothyrididae
Family Captorhinidae Case
1911
Order Araeoscelida
Family Petrolacosauridae
Order Choristodera
Family Champsosauridae Infraclass Lepidosauromorpha Superorder Lepidosauria
Order Sphenodontida
Family Sphenodontidae
Superorder Sauropterygia Order
Placodontia Cope
1871 Suborder Placodontoidea Cope 1871 Family Placodontidae Cope 1871 Family Paraplacodontidae Peyer & Kuhn-Schnyder 1955
Suborder Cyamodontoidea
Nopcsa
1923 Superfamily Cyamodontida Romer 1956 Family Henodontidae F.v. Huene 1948 Family
Cyamodontidae Nopcsa
1923 Infraclass Archosauromorpha
Superorder Archosauria
Order Thecodontia
Suborder Proterosuchia
Family Proterosuchidae
Suborder Ornithosuchia
Family Euparkeriidae
Suborder Aetosauria
Family Stagonolepididae
Order Chelonia brongniart 1800 (Latreille 1800) Suborder Proganochelydia Romer 1966 Family Proganochelyidae Baur 1888 Suborder Casichelydia GAFFNEY 1975 Infraorder Cryptodira Cope 1868 Family Pleurosternidae Cope 1868 Family Kallokibotionidae Nopcsa 1923 Family Solemydidae Lapparent de Broin & Murelaga 1996 Family Thalassemydidae Zittel 1889 Family Eurysternidae Dollo 1886 Family Plesiochelyidae Baur 1888 Superfamily Chelonioidea Oppel 1811 Family Osteopygidae Zangerl 1953 Family Protostegidae Cope 1872 Superfamily Dermochelyoidea Fitzinger 1843 Family Dermochelyidae FITZINGER 1843 Superfamily Trionychoidea Fitzinger 1826 Family Trionychidae Fitzinger 1826 Family Cyclanorbidae LYDEKKER 1889 Family Peltochelyidae Seeley 1880 Superfamily Carettochelyoidea Boulenger 1887 Family Carettochelydidae Boulenger 1887 Family Kinosternidae Agassiz 1857 Family Staurotypidae GRAY 1869 Superfamily Chelydroidea gray 1831 Family Platysternidae gray 1869 Family Dermatemydidae gray 1870 Superfamily Testudinoidea batsch 1788 Family Testudinidae batsch 1788 Superfamily Emydoidea Rafinesque 1815 Family Emydidae Rafinesque 1815 Infraorder Pleurodira COPE 1864 Family Proterochersidae Nopcsa 1928 Family Platychelyidae Bräm 1965 Family Dortokidae Lapparent de Broin & Murelaga 1996 Superfamily Pelomedusoides Cope 1868 Family Pelomedusidae Cope 1868 Superfamily Podocnemidoidea Cope 1868 Family Bothremydidae Baur 1891 Family Podocnemididae Cope 1868 Superfamily Chelidoidea Gray 1825
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