Suborder Cryptodira Cope 1869 

 Subclass *Ichthyopterygia Owen 1860 

 Subclass *Synaptosauria Williston 1912 



Order *Protorosauria Seeley 1871 



Order *Sauropterygia Owen 1859 

 Suborder *Nothsauria Deecke 1866 

 Suborder *Plesiosauria Andrews 1895 

 Suborder *Placodontia Meyer 1863 

 Subclass Lepidosauria Zittel 1890 



Order *Eosuchia Broom 1814 



Suborder *Younginifonnes Romer 1945 

 Suborder *Choristodera Cope 1876 

 Suborder *Thalattosauria Merriam 1904 

 Suborder *Acrosauria Kuhn 1937 



Order Rliynchocephalia Gunther 1886 



Order Squamata Oppel 1811 



Suborder Lacertilia Cuvier 1834 

 Suborder Serpentes Linnaeus 1758 

 Subclass *Archosauria Cope 1891 



Order *Thecodontia Owen 1860 

 Suborder *Pseudosuchia Cope 1891 

 Suborder *Pliytosauria Lydekker 1888 



Order Crocodilia Wagler 1830 



Suborder *Protosuchia Mook 1934 

 Suborder *Sebecosuchia Simpson 1937 

 Suborder *Mesosuchia Mook 1934 

 Suborder Eusuchia Mook 1934 



Order *Pterosauri Kaup 1834 



Suborder *Rhamphorhynchoidea Abel 1919 

 Suborder *Pterodactyloidea Seeley 1866 



Order *Saurischia Seeley 1888 

 Suborder *Theropoda Marsb 1881 

 Suborder *Sauropoda Marsh 1878 



Order *Ornithischia Seeley 1888 



Suborder *Ornithopoda Cope 1869 

 Suborder *Ankylosauria Brown 1908 

 Suborder *Ceratopsia Zittel 1890 

 Subclass *Synapsida Osborn 1903 



Order *Pelycosauria Cope 1878 



Suborder *Ophiacodontia Romer & Price 1940 

 Suborder *Sphenacodontia Romer & Price 1940 

 Suborder *Edaphosauria Romer & Price 1940 



Order *Therapsida Broom 1905 



Suborder *Dinocephalia Broom 1914 

 Suborder *Dicynodontia Owen 1859 

 Suborder *Theriodontia Owen 1859 



Order *Ictidosauria Broom 1912 

 Class Aves Linnaeus 1758 

 Subclass *Archaeornithes Cope 1898 



Order *Archaeopterygiformes Fiirbringer 

 Subclass Neornithes Reynolds 1897 



Superorder *Odontognathae Marsh 1873 



Order *Hesperornithiformes Marsh 1872 



[21] 



