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SUBCLASS SYNAPSIDA
Order Pelycosauria
Order Therapsida
Suborder Biarmosuchia
Suborder Dinocephalia
Suborder Gorgonopsia
Suborder Cynodontia
SUBCLASS ANAPSIDA
Order Testudines
Suborder Pleurodira
Suborder Cryptodira
SUBCLASS DIAPSIDA
Infraclass Lepidosauromorpha
Division Euryapsida
Superorder Pachypleurosauria
Superorder Sauroterygia
Order Placodontia
Order Nothosauria
Order Plesiosauria
Division Ichthyosauria
Superorder Lepidosauria
Order Sphenodontia
Order Squamata
Suborder Lacertilia
Suborder Serpentes
Infraclass Archosauromorpha
Division Archosauria
Subdivision Crurotarsi
Superorder Crocodylomorpha
Order Crocodylia
Subdivision Ornithodira
Order Pterosauria
Suborder Rhamphorynchoidea
Suborder Pterodactyloidea
Superorder Dinosauria
Order Saurischia
Suborder Theropoda
Suborder Sauropodomorpha
Order Ornithischia
Suborder Thyreophora
Suborder Cerapoda
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