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SAUROPSIDA: THE ANCESTORS OF REPTILES AND BIRDS

This page features the earliest groups of sauropsids - the mesosaurs, parareptiles and the first true reptiles - the latter group giving rise to lizards, snakes, crocodilians, dinosaurs and the latter's offspring, the birds.

	Sauropsida \| Mesosauria †Brazilosaurus
	Sauropsida \| Mesosauria †Mesosaurus
	Sauropsida \| Mesosauria †Stereosternum
	Sauropsida \| Parareptilia †Eunotosaurus
	Sauropsida \| Parareptilia \| Millerettidae †Milleretta
	Sauropsida \| Parareptilia \| Millerettidae †Broomia
	Sauropsida \| Parareptilia \| Millerettidae †Millerosaurus
	Sauropsida \| Parareptilia \| Millerettidae †Milleropsis
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Feeserpeton
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Lanthanosuchus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Acleistorhinus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Delorhynchus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Colobomycter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha †Australothyris
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha †Microleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria †Erpetonyx
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria \| Bolosauridae †Eudibamus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauridae †Bolosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria \| Bolosauridae †Belebey
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Nyctiphuretidae †Abyssomedon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Nyctiphuretidae †Nyctiphruretus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Barasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Candelaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Owenetta
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Ruhuhuaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Saurodektes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Coletta
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Kitchingnathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Lasasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Phaanthosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Pintosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Sauropareion
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Suchonosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Tichvinskia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Hwiccewyrm
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Koiloskiosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Mandaphon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Neoprocolophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Pentaedrusaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Phonodus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Hypsognathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Leptopleuron
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Libognathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Soturnia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Basileosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Sclerosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Scoloparia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Anomoiodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Burtensia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Eumetabolodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Insulophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Lestanshoria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Orenburgia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Kapes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Procolina
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Procolophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Samaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Teratophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Timanophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Thelephon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Thelerpeton
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Theledectinae †Eomurruna
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Theledectinae †Theledectes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Macroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Bashkyroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Rhipaeosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae \| Nycteroleterinae †Emeroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae \| Nycteroleterinae †Nycteroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Bradysaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Bunostegos
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Deltavjatia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Embrithosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Parasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Anthodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Nanoparia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Provelosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Pumiliopareia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Arganaceras
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Pareiasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Sanchuansaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Scutosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Shihtienfenia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia \| Elgininiinae †Elginia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia \| Elgininiinae †Obirkovia
	Sauropsida \| Eureptilia \| Captorhinidae †Captorhinoides
	Sauropsida \| Eureptilia \| Captorhinidae †Acrodenta
	Sauropsida \| Eureptilia \| Captorhinidae †Baeotherates
	Sauropsida \| Eureptilia \| Captorhinidae †Captorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Euconcordia
	Sauropsida \| Eureptilia \| Captorhinidae †Labidosauriscus
	Sauropsida \| Eureptilia \| Captorhinidae †Opisthodontosaurus
	Sauropsida \| Eureptilia \| Captorhinidae †Protocaptorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Reiszorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Rhiodenticulatus
	Sauropsida \| Eureptilia \| Captorhinidae †Romeria
	Sauropsida \| Eureptilia \| Captorhinidae †Saurorictus
	Sauropsida \| Eureptilia \| Captorhinidae †Thuringothyris
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Balearosaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Captorhinikos
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Gansurhinus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Gecatogomphius
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Kahneria
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Labidosaurikos
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Labidosaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Moradisaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Rothianiscus
	Sauropsida \| Eureptilia \| Romeriida †Paleothyris
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia †Spinoaequalis
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Petrolacosauridae †Petrolacosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae †Zarcasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Kadaliosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Araeoscelis
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Aphelosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida †Claudiosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Kenyasaurinae †Kenyasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Acerosodontosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Hovasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Tangasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Younginidae †Thadeosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Younginidae †Younginia
	*NEODIAPSIDA* Click here to learn more

	Sauropsida \| Mesosauria †Brazilosaurus
	Sauropsida \| Mesosauria †Mesosaurus
	Sauropsida \| Mesosauria †Stereosternum
	Sauropsida \| Parareptilia †Eunotosaurus
	Sauropsida \| Parareptilia \| Millerettidae †Milleretta
	Sauropsida \| Parareptilia \| Millerettidae †Broomia
	Sauropsida \| Parareptilia \| Millerettidae †Millerosaurus
	Sauropsida \| Parareptilia \| Millerettidae †Milleropsis
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Feeserpeton
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Lanthanosuchus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Acleistorhinus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Delorhynchus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Lanthanosuchoidea †Colobomycter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha †Australothyris
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha †Microleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria †Erpetonyx
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria \| Bolosauridae †Eudibamus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauridae †Bolosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonomorpha \| Bolosauria \| Bolosauridae †Belebey
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Nyctiphuretidae †Abyssomedon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Nyctiphuretidae †Nyctiphruretus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Barasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Candelaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Owenetta
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Ruhuhuaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Owenettidae †Saurodektes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Coletta
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Kitchingnathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Lasasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Phaanthosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Pintosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Sauropareion
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Suchonosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae †Tichvinskia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Hwiccewyrm
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Koiloskiosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Mandaphon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Neoprocolophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Pentaedrusaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Phonodus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Hypsognathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Leptopleuron
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Libognathus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Soturnia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Basileosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Sclerosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Leptopleuroninae †Scoloparia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Anomoiodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Burtensia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Eumetabolodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Insulophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Lestanshoria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Orenburgia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Kapes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Procolina
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Procolophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Samaria
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Teratophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Timanophon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Thelephon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Procolophoninae †Thelerpeton
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Theledectinae †Eomurruna
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Procolophonoidea \| Procolophonidae \| Theledectinae †Theledectes
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Macroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Bashkyroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae †Rhipaeosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae \| Nycteroleterinae †Emeroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Nycteroleteridae \| Nycteroleterinae †Nycteroleter
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Bradysaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Bunostegos
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Deltavjatia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Embrithosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria †Parasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Anthodon
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Nanoparia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Provelosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Pumiliopareiasauria †Pumiliopareia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Arganaceras
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Pareiasaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Sanchuansaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Scutosaurus
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia †Shihtienfenia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia \| Elgininiinae †Elginia
	Sauropsida \| Parareptilia \| Ankyramorpha \| Procolophonia \| Pareiasauromorpha \| Pareiasauria \| Velosauria \| Therischia \| Elgininiinae †Obirkovia
	Sauropsida \| Eureptilia \| Captorhinidae †Captorhinoides
	Sauropsida \| Eureptilia \| Captorhinidae †Acrodenta
	Sauropsida \| Eureptilia \| Captorhinidae †Baeotherates
	Sauropsida \| Eureptilia \| Captorhinidae †Captorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Euconcordia
	Sauropsida \| Eureptilia \| Captorhinidae †Labidosauriscus
	Sauropsida \| Eureptilia \| Captorhinidae †Opisthodontosaurus
	Sauropsida \| Eureptilia \| Captorhinidae †Protocaptorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Reiszorhinus
	Sauropsida \| Eureptilia \| Captorhinidae †Rhiodenticulatus
	Sauropsida \| Eureptilia \| Captorhinidae †Romeria
	Sauropsida \| Eureptilia \| Captorhinidae †Saurorictus
	Sauropsida \| Eureptilia \| Captorhinidae †Thuringothyris
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Balearosaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Captorhinikos
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Gansurhinus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Gecatogomphius
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Kahneria
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Labidosaurikos
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Labidosaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Moradisaurus
	Sauropsida \| Eureptilia \| Captorhinidae \| Moradisaurinae †Rothianiscus
	Sauropsida \| Eureptilia \| Romeriida †Paleothyris
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia †Spinoaequalis
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Petrolacosauridae †Petrolacosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae †Zarcasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Kadaliosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Araeoscelis
	Sauropsida \| Eureptilia \| Diapsida \| Araeoscelidia \| Araeosceloidea \| Araeoscelidae \| Araeoscelinae †Aphelosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida †Claudiosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Kenyasaurinae †Kenyasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Acerosodontosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Hovasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Tangasauridae \| Tangasaurinae †Tangasaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Younginidae †Thadeosaurus
	Sauropsida \| Eureptilia \| Diapsida \| Neodiapsida \| Younginiformes \| Younginidae †Younginia
	*NEODIAPSIDA* Click here to learn more

°Arcus°

SAUROPSIDA: THE ANCESTORS OF REPTILES AND BIRDS

This page features the earliest groups of sauropsids - the mesosaurs, parareptiles and the first true reptiles - the latter group giving rise to lizards, snakes, crocodilians, dinosaurs and the latter's offspring, the birds.