Permian period
Permian
Triassic
Triassic period
order Ictodosauria
Ictodosauria
Jurassic
Jurassic period
Cretaceous
Cretaceous period
Carboniferous period
dinosaur
Carboniferous
Mesozoic
crocodilian reptile
Synapsida
crocodilian
subclass Synapsida
order Therapsida
Siderian
Therapsida
hylaeosaurus
reptiliferous
Aegyptopithecus
paleozoology
Triassic-Jurassic extinction event
Cambrian
Eocene
coelophysis
vertebrate paleontology
suborder Ceratosaura
paleodistribution
genus Coelophysis
order Thecodontia
rhynchosaur
Thecodontia
faunachron
Hettangian
Cambrian period
Rhyacian
paleoherpetology
paleohistorical
Anapsida
Coniacian
Paleolithic
subclass Anapsida
Cenomanian
order Rhynchocephalia
Sinemurian
Callovian