protorosaur
dinosauriform
tanystropheid
ichthyosauromorph
phytosaurian
protorothyridid
ichthyosauriform
aigialosaurid
pterosauromorph
aphanosaur
dinocaridid
archosaur
dolichosaurid
subarctometatarsus
aigialosaur
order Ichthyosauria
archosauromorph
Ichthyosauria
leanchoiliid
allokotosaur
necrosaur
nothosaurid
archosauriform
casquehead
archegosaurid
phosphatocopid
order Eurypterida
Eurypterida
drepanosauromorph
arctostylopid
stegosaurian
hadrosauriform
baracromian
aeolosaurid
crocodilian reptile
nothosaur
dinosauromorph
archosaurian reptile
crocodilian
archosaurian
archaeopterodactyloid
genus Stenopterygius
neotheropod
neoceratopsian
anomalocarid
Stenopterygius quadrisicissus
pilosaurid
opisthodont
polyglyphanodontian
champsosaur