genus Protoceratops
Euronithopoda
suborder Ornithopoda
Dinosaurian
titanosauriform
marginocephalian
Marginocephalia
suborder Euronithopoda
euronithopod
suborder Pachycephalosaurus
Ornithopoda
Tyrannosaurus rex
Ictodosauria
order Ictodosauria
horned dinosaur
dinosauriform
ceratopsian
diplodocid
allosaur
family Uintatheriidae
Uintatheriidae
genus Allosaurus
genus Antrodemus
suborder Ceratosaura
dinosaurlike
cerapodan
Ornithischia
crocodilian
order Ornithischia
archeopyle
crocodilian reptile
protoceratopsid
ankylosauromorph
dinosaur
diplodocoid
bird-footed dinosaur
theropod
theropod dinosaur
Archaeornithes
subclass Archaeornithes
frill
plateosaurian
archosaurian
neornithischian
archosaurian reptile
archosaur
neornithine
ankylosaurian
megaraptorid
sauropodomorphan