Ceratopsia
suborder Ceratopsia
genus Styracosaurus
genus Protoceratops
dinosauric
genus Triceratops
protoceratops
genus Phrynosoma
Phrynosoma
dino
marginocephalian
suborder Marginocephalia
genus Ceratosaurus
Marginocephalia
genus Psittacosaurus
neotheropod
family Titanosauridae
Titanosauridae
titanosauriform
suborder Ceratosaura
neornithischian
genus Coelophysis
genus Ankylosaurus
Holbrookia
genus Holbrookia
armored dinosaur
genus Brontosaurus
genus Apatosaurus
nodosaurian
tyrannosaurid
bone-headed dinosaur
Theropoda
suborder Theropoda
Ceratopsidae
Lacertidae
family Ceratopsidae
scansoriopterigid
family Lacertidae
dinosaurian
suborder Pachycephalosaurus
styracosaurus
styracosaur
neotheropodan
macronarian
genus Crotaphytus
Crotaphytus
Prosauropoda
dinosauromorph
genus Barosaurus
suborder Prosauropoda