genus Protoceratops
Ceratopsia
suborder Ceratopsia
protoceratops
genus Styracosaurus
genus Triceratops
bone-headed dinosaur
Titanosauridae
family Titanosauridae
genus Psittacosaurus
dinosauric
neotheropod
neornithischian
genus Holbrookia
Holbrookia
suborder Ceratosaura
therizinosaurian
therizinosaur
scansoriopterigid
genus Crotaphytus
genus Chlamydosaurus
Phrynosoma
Crotaphytus
Chlamydosaurus
genus Phrynosoma
genus Brontosaurus
genus Ankylosaurus
genus Apatosaurus
lizardling
deinonychosaurian
neotheropodan
titanosauriform
monstersaurid
genus Coelophysis
genus Barosaurus
reptile family
suborder Pachycephalosaurus
genus Ceratosaurus
psittacosaurus
dino
family Lacertidae
ichthyosaurus
psittacosaur
suborder Theropoda
Lacertidae
Theropoda
thescelosaur
rhabdodontomorphan
neotetanuran
family Lanthanotidae