Protoceratops_andrewsi

Leptoceratopsidae

Zuniceratops_christopheri

Turanoceratops

Avaceratops_lammersi

Centrosaurus_apertus

Einiosaurus_procurvicornis

Styracosaurus_albertensis

Pachyrhinosaurus_spp

Achelousaurus_horneri

Chasmosaurus_spp

Agujaceratops_mariscalensis

Mojoceratops_perifania

Utahceratops_gettyi

Pentaceratops_sternbergii

Kosmoceratops_richardsoni

Anchiceratops_ornatus

Arrhinoceratops_brachyops

Titanoceratops_ouranous

Eotriceratops_xerinsularis

Triceratops_spp

Torosaurus_spp