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| Some members of the Suborder Marginocephalia, otherwise known as the Marginocephalians, are on this page. Names in bold type refer to species extant in the middle period of the Mesozoic Era, which is rather more familiar as the Jurassic Period. Otherwise the creatures lived in the time periods noted. |
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Anchiceratops / Cretaceous
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| Chasmosaurus / Cretaceous
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| Pachycephalosaurus / Cretaceous
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| Pentaceratops / Cretaceous
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| Protocerasaurus / Cretaceous
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| Styracosaurus / Cretaceous
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| Torosaurus / Cretaceous
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| Triceratops 1 / Cretaceous
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