- Marginocephalia, suborder Marginocephalia, marginocephalian - includes bone-headed (pachycephalosaurs) and horned (ceratopsian) dinosaurs
--1 is a kind of animal order
--1 is a member of Ornithischia, order Ornithischia
--1 has members: suborder Pachycephalosaurus; Ceratopsia, suborder Ceratopsia