The Ceratopsia (meaning "horned faces")
are an infraorder of herbivorous (plant-eating) dinosaurs, that
were characterized by having beaks.
Early members of this infraorder, such as
Psittacosaurus,
were bipedal (walking on two legs).
Later Ceratopsians tended to be much larger and quadrupedal (walking on
four legs), often had elaborate neck frills and facial horns,
and included dinosaurs such as
Triceratops
and
Styracosaurus.
Ceratopsians first appeared during the
late
Jurassic period
and survived until the
end of the
Cretaceous period.
At the end of the
Cretaceous.
about 65 million years ago,
the last Ceratopsians, along with all the other remaining non-avian dinosaurs,
died out during a
mass extinction.
The Ceratopsia infraorder, together with the infraorders of
Pachycephalosauria ("thick-headed lizards")
and
Ornithopoda ("bird feet"),
form the the suborder Cerapoda of the
Ornithischian
dinosaurs.
Ceratopsians are sometimes grouped together with
Pachycephalosaurs
as the Marginocephalia ("fringed heads"), since the
these two infraorders share some common features and appear to be related.
The skull of Ceratopsians is the most common part of
the animal to be preserved as a
fossil
(in contrast to other dinosaurs, where the skulls are often not found).
Indeed, a number of species of Ceratopsians are known only from
their skulls.
Ceratopsian dinosaurs first appeared during the late Jurassic, about 156 million years ago, and survived until the end of the Cretaceous period, about 65 million years ago
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