The Ornithischia is one of two orders of
dinosaurs
(the other being the
Saurischia
("lizard-hipped") dinosaurs).
This system of classification was devised by
Harry Seeley
in the 1880s, and first published in 1888.
The name "Ornithischia" means "bird-hipped" and
was chosen because of
similarity of the animals' hip bones and pelvic joint to that of
birds
(although birds actually evolved from
Saurischian
("lizard-hipped")
dinosaurs).
All Ornithischian dinosaurs were herbivores (plant-eaters), whereas
in contrast the
Saurischians
included herbivores, omnivores and carnivores.
Other differences from
Saurischians,
include differences in their skulls (smaller holes in front of the eye
sockets known as "antorbital fenestrae"),
the development of armor in many Ornithischians, and an extra bone
in the lower jaw, known as the "predentary".
Ornithischian pelvic bones:
The Ornithischian order has itself been divided into a number of subgroups.
These include:
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