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ZoomDinosaurs.com
What are Taxonomy and Cladistics How Are Dinosaurs Classified? Dinosaur Genera Not Dinosaurs, but Old and Interesting
Major Dinosaur Families Saurischian Dinosaurs
"Lizard-Hipped"
Ornithischian Dinosaurs
"Bird-Hipped"
Dinosaur Cladogram


ORNITHISCHIAN DINOSAURS

Dinosaurs are divided into two groups based on hip structure, the Order Ornithischia and the Order Saurischia. Harry Seeley, a British scientist, divided the dinosaurs and named the two groups in 1887.

The Ornithischian dinosaurs had a hip structure similar to that of birds, but they were not the ancestors of birds. The pubis bone (part of the structure of the hip) points downwards and toward the tail in Ornithischians, an opisthopubic condition (it points downwards and to the front in the Saurischians) and. The Ornithischian pelvis is wider than the Saurischian pelvis. This may have made Ornithischians more stable while moving.

Ornithischian skulls also had small, reduced openings (antorbital fenestrae) between the eye socket and the nares (nostrils), unlike saurischians.

Ornithischians outnumbered the Saurischians (the lizard-hipped dinosaurs, theropods and sauropods). The Ornithischians were herbivores (plant-eaters).

Major divisions of the Ornithischian dinosaurs:


The following is a sampling of Ornithischian dinosaurs:


(Order) Ornithischia (Bird-hipped herbivores)

O
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O
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Hadrosaurs, the Duck-billed dinosaurs
Anatotitan

ANATOTITAN
Corythosaurus

CORYTHOSAURUS
Edmontosaurus

EDMONTOSAURUS
Lambeosaurus

LAMBEOSAURUS


MAIASAURA


PARASAUROLOPHUS
Hypsilophodontids
Dryosaurus

DRYOSAURUS
Hypsilophodon

HYPSILOPHODON
Iguanodontids


IGUANODON


OURANOSAURUS
Camptosaurids


CAMPTOSAURUS
Thescelosaurids


THESCELOSAURUS
Fabrosauria = Lesothosauria
(primitive Ornithopoda)


HETERODONTOSAURUS


LESOTHOSAURUS


XIAOSAURUS

M
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Ceratopsia (Horned dinosaurs)
More about Ceratopsia


PROTOCERATOPS
Styracosaurus

STYRACOSAURUS


NOTOCERATOPS


TRICERATOPS


MONTANOCERATOPS
Monoclonius

MONOCLONIUS
Pachycephalosauria (Thick-skulled dinosaurs)


PACHYCEPHALOSAURUS


STEGOCERAS

WANNANOSAURUS

Thyreophora
=
Enoplosauria

(Armored
dinosaurs)
Ankylosauridae


ACANTHOPHOLIS


ANKYLOSAURUS


EUOPLOCEPHALUS


HYLAEOSAURUS


MINMI


SAUROPELTA
Stegosauridae


STEGOSAURUS


KENTROSAURUS

ZoomDinosaurs.com
What are Taxonomy and Cladistics How Are Dinosaurs Classified? Dinosaur Genera Not Dinosaurs, but Old and Interesting
Major Dinosaur Families Saurischian Dinosaurs
"Lizard-Hipped"
Ornithischian Dinosaurs
"Bird-Hipped"
Dinosaur Cladogram




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