Dilophosaurus

This skeleton of Dilophosaurus shows the hipbones with the forward-pointing pubis, characteristic of saurischians. Hipbones support the huge muscles that move the legs. This agile carnivore had powerful legs, and its fingers and toes had the sharp claws typical of theropods.

Dilophosaurus was 19/2 ft (6 m) long.

Dinosaur Hipbone

Clawed ; feet hipbone The name saurischian means "lizard-hipped," and saurischian dinosaurs were so called because their hipbones were like those of lizards.

This means that the pubis bone pointed forward, while the ischium bone pointed backward.

Clawed ; feet

T ued npnnQ Early theropod

J. Dilophosaurus lived during

T he group of dinosaurs .■ ^ period. An agile predator, called the theropods '■ it was one of the first large carnivorous were the killers of the dinosaur ^^^ dinosaurs. world. Often large and ferocious, these carnivores usually walked on their two clawed rear feet. Theropod means "beast feet," but their feet were very birdlike. Each foot had three toes for walking on, with long foot bones that added to the length of the legs. Sharp-clawed hands were often used for attacking and catching hold of prey.

Fossil find Coelophysis hunted lizards and small dinosaurs. But in this fossilized Coelophysis skeleton, there are skeletons of young of the same species among the ribs, indicating that Coelophysis was

Coelophysis Hand And Claws

Coelophysis was 10 ft (3 m) long.

Bones of young in ribcage

Coelophysis was 10 ft (3 m) long.

Bones of young in ribcage

Theropod facts

• All theropods were carnivores.

• Coelophysis was one of the first theropods, living about 220 million years ago.

• Tyrannosaurus rex was one of the last theropods, living 65 million years ago.

• Many theropods had no fourth or fifth fingers.

• At least five vertebrae supported the pelvis of theropods.

Toothless beak

Toothless beak

Long, slender neck

Backbones were held stiffly in place by s ligaments.

Slender arms and hands may have held prey to mouth ___

Long, slender neck

Backbones were held stiffly in place by s ligaments.

Slender arms and hands may have held prey to mouth ___

The end of the tail was very stiff and probably helped Ornithomimus steer when running.,

Dilophosaurus Skeleton

The end of the tail was very stiff and probably helped Ornithomimus steer when running.,

Like ostriches The ornithomimosaurs are also known as "ostrich dinosaurs" because of their resemblance to modern ostriches. They had toothless beaks and long, flexible necks. The legs were very long and slender - well designed for fast running.

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