Dinosaur family tree

Original groups

Traditionally dinosaurs have been divided into two main groups, Ornithischia (bird hipped dinosaurs) and Saurischia (lizard-like hips)

Sauropoda

Diplodocus

Herreras-

auridae

Medium-sized

hunters

Theropoda

T Rex

and birds

Ornithischia

Stegosaurus

Saurischia

Dinosauria

Ornithischia

New reorganisation

Scientists have discovered that T Rex is more closey related to Ornithischia (Stegosaurus) and now lies within a new group called Ornithoscelida

Sauropoda

Diplodocus

Herreras-

auridae

Medium-sized

hunters

Theropoda

T Rex

and birds

Ornithischia

Stegosaurus

Saurischia

Ornithoscelida

Dinosauria

Original groups

Traditionally dinosaurs have been divided into two main groups, Ornithischia (bird hipped dinosaurs) and Saurischia (lizard-like hips)

Sauropoda

Diplodocus

Herrerasauridae

Medium-sized hunters

Theropoda

T Rex and birds

Ornithischia

Stegosaurus

Saurischia

Dinosauria

Ornithischia

New reorganisation

Scientists have discovered that T Rex is more closey related to Ornithischia (Stegosaurus) and now lies within a new group called Ornithoscelida

Sauropoda

Diplodocus

Herrerasauridae

Medium-sized hunters

Theropoda

T Rex and birds

Ornithischia

Stegosaurus

Saurischia

Ornithoscelida

Dinosauria