Tetanurae
Tetanurae (/ˌtɛtəˈnjuːriː/ or "stiff tails") are a clade which includes most theropod dinosaurs, including birds. Tetanurans first appear in the Jurassic.  It is a large group of theropod dinosaurs.  Jacques Gauthier used the term when he first applied cladistics to vertebrate paleontology.