They have been found in western North America, Europe and East Asia. Good specimens are rare; most are known only from fragments, and bits of their armour.
Scelidosaurus, whose remains had been found in England, was described by Richard Owen in 1861. Its exact position in the group is still not yet agreed. It was a largely quadrupedal armoured animal from the Lower Jurassic, feeding on low scrubby plants. This is pretty much a description of many dinosaurs in this group.
