Image: Ankylosaur diversity There were three types of
ankylosaurs – the nodosaurids, ankylosaurids and polacanthids.
They differed slightly in a number of features including shape
of the skull, structure of the tail, and amount and structure of
body spines and armour. Examples of ankylosaurs include: -
Sauropelta edwardsorum – nodosaurid, USA, 115–112 million years
ago - Euoplocephalus tutus – ankylosaurid, North America, 76–68
million years ago - Gargoyleosaurus parkpini – polacanthid,
North America, 156–146 million years ago - © Australian Museum