Environment and Habitat
The ankylosaurs lived from the early Jurassic to the late Cretaceous, (~200 - 65Ma ago). They were more diverse and abundant during the early Cretaceous. Their numbers were in decline during the late Cretaceous with the K-T extinction obliterating them all. The range of the three families of ankylosaurs was most of the world including Antarctica, which was not always covered in ice. Asia was especially diverse in ankylosaurids, but not in nodosaurids. The ankylosaurids habitat was likely inland or upland, which is seen from the lack of fossils in marine sediments. The nodosaurids, however, are believed to have lived near more coastal environments.
This is a map of the Early Cretaceous