Representatives of the Ankylosauria //Figure 2. Representatives of the Ankylosauria: A) the polacanthid Gargoyleosaurus, B) the nodosaurid Sauropelta and C) the ankylosaurid Euoplocephalus. The characteristic features include a low, wide skull with remodeled surface or small pieces of armor fused to it, and a completely modified pelvis to accommodate a wide gut.
Figure 3. Click to enlarge. Kronosaurus in several views. The ribcage is much wider than previously envisioned. The pectoral girdle may be larger, but if so, it is not exposed. The skull is traced from McHenry 2009. Note the rise in the mandible posterior to the jaw joint. This would have prevented overextension of the mandible as it opened, flooding with seawater pushing it even further open. The wide, round torso is more like that of slower-moving plesiosaurs, despite the attractiveness of...