👉 Hyalinocerus is a genus of extinct mammals from the Late Cretaceous period that lived in Europe and Asia during the late Paleogene epoch. They were characterized by large, robust bodies with a high number of ventral teeth (cavellae) and a distinctive lower jaw structure. The most notable characteristic of hyaline ceratosaurus is their long necks, which allowed them to reach for food from above in order to avoid predators.