This bone is found on the top of the skull, between the eyes of the mosasaur. In this jacket, from right to left, the premaxillary, nasals, frontal and part of the parietal are visible. The quadrates of the above Hainosaurus . Like the skull, these bones are truly huge compared to those of most other mosasaurs. One of the large teeth found with this specimen.
Scale is in cm.
These limb bones are much more robust than those of a typical tylosaur and suggests that some of the later mosasaurs were using their front limbs much more than the earlier mosasaurs for directional control or underwater 'flying'. The various bones and other features are labeled in the larger version. A small, unnumbered mosasaur skull from the Pierre Shale in the collection of the Museum of Geology. The scattered elements of this skull probably came from a juvenile Platecarpus . Click here to go to the Museum of Geology Styxosaurus snowii page.