Pteranodon
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaur that included some of the largest known flying reptiles, with wingspans over 8 meters (26 feet). They lived during the late Cretaceous geological period of North America in present-day Kansas, Alabama, Nebraska, Wyoming, and South Dakota. More fossil specimens of "Pteranodon" have been found than any other pterosaur, with about 1,200 specimens known to science, many of them well preserved with nearly complete skulls and articulated skeletons. It was an important part of the animal community in the Western Interior Seaway.
Hyperokynodon
Based on the cast, the total skull length is estimated to have been around . The total body length based on related trematosaurs is estimated to have been to . Like other trematosaurids, "Hyperokynodon" has a narrow skull. The back portion, however, is unusually narrow, approaching that of "Cosgriffius", a lonchorhynchine trematosaurid with a very narrow skull. The snout is moderately elongated with a wide tip. The anterior palatal openings, two holes at the front of the palate, are widely spaced. The vomerine and palatal fangs, two sets of teeth on the roof of the mouth, are very large and laterally compressed. "Hyperokynodon" shares several characteristics with the related "Tertrema", such as the absence of teeth between the choanae.