Xenodens, derived from Greek and Latin, meaning "strange tooth," is an extinct marine lizard belonging to the mosasaur family. Within this genus, you can find a single species, X. calminechari, with the name originating from Arabic, signifying "like a saw." This unique creature is known to us through fossil evidence discovered in Late Maastrichtian phosphate deposits located in the Ouled Abdoun Basin, Morocco.

Believed to have measured approximately 1 meter (3.3 ft) in length, both the genus and its type species receive their names from the mosasaur's distinctive short, flattened, and blade-like teeth. These teeth collectively create a set of jaws that resemble a saw. This particular characteristic sets Xenodens apart from any other tetrapod, but intriguingly, it shares a resemblance with the jaws of modern dogfish sharks and piranhas.

Paleontologists theorize that Xenodens utilized its remarkably specialized dentition for a diverse diet that likely included cephalopods, crustaceans, fish, and even scavenged remains of marine reptiles. This dietary versatility is believed to be linked to the unique structure of its saw-like jaws.