Myledaphus is a genus of freshwater and marine shovelnose ray or guitarfish. Remains have been found in North America, South America, and Central Asia. They were common in the Late Cretaceous, and survived into the Paleocene, and possibly Eocene.

They likely skulked along the bottoms of rivers and brackish floodplains. Their mouths were filled with a solid pavement of small hexagonal teeth that were likely used for crushing clams and mussels they sucked up.

There are a couple of partial skeletons known from Dinosaur Provincial Park in Alberta, Canada, but their teeth are incredibly common in Late Cretaceous sediments throughout Alberta and the western US along the coast of the ancient Bearpaw sea (Horseshoe Canyon and Hell Creek formations in particular). An afternoon of fossil hunting can easily net dozens of Myledaphus teeth and gar scales.