Upper and lower dental plates of Ray
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Superorder: Batoidea
Description
The Stingrays settle on the bottom while feeding, and it is feeds primarily on molluscs, crustaceans, and occasionally on small fish. Some stingrays’ mouths contain two powerful, shell-crushing plates. The dental plates of a ray is characteristic of a cockscomb shape, with heavy, bent, oblique cusps, strong distal cusplets and prominent serrations but no blades, cusps of lower teeth not prominently protruding when mouth is closed 18 to 26, 18 to 25 rows of teeth are present in the upper and lower dental plates respectively.
Reference:
http://islanublar.jurassicworld.com/dinosaurs/pteranodon
https://www.livescience.com/24071-pterodactyl-pteranodon-flying-dinosaurs.html
https://www.newdinosaurs.com/pteranodon