User:MasonHintermeister/sandbox

Ptychocorax is an extinct genus of anacoracid Mackerel Shark from the Late Cretaceous. It is known for its unusual heterodont dentition, likely reflective of a shift from eating vertebrates to a diet of hard-shelled prey. Teeth in the front of the mouth are serrated and blade-like, similar to other close relatives like Squalicorax, while posteriors are blunt and sometimes rugose like those of Hybodont sharks. Due to the difference in tooth morphology, some past authors have placed the anterior teeth in the anacoracid genus Squalicorax and the posterior teeth in the hybodont genus Acrodus. However, lateral teeth exhibiting a mixed morphology has shown Ptychocorax to be a valid genus. Two species are known: P. aulaticus and P. hybodontoides. P aulaticus is from the Santonian.