Temporal range: 99.6–61.7 Ma Cretaceous to Paleogene
The bivalves that lived during this time included gigantic animals, possibly having extremely thick shells, such as the inoceramids (Volviceramus, Platyceramus, etc...). Given its large size, though, this species of Ptychodus might also have eaten ammonites and primitive turtles, like Desmatochelys.
It is believed to have been a sluggish bottom-dwelling shark, rather than an actively fast swimmer. It lived about 89 million years ago (Turonian stage). Therefore, while only large numbers of its teeth, and jaw fragments are known, it might have resembled a massive nurse shark or a sand tiger shark.
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