Rhombodus levis (Cow-Nosed Ray)
Rhombodus levis was a stingray that was quite common during the Cretaceous. Their teeth are rhomboid in shape (aptly named) with a bilobate (two-lobed) root. Their teeth are quite distinct at a glance, and are the most common ray found in SC.
Size: ~5mm across (~1/4 inch)
Scale: 5mm
Age: Late Cretaceous
Teeth
As previously mentioned, these teeth are extremely distinct in their diamond-shape, thus making them very easy to identify.