Age - Miocene Commonality - Very uncommon
The teeth of Isurus retroflexus are are similar to the Eocence mako Isurus praecursor. The distinguishing characteristic is a platform like margin on the labial side of the root. The laterals have more globular crown tips and cusplets may be present even in large teeth from mature individuals. The cutting edge is complete. I only have a few examples from New Jersey so I've included a type specimens of I. retroflexus from Europe obtained thru trades.
Isurus retroflexus anterior
Monmouth County, NJ