Borodinopristis Schwimmeri is an extremely rare cretaceous sawfish with very unqiue rostral spines and oral teeth. In a paper by Dave Cicimurri, he publiched an assemblage from a Donoho Creek Formation lag deposit in which he collected macro and micro fossils. He collected a total of 3,614 specimens - in those he only found 1 Borodinopristis Schwimmeri oral tooth and no rostral spines. Its rostral spines are similar to those of ptychotrygon in size, only being 2-3mm long, however they are very distinct as they have 3 “wrinkles” on the way up the crown.

Size: 1-2mm

Scale: N/A

Age: Late Cretaceous