 This result supports the counterintuitive idea that the first hammerhead shark to evolve had a large cephalofoil.It also supports the separation of "Eusphyra" from "Sphyrna" by keeping the latter monophyletic (including all descendants of a single ancestor).The winghead shark lineage is estimated to have diverged from the rest of the hammerheads some 15–20 million years ago during the Miocene.