Maximum likelihood tree for the scalloped hammerhead shark, Sphyrna lewini.

The tree was constructed with a 652 bp cox1 gene fragment and ran for 1,000 bootstrap replications. DNA sequences of the sharks can distinguish those from the Pacific, Atlantic, and Indian Oceans except for two sequences from Florida, (FJ519393 and FJ519394), which form a distinct group sister to all other sequences of S. lewini. Only bootstrap values higher than 70% are shown on the branch.