Jurassic shark: Shark from the Jurassic period was already highly evolved

Cartilaginous fish have changed much more in the course of their evolutionary history than previously believed. Evidence for this thesis has been provided by new fossils of a ray-like shark, Protospinax annectans, which demonstrate that sharks were already highly evolved in the Late Jurassic.

from Top Environment News -- ScienceDaily https://ift.tt/1klLX2f