425-Million-Year Old Parasite Found With Its Host
Ancient example of parasitism caught in action
Dr. David Siveter, Emeritus Professor of Paleontology at the University of Leicester, studied the fossil and discovered three tongue worms - one inside attached to eggs and two on the outside of the crustacean's shell.
Because the fossil was found in an ancient marine environment, it indicates that the tongue worm made the transition to a land animal parasite at some point. The many species of tongue worm today are parasites of reptiles, snakes and humans.