Newly-discovered ancient crab species is like nothing science has seen before

When researchers discover fossils of species that are new to science it's only natural that they attempt to find a place for them in the colossal tree of life, matching them up with related species that may even exist today. A newly-discovered species of ancient creature is pushing that practice to its absolute limit. Tiny fossils discovered in both Columbia and the United States reveal the existence of a pint-sized marine animal that lived some 90 million years ago. It's being called a crab, bu...