Scientists discover evolutionary link to modern-day sea echinoderms

Scientists have discovered a new species that lived more than 500 million years ago -- a form of ancient echinoderm that was ancestral to modern-day groups such as sea cucumbers, sea urchins, sea stars, brittle stars and crinoids. The fossil shows a crucial evolutionary step by echinoderms that parallels the most important ecological change to have taken place in marine sediments.

from Latest Science News -- ScienceDaily http://bit.ly/2Y4jENM