Most Primitive Echinoderm Discovered

LiveScience has a story on the discovery of the oldest echinoderm ever discovered, some 520 million years old.  Tia Ghose writes:

The newfound species, Helicocystis moroccoensis, has "characteristics that place it as the most primitive echinoderm that has fivefold symmetry," said study co-author Andrew Smith, a paleontologist at the Natural History Museum in London, referring to the group of animals that includes starfish and sea urchins.

Pushing our understanding of how life developed even further.