Mother Nature Network has a photo gallery of ten animals with very long lifespans, including the red sea urchin:
The red sea urchin or Strongylocentrotus franciscanus is found only in the Pacific Ocean, primarily along the West Coast of North America. It lives in shallow, sometimes rocky, waters from the low-tide line down to to 90 meters, but they stay out of extremely wavy areas. They crawl along the ocean floor using their spines as stilts. If you discover one, remember to respect your elders — some specimens are more than 200 years old.
Link via Digg | Photo: Kirt L. Onthank, Wiki Commons.