Urchins of the Seas

If you haven’t really been paying attention for the last 450 million years or so of Earth’s history, London’s Natural History Museum offers a tidy way to catch up with a diverse, venerable group of marine invertebrates known as echinoids. Spectacular color images highlight important distinguishing characteristics of each type of sea urchin. Find out how sea urchins walk and how to sort out the pores on the underside of sand dollars.

Go to: http://www.nhm.ac.uk/palaeontology/echinoids/