Edited by Alison Young, some rights reserved (CC BY-SA)
Photo Credits
- 1. (c) WoRMS for SMEBD, some rights reserved (CC BY-NC-SA)
- 2. (c) Ria Tan, some rights reserved (CC BY-NC-ND)
- 3. (c) http://www.guidopicchetti.it, some rights reserved (CC BY-SA)
- 4. (c) Christophe Quintin, some rights reserved (CC BY-NC)
- 5. (c) 1999 California Academy of Sciences, some rights reserved (CC BY-NC-SA)