horseshoe crab

Large littoral arthropod found in North American, Gulf of Mexico, and Asian waters; has a hard carapace shaped like a horseshoe and a stiff tail. A living fossil, dated to around 400 million years ago.
Note that the horseshoe crab is not technically a crustacean.

See also

• List of animals

External links

• Wikipedia: Horseshoe crab
• http://www.sciencefriday.com/video/07/15/2010/beach-season-for-horseshoe-crabs.html (Dead link)