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Horseshoe crab

The horseshoe crab (Limulus polyphemus) is an arthropod that is more closely related to spiders than crabs.

Horseshoe crabs possess the rare ability to regrow limbs lost.

Limulus has been extensively used in research into the physiology of vision.

Note:   The above text is excerpted from the Wikipedia article "Horseshoe crab", which has been released under the GNU Free Documentation License.
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