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Invertebrate Classification

Invertebrates represent 97% of animal species and are organized into 30 phyla.

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Blue Blood
Teacher Contributed

Blue Blood


Horseshoe Crabs

Why It Matters

This Won't Hurt At All

Limulus polyphemus) have touched your life. Watch this video and find out how.

Have you ever been given a shot by a doctor? What about an antibiotic? Know anyone who has ever had surgery? Well, if the answer to any of these questions is yes, then horseshoe crabs (Limulus polyphemus) have touched your life. Watch this video and find out how.


 Use the resources below to answer the following questions:

  1. What makes the horseshoe crabs blood blue? 
  2. How does horseshoe crab blood (HCB) benefit people?
  3. How does the immune system of the horseshoe crab compare to the immune system of humans? How does this help explain the usefulness of horseshoe crab blood to humans?
  4. How does the harvesting of horseshoe crab blood affect the animals?
  5. What is hemocyanin?

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