What are some traits and characteristics of horseshoe crabs?
The horseshoe crab belongs to the large group of invertebrates (animals without backbones) called Arthropods. This group also includes lobsters, crabs, insects, spiders, and scorpions. Even though it looks crab-like, with a hard shell and claws, the horseshoe crab is more closely related to scorpions and spiders. http://www.ocean.udel.edu/horseshoecrab/… http://en.wikipedia.