Horseshoe Crab (Limulus polyphemus) — Ancient “Living Fossil” of the Atlantic Coast

The American horseshoe crab, Limulus polyphemus, is often described as one of Earth’s most ancient-looking animals. Despite its common name, it is not a true crab. Horseshoe crabs are arthropods more closely related to spiders and scorpions than to crabs or lobsters. Their armored body, unusual blu...