Limulus polyphemus

Horseshoe crabs are marine and brackish water arthropods of the family Limulidae and the only living members of the order Xiphosura.[2][3] Despite their name, they are not true crabs or crustaceans: they are chelicerates, most closely related to arachnids such as spiders, ticks, … [Read more...] about Horseshoe crab