A boy holding a horseshoe crab.
any of an order (Xiphosura, class Merostomata) of sea arthropods shaped like the base of a horse's foot and having a long, spinelike tail
Any of various marine arthropods of the order Xiphosurida, especially Limulus polyphemus of eastern North America, having a large rounded body and a stiff pointed tail. Also called king crab, limulus.
(plural horseshoe crabs)