horseshoe crab(redirected from Xiphosurida)
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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.
(Animals) any marine chelicerate arthropod of the genus Limulus, of North America and Asia, having a rounded heavily armoured body with a long pointed tail: class Merostomata. Also called: king crab
any of several large marine arthropods of the order Xiphosura, esp. Limulus polyphemus, of E North American shores, having a stiff tail and brown carapace curved like a horseshoe. Also called king crab.
Any of various marine arthropods that have a large rounded shell that covers the body, two large compound eyes on the shell, and a stiff pointed tail. Horseshoe crabs are not in fact crabs, but belong to an ancient order of arthropods related to the spiders and extinct trilobites.
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|Noun||1.||horseshoe crab - large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse|
arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin