Xiph·os·ura | \ ˌzifəˈsu̇rə \
Definition of Xiphosura
: an order of arthropods comprising the horseshoe crabs and extinct related forms and usually including only the two recent genera Limulus (synonym Xiphosurus) with representatives along the American coast of the Atlantic and Tachypleus with species along the Asiatic coast of the Pacific
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