单词	horseshoe crab
释义	horseshoe crab noun A large marine arthropod with a domed horseshoe-shaped shell, a long tail spine, and ten legs, little changed since the Devonian. Class Merostomata, subphylum Chelicerata: four species, in particular the North American Limulus polyphemus. Many arthropods are also present including the horseshoe crab Mesolimulus and the crayfish Mecochirus.... Where space permits, oysters and jingle shells sometimes anchor themselves to the horseshoe crab. The horseshoe crab, which is not really a crab but more closely related to scorpions and spiders, has been described as an armored box that moves.
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