the horsetail crab is a detachment of aquatic helicera from the merostomy class. the name is given by the long xiphoid

merostomata crab horseshoe animal beach marine ocean sea shell life limulus nature outdoors polyphemus wildlife arthropoda background sand seashore biology florida invertebrate isolated tail usa closeup coast arthropod environment fossil animals cephalothorzx water atlantic large tropical woodlouse horse cape white beautiful resilience coastal texture crescentic sandy bay domed