horseshoe crab

anatomy animal animals armoured arthropod arthropoda brown bubbles cheap coast coastal crab creative details domed environment expensive eyes food fossil frame fresh georgia gills group horseshoe invertebrate island isolated large life limulidae limulus marine market merostomata national nature nocturnal ocean outdoors pattern polyphemus price resilience sand sea seafoam seashore shape shell spikelike tail texture thorn unique unusual usa water wild wildlife