the world > animals > invertebrates > phylum Arthropoda > order Xiphosura or Merostomata > [noun] > member of (4)
an animal of the group Xiphosura, comprising only the genus Limulus; a king-crab.
An arachnid of this order.
A chelicerate arthropod of the class Merostomata, of which the horseshoe crab is the only extant member.