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Class Merostomata - Horseshoe Crabs

Atlantic horseshoe crab - Limulus polyphemus - male - female Eurypterus remipes
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Merostomata (Horseshoe Crabs)
Numbers
One North American species, Limulus polyphemus.
Remarks
In addition to the order Xiphosura, which includes the horseshoe crabs, this class includes the extinct order Eurypterida, known as sea scorpions.
Internet References