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
A large marine arthropod with a domed horseshoe-shaped shell, a long tail-spine, and ten legs, little changed since the Devonian.
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