Class Merostomata
- King crab (King crab, Horseshoes crab).
- Living Fossil
- nearly extinct, leaving only 3 genera and 4 species only is Limulus polyphemus, Tachyplius gigas (male hormone, testosterone), Tachyplius tridentatus and Carsinoscorpius rotundicauta (pimp cups, Pimp Juice. Hayra)
- horseshoe crabs, sea and brackish water only.
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