The term "Order Xiphosura" may not be a familiar term to many, but it actually refers to a group of arthropods that includes horseshoe crabs. For those who find the term difficult to remember or pronounce, there are several synonyms that can be used to refer to this order, including Limulida, Eurypterida, and Merostomata. Each of these terms is widely used in the scientific community and can be just as effective in accurately describing this group of unique and fascinating creatures. So whether you prefer to use the original term or one of these synonyms, know that you can still refer to these intriguing arthropods with confidence and clarity.