Xiphosura

Definition

An order of marine chelicerate arthropods commonly known as horseshoe crabs, characterized by a hard carapace and a long, spike-like tail.

Etymology

From Greek 'xiphos', meaning 'sword', and 'oura', meaning 'tail', referring to the shape of their tail.

Example

Xiphosura are often studied for their blue blood, which contains a substance valuable in medical applications.

Synonyms

• Horseshoe crabs

Related Terms

• Chelicerata
• Arthropods
• Limulus

Usage Notes

Despite being called crabs, Xiphosura are more closely related to arachnids than to crustaceans.