Crustaceans

Definition

A diverse group of arthropods that includes crabs, lobsters, crayfish, shrimp, and barnacles, characterized by having a hardened exoskeleton, segmented body, and paired, jointed limbs.

Etymology

From the Latin 'crusta', meaning 'shell' or 'crust'.

Example

Crustaceans like crabs and lobsters play a critical role in marine ecosystems.

Synonyms

• Shellfish

Related Terms

• Arthropods
• Exoskeleton
• Marine biology

Usage Notes

While the term 'crustaceans' is commonly used, it encompasses a wide variety of species that live in both marine and freshwater environments.