Crustacean

**Semantic type:** Food

**Definition:** Distributed worldwide, crustaceans are distinguished by having two pairs of antenna-like appendages in front of the mouth and other paired appendages near the mouth that act like jaws. Most species are marine, including shrimps and barnacles. Some, including crayfishes, live in freshwater habitats; others (e.g., sand fleas, land crabs, and sow bugs) live in moist terrestrial environments.

**Synonyms:** - Crustacean Shellfish