beach flea

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various small, jumping crustaceans of the family Orchestiidae, living on sandy beaches at or near the tide line. Also called sand hopper.

Century Dictionary and Cyclopedia

1. n. A name of sundry small amphipod crustaceans. Also called sand-hopper, shore-jumper, and sand-flea.

GNU Webster's 1913

1. n. (Zoöl.) the common name of many species of amphipod Crustacea, of the family Orchestidæ, living on the sea beaches, and leaping like fleas.
2. n. etc. See under Beach, etc.

WordNet 3.0

1. n. small amphipod crustaceans that hop like fleas; common on ocean beaches