Fairy shrimp: any of various transparent freshwater crustaceans of the order anostraca that lack a carapace and characteristically swim upside-down.

Biologists with the Idaho national guard have discovered a new species of fairy shrimp living in the oft-dry lake beds of Idaho's desert.

Any of various aquatic crustaceans of the subclass Branchiopoda, such as the fairy shrimp and water flea, characterized by a segmented body and flattened, leaflike thoracic appendages.