Origin of water flea
Examples from the Web for water flea
The water-flea, Daphnia (a crustacean), lays two kinds of eggs known as “summer” and “winter” eggs.
In short, she was a branchiopod, to be vulgarly precise, a water-flea."Wee Tim'rous Beasties"|Douglas English
I have already spoken of the fresh-water shrimp and the water-flea (Daphnia pulex).Amateur Fish Culture|Charles Edward Walker