Minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms.

synonym: cyclops.

Dutch: waterluis, watervlo
Polish: oczlik

Minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae.

synonym: daphnia.

Dutch: watervlooien, waterluis, watervlo
Polish: rozwielitka, dafnia