Tardigrades

Tardigrades

These micrometazoários, are popularly known as "water bears" and are rarely seen in the extended aeration systems, which feed on the cell contents of nematodes, rotifers and protozoa, and some kinds of algae. ts body is short, plump and on the abdomen shows four pairs of stubby legs, which serve for locomotion. They are affected by small concentrations of ammonia, being completely nitrified effluent indicators.