Two (or more) examples of microlife for the price of one, although the second Closterium is pretty well digested. This particular Frontonia was greedily eating all the diatoms and desmids in my petri dish, so I had to put a stop to it.
BX-60, Flash DIC with a 25/0.70 UplanApo, UCA magchanger, Leitz Variozom (set at 5X in this case), 0.32X projection lens and a D300.
What I really like was that the Frontonia had flattened out the Closterium. Much of the time when I want to take a picture of a Closterium, its not all in one plane. Here you can see the nucleus and much of the desmid in one plane even though you are looking through approximately half of the thickness of the Frontonia. Maybe this is how I should prepare my desmids and diatoms from now on? Have them get partially digested by a Frontonia. Maybe a large Amoeba would work better....