A water flea (Daphnia sp.) and green algae (Volvox sp.) captured with darkfield and flash by Dr. Ralf Wagner of Dusseldorf, Germany. 
Image Credit: Dr. Ralf Wagner

A water flea (Daphnia sp.) and green algae (Volvox sp.) captured with darkfield and flash by Dr. Ralf Wagner of Dusseldorf, Germany.

Image Credit: Dr. Ralf Wagner