Light micrograph of the freshwater eye flagellate Colacium spec. Colacium belongs to the class Euglenophyceae and forms spherical to elliptical sessile cells with multiple, lenticular chloroplasts with pyrenoid and paramylon granules as storage material. Culture material of the algae collection at the University of Cologne (CCAC). Microscopic contrast method : Differential interference contrast. Magnification 188x at a print width of 10 cm.