Scyphidia is a peritrich ciliate collected from freshwater ponds near Konstanz, Germany. Differential interference contrast.   This picture was taken by Martin Kreutz from Freshwater ponds of Konstanz (Germany.

Micrasterias is a genus of unicellular algae in the family Desmidiaceae. Usually found in oligotrophic, acid waters. This specimen of Micrasterias fimbriata was collected in the Salzburger Land (Austria). Dark field, by Martin Kreutz. Details

Acanthocystis turfacea, a centrohelid heliozoon. The body is coated with a layer of flattened siliceous scales and spine scales. Collected in a pond near Konstanz, Germany. Differential interference contrast. by Martin Kreutz . Details

Lyngbya is a bacterium - a blue green alga or cyanobacterium that contains about 300 cells joined end to end to form a filament. Lyngbya contains chlorophylls and can carry out photosynthesis. Salt marsh. Phase contrast micrograph of living bacteria. Details

Colonial diatom Thalassionema from the waters off Martha's Vineyard. First image by the inaugural protistology workshop team. Details

Solitary radiolarian, with symbiotic dinoflagellates concentrated in two opposed regions and central capsule surrounded by pseudopodial net. Common in the marine water column. Dark ground image by Dave Caron. Details

Uronychia transfuga, marine hypotrich ciliate. Collected from a commercial saltwater aquarium. DIC .  Image by Bill Bourland. Details.

Euglena, collected from Beaver Lake, emphasizes the disk- shaped chloroplasts. The front of the cell is to the left. The light area is called the reservoir. Adjacent to this region is the red eyespot that helps to control the direction in which the cells move. The granular region in the center of the cell is the nucleus.  From 'Seen and Unseen, Discovering the Microbes of Yellowstone' by Kathy Sheehan, David Patterson, Brett Leigh Dicks and Joan Henson, 2005. Details