Saccamoeba stagnicola Page, 1974

Diagnosis: cyst-forming, no cytoplasmic crystals; endocytic bacteria in all known strains; cysts with circular or slightly oval outline, usually sticky coat.

Ultrastructure: cup-like surface structures, c. 25 nm in diameter; mitochondria often elongate.

Dimensions: 30-75 µm long (mean 50 µm); L/B about 4.2 nucleus 4.5-8.5 µm (c. 6.5 µm); cysts 12-19 µm (mean 15 µm)

Ecology: fresh water, Europe.