Contractile vacuole and nucleus
Gocevia spec.
Diagnosis: amoeba more or less spherical in shape, partly or completely surrounded by a distinct hyaline margin; surface with a layer of foreign bodies; hyaline zone often irregular in outline with conical or digiform subpseudopodia and trailing filaments; nucleus spherical with central nucleolus which shows some lacunae.
Dimensions: c. 20 µm
Ecology: fresh water, in sediments of ditches.
Remarks: This species resembles G. binucleata, but differs in size and the structure of the nucleolus.
Several contractile vacuoles and pseudopodia (arrowed)