Nomarski differential interference contrast image of Eudorina. Eudorina consist of either 16, 32 or 64 (mostly 32) cells embedded in a spherical mass of gelatinous material. Each cell contains a chloroplast (giving them a green color), a red eyespot and two flagella. Eudorina are a free-swimming colonial green algae commonly found in ponds and farm puddles, usually in sufficient concentrations to make the water green.
B0007560 Eudorina (green algae). Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/