Gonium are colonial flagellates. The colony measures about 90 microns across. Colonies have 4, 6, 8, 16, or 32 cells. Shown is a 16 cell colony. Individual cells resemble Chlamydomonas as each cell has two flagella, an eye spot and a chloroplast.

Gonium make food from sunlight, favor water with high organic content and are readily available from science supply companies.