Chlamydomonas is a unicellular green alga and is found all over the world. There are over 500 species. It is used by researchers to explore basic biological questions such as how organisms respond to various stimuli. Chlamydomonas can reproduce sexually by fusion of two cells. Note the various fusing gametes.

Part of the Collection of the Protist Department of the Micropolitan Museum © Wim van Egmond