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Information from Wikipedia on these unicellular organisms with one or more whip-like organelles called flagella. Although sharing this common structure, they are not a single taxonomic group.
Biologists have been studying a loch on the Scottish Borders over time and provide a list of the algae and other protists found in it, with photographs of each.
Article by Wim van Egmond introducing these organisms with photographs of Euglena, Peranema, Dinoflagellates and Spongomonas, and instructions on growing your own cultures.