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Rotifers are small, mostly freshwater animals, and are amongst the smallest members of the Metazoa -- that group of multicellular animals which includes humans, and whose bodies are organized into systems of organs.delloid rotifers are the commonest variety found in fresh water. The term describes their habit of moving about by extending the body and attatching the head, then catching up with the foot and again extending the body -- bdelloid, like a leech.
That is the basis for the name of this Phylum. There are various taxonomic keys that can be used to identify freshwater rotifers, of which there are more than a thousand species. A good key for species commonly found in lake plankton is Stemberger, R.S. 1979.A Guide to Rotifers of the Laurentian Great Lakes.here are various taxonomic keys that can be used to identify freshwater rotifers, of which there are more than a thousand species. A good key for species commonly found in lake plankton is Stemberger, R.S. 1979. A Guide to Rotifers of the Laurentian Great Lakes.