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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.
Introduction to the Rotifera Rotifers : the wheel animalcules Rotifers are microscopic aquatic animals of the phylum Rotifera. Rotifers can be found in many freshwater environments and in moist soil, where they inhabit the thin films of water that are formed around soil particles. The habitat of rotifers may include still water environments, such as lake bottoms, as well as flowing water environments, such as rivers or streams.