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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.
CLICK on underlined file names and included illustrations to enlarge: The Phylum: Rotifera derives its name from Bearing a wheel or Wheel animacules..There is a prominent circular array of cilia at the anterior end of the animal that looks like a rotating wheel. This is known as the Trochal disc or Corona. Rotifers occur primarily in freshwater and all are microscopic.LICK on underlined file names and included illustrations to enlarge: The Phylum: Rotifera derives its name from Bearing a wheel or Wheel animacules..