Rotifers are
one of the smallest multicellular organisms. They range
from 0.04 to 2 millimetre in size. You can find them in
almost every kind of fresh water. They are great fun to
watch through a microscope. Because they are so
transparent all internal organs can be seen. In the movie
of Brachionus we can see on the right the two
crowns of hairlike cilia it uses to sweep in food
particles. In the centre of the body the 'mastax', a
chewing and grinding device processes the food towards
the stomach. The food can be seen as brown substance. A better
view of the crown of cilia can be seen in the movie of Limnias
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