The Rotifer Brachionus

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

More about Rotifers can be found in 'The Smallest Page on the Web' 


Wim van Egmond 1999

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