Euchlanis, a rotifer with a turtle- like shell (lorica) 

ROTIFERS

by Wim van Egmond

 
 
Rotifers are multicelled animals. Because they are so small most people have never heard of their existence. They are about the same size as the larger unicellular organisms. They don't have a lot of cells, less than 1000, but they have some very special attributes. They are wonders of miniature design.

At the front of the body they possess a crown of hair-like cilia. They locomote by using the crown of cilia (the corona) to propel themselves. Some species walk with head and foot. Their foot can secrete a sticky substance that enables them to attach to a surface.

They also use the crown of cilia to wave food into their mouth. There the food is passed into the 'mastax' where two so-called 'trophi' process the food before it is directed towards the gut. Rotifers are so transparent that all these organs can be observed easily.

They have one or two light sensitive red eye spots.

There is an enormous variety of spectacular body shapes, all to suit the different lifestyles or environmental conditions.

Because many species make so-called resting spores which are easily carried by the wind, they can be found anywhere if there is a little bit of water. Even in a roof gutter or in birdbaths.


Synchaeta, a very transparent predatory rotifer.
 
 

This Collotheca carries an egg near its foot 

The corona, the crown of cilia, can vary in design. Some species don't use it for locomotion but have developed very special capturing devices.

The rotifers from the genus Collotheca live attached to a substrate and collect tiny microbes like bacteria with extremely elongated cilia. To see these anglers under the microscope is a beautiful sight.
 
 

If you like to see more click the thumbnail for a gallery of rotifer images

 
 
 
Read the following MICSCAPE articles to find out more about a variety of rotifers

Rotifers and how to find them

Birth of a rotifer

The rotifer jaw - a look at the jaws of the rotifer Brachionus


  Comments to the author Wim van Egmond are welcomed.

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