Campanella umbellaria

These protists belong to the group ciliates.  They have a bell like shape attached to a stalk.  These bells can grow in colonies on top of the stalks.  There are many other ciliates that have bells attached to stalks and collectively are called bell animalcules. 

Image Credit: Charles Krebs

Campanella umbellaria

These protists belong to the group ciliates.  They have a bell like shape attached to a stalk.  These bells can grow in colonies on top of the stalks.  There are many other ciliates that have bells attached to stalks and collectively are called bell animalcules. 

Image Credit: Charles Krebs