File:Rotifer.jpg

A rotifer taken from standing water. This is probably a Philodina, placed among the bdelloids, and interesting class that does not produce males. Its corona is extended to the upper left, and creates a current that draws small particles of food into the pharynx. Photo by Josh Grosse, 2004.

Source:Wikimedia commons http://commons.wikimedia.org/wiki/Image:Rotifer.jpg