Keratella sp. rotifer, focused to the middle of the living individual, showing the brownish stomach region, the chewing apparatus above and the huge red eyespot under the ciliated corona. Keratella is a footless rotifer which possesses a protective covering, or lorica, focused here on the left and right side of the animal. Microscopic contrast technique : Differential interference contrast. Magnification 90x when printed 10 centimetres wide.