Euchlanis is a genus of the microscopic invertebrates known as rotifers. Sometimes alternatively referred to as wheel-animalcules, rotifers feature a characteristic circular arrangement of cilia at their front ends that are reminiscent of a turning wheel when they are in motion. In addition to a ciliated corona, or head, Euchlanis species have transparent bodies and two strong toes used for swimming. They are also sheathed in a glassy shell secreted by their outer skin. Inside, each tiny individual rotifer is surprisingly complex, possessing a brain, bladder, reproductive organs, intestines, and a stomach. They are not endowed, however, with a circulatory system.