These organisms feature a distinctive circular pattern of cilia located at their anterior ends. These cilia serve to transport food particles such as bacteria, debris, and small protozoans towards the mouth. Upon entry into the stomach, a mastax, resembling a jaw-like structure, grinds the food. Flame cells, excretory organs, generate a current that directs waste into either the intestines or the bladder. Possessing transparent bodies, they rely on two robust structures for propulsion, enclosed within a glassy shell secreted by their outer skin.