Limnognathia
L. maerski has very complicated jaws, with fifteen separate parts. The parts of the jaw structure are connected by ligaments and muscles. The jaw parts are very small, ranging from 4 μm to 14 μm. The animal can extend part of its jaw structure outside of its mouth while eating. It also extends much of its jaw structure outside of its mouth when it is regurgitating (pushing out) items that are indigestible.