TEM sections of Limnognathia maerski . Muscles highlighted in green. A, transversal section of posterior part. Posterior on the right. B, sagittal section showing the vomit behaviour. C, transversal section of the jaws. The ventral side is on the bottom. D, Close up of muscle attachment on a jaw sclerite, showing the non myoepithelial nature of the jaw muscles. Epidermal cells with blue outlines.