Dugesia gonocephala, schematic, showing pigment-cup ocelli, nervous system, digestive system
See the photo linked
CC BY-SA 4.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Dugesia_Anatomy_schematic;_with_labels_in_German.svg" title="File:Dugesia Anatomy schematic; with labels in German.svg">File:Dugesia Anatomy schematic; with labels in German.svg</a></li></ul>