Leanchoilia brain 2.jpg
Nicholas Strausfeld Reconstruction of the brain and segmental nervous system showing the forward eye pair extending from the prosocerebrum, the sideward eyes from the protocerebrum, and four segmental ganglia. Farther back, within the trunk, each segment is equipped with a pair of ganglia that together are linked by a nerve cord extending the length of the body. The blue shaded areas indicate preserved gut tissue. Scale bar represents 2 millimeters.