Figure 1

Larvae of Microphallus papillorobustus in whole mount brains of G. insensibilis. (a) The arrow indicates a mature metacercaria encysted in the protocerebrum, while the arrowhead points to a young larva partially melanized in the deutocerebrum of a gammarid with altered behavior (MAD). Red lipidic granules are seen at the surface of the brain. (b) A dead metacercaria is encapsulated and melanized in the protocerebrum of a normal gammarid. Anterior is up in these whole mounts viewed with a stereomicroscope. The brains are approximately 1 mm wide.