Theoretical classroom lessons will be carried out using audio-visual didactics. Practical laboratory activities will be carried out using specific techniques of in vivo study and dissection of species belonging to the main phyla of invertebrates (Cnidari, Anellidi, Arthropods, Molluschi, Echinoderms) used as a model of study. Observation of the optical microscope of fresh preparations of the main tissues and / or organs (gills, trachea, ovaries, testicles and others). Students will be urged and attended the various phases of the teaching through discussion and comparison. Students will also be urged to discuss and collaborate in the various activities