Trematodes are more complicated which need at least 1 or 2 intermediate host to complete the cycle The first intermediate host snail The second intermediate host The development of larva Miracidium Ey sporocyst o redia cercaria L metacercaria• Trematodes are more complicated which need at least 1 or 2 intermediate host to complete the cycle. • The first intermediate host :snail • The second intermediate host : • The development of larva: Miracidium sporocyst redia cercaria metacercaria