tapeworms (cestoda: caryophyllidea), parasites of fish under the microscope for education

background biology caryophyllidea catfish cell cestoda cestode cyst cysts diphyllobot disease eggs fish flatworm freshwater head helminth hook host infection intestine japonicum laboratory larva magnification medical medicine microscope microscopic microscopy muscle parasite parasitic parasitology platyhelminthes proglottid rostellum roundworms samples scientific scolex slide solium taenia tapeworm tissue whipworm worm zoology