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PLATYHELMINTHES THE FLATWORMS FLATWORM CHARACTERISTICS • DORSO-VENTRALLY FLATTENED • BILATERAL SYMMETRY • 1 OPENING DIGESTIVE SYSTEM FOOD ENTERS THE MOUTH & WASTES LEAVE THE MOUTH • 3 TISSUE LAYERS: epidermis, gastrodermis, musculodermis • UNSEGMENTED BODY Antennae Mouth & anus underneath the body STRUCTURES OF FLATWORMS EYE SPOTS TUBE LIKE MOUTH ANATOMY OF FLATWORMS • NON-PARASITIC FLAT WORMS ARE FREE-LIVING. EYE SPOT – light sensitive INTESTINE –absorbs nutrients PHARYNX – comes out of body to feed MOUTH – on ventral surface • REGENERATION IN FLATWORMS Many worms have the ability to re-grow lost body parts. MARINE FLATWORM EYE SPOTS LEOPARD FLATWORM LINED FLATWORM BICOLORED FLATWORM SPLENDID FLATWORM ANATOMY OF TAPEWORMS • ALL TAPEWORMS ARE INTESTINAL PARASITES WHICH FEED ON FOOD HEAD has a ring of hooks for grasping flesh SEGMENTS containing eggs break off in intestine TAPEWORM TAPEWORM Display is in the Parasite Museum in Tokyo, Japan How long do you think the worm in the display? Hint: Mrs. Mamo is about 5’3” This worm is close to 30 feet long! Worm’s head TAPEWORM HEAD TAPEWORM HEAD WITH RING OF HOOKS TAPEWORM HEAD TAPEWORM CYSTS IN BEEF &SALMON BEEF TAPEWORM LIFE CYCLE 1. eggs released 5. Uncooked meat is consumed 3. eggs eaten 4. larvae migrate to muscle & form cysts 2. eggs on grass FISH TAPEWORM LIFE CYCLE ANATOMY OF FLUKE WORMS ALL FLUKES ARE PARASITES WHICH FEED ON BLOOD LIVE IN ORGANS LIKE GILLS, HEART, LIVER, LUNGS MOUTH – modified for sucking blood INTESTINES – transport nutrients UTERUS – eggs develop OVARY – produce eggs HERMAPHRODITES TESTIS – produce sperm GILL FLUKE SKIN FLUKE LIVER FLUKE
