Phylum PLATYHELMINTHES Platy = Flat Helminth = Worm
Jan 13, 2016
Phylum PLATYHELMINTHES
Platy = Flat Helminth = Worm
CHARACTERISTICS• All show BILATERAL symmetry• Posses three tissue (germ) layers:
1. Ectoderm 2. Mesoderm 3. Endoderm• Most exhibit CEPHALIZATION.• Majority Do NOT exhibit segmentation
TYPICAL FLATWORMS
GETTING FOOD• Some flatworms are free-living aquatic
worms. They obtain their food from cruising around and feeding off of tiny living animals or scavenging off of recently dead animals.
• Others are PARASITIC, they feed off of the blood, tissue fluids or tissue cells of their living host.
THREE CLASSES OF FLATWORMS• TURBELLARIA – Free Living Flatworms. Most common example : Planaria
•TREMATODA – Parasitic Flatworms known as flukes, most are less than one centimeter.
•CESTODA – Long Parasitic worms with hooks to attach to intestinal wall of host.
TURBELLARIA - Planarians
TREMATODA - Flukes
Section of Moose Liver Infected with Liver Flukes
LIFE CYCLE OF BLOOD FLUKE
CESTODA - Tapeworms
TAPEWORM REMOVAL
DEWORMING
•Do You Have Pets?
•Do You Have Worms?
- Ever think you have rice in your stool/feces; but you haven’t had rice for a long, long time?