1. Phylum Platyhelminthes

2. Basic Facts Name meaning: flatworm Phylum divided into 3 classes
Invertebrate
Bilateral Symmetry
Cephalization
Contains body organs
Digestive, reproduction, excretory and nervous

3. Basic Facts cont….
Habitat: some species are free-living, most are parasites
Contain a blind gut digestive system
Exchange gases through diffusion
Flattened body
Reproduction:
Primarily asexual, hermaphroditic
Fission

4. Class Turbellaria Free living flatworms May contain ocelli
Ex. Planarian

6. Class Trematoda Parasitic flatworms known as flukes
Cause a disease known as Schistosoma
Live in liver, lung and blood of host
Passed through water that is contaminated by human feces, urine or blood.
Have an intermediate host in life cycle
Aquatic snail

7. Schistosoma life-cycle

8. Infection with a blood fluke

9. Class Cestoda Parasitic tapeworms Live in the intestines of hosts
Can grow to the length of host intestine or longer
Infection caused by ingesting eggs of worm

10. Typical Tapeworm Body Plan
Scolex w/hooks and suckers for attachment
Immature Proglottid: Sections of tapeworm body
Mature Proglottid: Sections of tapeworm body (contain eggs)

12. Tapeworm Photos
Scolex
Hooks

13. Cycle of Infection

14. Tapeworm Infection

16. Flatworms Platyhelminthes Cephalization Blind Gut Diffusion Fission
Ocelli
Intermediate Host
Fluke
Scolex
Proglottid

17. Name that Vocab Term A digestive system with only one opening
Eyespots used for detecting light
A body plan characteristic of organisms that have an identifiable head
A type of asexual reproduction where the organism splits in half to create a copy
A grouping of animals common referred to as flatworms.
The exchange of gases through a membrane or skin.