This is a very beautiful presentation on flatworms.it can be realyy

1. For class 9

2. ANIMALIA
VERTEBRATES INVERTEBRATES

3. INVERTEBRATES
PORIFERA
CNIDARIA
PLATYHELMINTHES
NEMATODA ANNELIDA
ARTHROPODA
MOLLUSCA
ECHINODERMATA
PROTOCHORDATA

4. ETYMOLOGY
In greek,
Platy-flat
Helminthes-worm

5. BODY ORGANISATION
•Body has tissues, some of which form
organs.
•But well developed organs are absent due
to lack of coelom(internal body cavity).

6. SYMMETRY
•Bilateral symmetry i.e., left and right
side of the body look alike

7. GERM LAYER
The germ layer is triploblastic i.e., body
consists of 3 germ layers namely:
•Ectoderm
•Endoderm
•mesoderm
Flatworms are the first organisms with
mesoderm.

8. STRUCTURE
•The body is flattened dorsiventrally
(dorsal:upper; ventral:lower).
This is why they are also called flatworms.
•The body is either:1.leaf-like(flukes and planaria)
2.ribbon-like(tapeworm)

9. HABITAT

10. PLATYHELMINTHES
FLUKES
PLANARIANS
TAPEWORMS