Flatworms

- Flatworms are the simplest of the worm groups. 
- There are about 20,000 species in this group. 
- They are found many places and can be free living or parasitic. 
- Flatworms are invertebrates. 
- Some examples of flatworms are tapeworms, flukes and planaria.

- Flatworms are found in marine and fresh water. 
- The binomial nomenclature of flatworms is Phylum Platyhelminth.

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The appearance of a flatworm can be microscopic or many feet long and is generally very thin.

System types:

Muscular-Skeletal System
A flatworm has no skeleton. It has tiny bristles called cilia that help it move as well as two layers of muscles under its skin.


Digestion and Excretion
A flatworm has a combination digestive/excretory system. It takes food in and gets rid of wastes through the same opening.


Nervous System
A flatworm has a very simple nervous system with two nerve cords running down either side. It has two simple brains called ganglia, which are simple bundles of nerves. It has two eyespots that help it sense light.


Respiration
A flatworm takes in oxygen, but has no formal respiratory system.


Reproduction
A flatworm reproduces by splitting in two. When a flatworm is split up it immediately forms a new flatworm.


Done by: Carisa Chan
Group 4: Carisa, Su En, Shamemi, Pei Shan

(Group 3, Animalia: Flatworms, Roundworms, Segmented Worms and Mollusca)