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What type of symmetry do flatworms have?
Bilateral Symmetry - can divide into mirror halves
Anterior, posterior, dorsal, ventral
head, tail, back, belly
Advantages of Bilateral Symmetry
moving and active feeding
Organisms that belong to Class Turbellaria
non-parasitic flatworms, live in water
how do planaria get around?
ventral side covered with cilia, creat a goo path and cilia moves it forward
planaria get rid of waste?
waste diffuses out the body wall.
planaria use for osmoregulation?
Flame Cells-flagulla push water into a system of tubles then out the organism.
- ocellia- eyespots
- Auricles-protrutions on the head
Flukes belong to what class?
What is a parasite?
organism that lives in or on another organism
How do flukes feed?
have suckers that attatch the fluke to the host
4 characteristics flatworms have
- 1) bilateral symmetry
- 2) cephalization-sense organs & nevous control
- 3)triploblastic - 3 cell layers
- 4) Acedomate- no open space
phylum flatworms belong to
gastrovascular cavity of a planaria
- 3 trunks, 1 anterior, 2 posterior
- trunks branch to increase surface area
How does planaria gather their food?
pharynx extends out the mouth for feeding
3 cell layers. mesoderm produces more advanced organs
- Free living, non-parasistic flatworms
- parasitic flatworms, either interngal or external
- parasistic, internal