1. Flatworms had it FIRST!! _______________________ symmetry
Directional motion =
Cephalization = development of a
__________________ bundle of nerve cells make up a pre-brain
Nerves concentrated at ‘head end’ since sensory cells were concentrated at that end
Sensory nerves formed bundles = ganglion
Eyespots detect
Auricles detect chemicals
2 ____________________ transmit info to rest of body

2. New Innovations in: Excretory System! cellular waste still removed by
flame cells help regulate solute concentration
Evolve in to the nephrons of Mammals kidney
First

3. Flatworm Reproduction
1st ____________________fertilization
Evolutionary advantage
Hermaphrodites
Evolutionary advantage = you can mate with any other member of your species that you can find!
Asexual Reproduction =

4. Ancestral Traits cavity for digestion & circulation Mouth
Respiration by

5. Classes of Flatworm
1) Free living
2) Flukes
3) Tapeworms

6. Swimmer’s Itch =Schistosoma

7. Tape Worms = Class Cestoda

8. Human Tape Worm
Sources =
Prevention

9. Round Worms!
Phylum
1st Complete digestive tract =
1st Separate sexes

11. Round Worms = Phylum Nematoda
1st Animal with a body cavity =
fake body cavity:

12. Types of body cavity (coelom)
Acoelomate Pseudocoelomate Coelomate

13. Digestive Tract
1st Alimentary Canal =
Evolutionary advantage