1. Round Worms! Phylum Nematoda
1st Complete digestive tract = alimentary canal
1st Separate sexes

3. Round Worms = Phylum Nematoda
1st Animal with a body cavity =pseudocoelom
Fake body cavity – just a space between layers.

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

5. Digestive Tract
1st Alimentary Canal = one way digestive tract with mouth at one end and an anus at the other
Evolutionary advantage
Specialization
Can eat new meal before the old one is finished processing

6. Alimentary Canal

7. Spicule injects sperm for internal fertilization
Spicule inside body
Spicule extended

8. Ascaris…………………………… One of the most common parasite of humans
Up to 64% of
people in some
S.eastern states
Eggs injested
on Vegetables
or from Soil

9. Hookworm in Humans Eggs in feces on ground Juviniles live in soil
juviniles burrow into human skin
Travel in bloodstream to lungs
Juvilinles coughed up & swallowed
Mature in small intestine
Adults suck blood from intestine wall (cause anemia)
Common in Southern States

10. Heartworm Larva in Blood