1. UNIT 8 ANIMALS

2. Phylum nematoda Features -bilateral symmetry w/ a pseudocoelom
-outer skeleton
-they shed as grow
-called cuticle
-sexual reproduction
-segmentation

3. 3 groups
-nearly all parasites
Hookworms
Pinworms
Guinea worms

4. PHYLUM ECHINODERMATA (SPINY SKIN)
Features -radial symmetry -water vascular system -internal skeleton of CaCO3 -complete digestive system -regeneration (some) -sexual reproduction

5. 5 classes
Class Crinoidea Ex. Feather stars and sea lilies

6. Class Asteroidea Ex. Sea stars

7. Class Ophinuroidea Ex. Brittle stars and basket stars

8. Class Echinoidea Ex. Sea urchins, sand dollars, sea biscuits

9. Class Holothuroidea Ex. Sea cucumbers