1. WARM UP
Why are animals (and other organisms) classified into similar groups?
What are two of the characteristics used to classify animals?

2. Animal Phylogeny

3. Phylogeny
An “tree of life”
Based on evolutionary connections

4. Phylogeny
Classification by similar characteristics

5. Phylogeny Ancestral characteristics shared by distant ancestors
Derived characteristics that are new in a group

6. Clades
No Tissues
Porifera
Tissues
All other phyla

7. Clades
Radial Symmetry
Cnidaria
Bilateral symmetry
All others*

8. Clades Acoelomates Pseudocoelomates Coelomates Platyhelminthes
Nematoda
Coelomates
All others

9. Clades Protostomes Deuterostomes
Mouth first, coelom from outside space
Mollusca, Annelida, Arthropoda
Deuterostomes
Mouth second, coelom from gut wall
Echinodermata and Chordata

10. WRAP UP
List the key adaptations or characters that identify the phylum Echinodermata.