1. Animal Diversity Classification: Level of organization
Type of symmetry
Germ layers
Coelom (+/-, type)
Development

2. Levels of organization
Cellular
Aggregations of unspecialized cells
Tissue
Specialized cells separated by membranous layers.
Organ
Two or more tissues working together

3. Symmetry Classification by architecture:
Asymmetrical, Radial, Bilateral
Cephalization

4. Germ layers
Diploblastic
Triploblastic
Ectoderm
Endoderm
Mesoderm

5. Coelom = body cavity Function?
Hydrostatic skeleton
Space for organ differentiation
Protection of organs
Freedom of movement

6. Body cavity (coelom) Acoelomate: Pseudocoelomate:
No central body cavity
Pseudocoelomate:
Coelom derived from endoderm + mesoderm
Eucoelomate (coelomate):
Coelom lined with mesoderm
Platyhelminthes

7. Development (check your text for illustrations!)
Protostome
Deuterostome
“First mouth” Blastopore = mouth
“Second mouth” Blastopore = anus
Spiral cleavage, determinate cell division
Radial cleavage, indeterminate cell division
Schizocoelus (coelom from split in mesoderm)
Enterocoelus (coelom from outpocketing of mesoderm)

8. Segmentation Metamerism: Serially repeated segment
Division of labor/specialization
Annelids, Arthropods, Chordates

9. Can you read a tree like the ones we had on the display boards?
(Are you sure?)
Try and find a tree with these traits: Level of organization, Type of symmetry, Germ layers, Coelom, Development and the major animal phyla to make sure!