Embryo Development

Protostome vs. Deuterostome

Morphological Tree of Life

Molecular Tree of Life

Tree of Life

Starfish Development

Slide of Starfish Development

Several Stages

1. Unfertilized Egg

2. Fertilized Egg

3. Two Cell Stage

3a. Four Cell Stage

3b. Eight Cell Stage

4. Early Blastula

4a. Late Blastula

5. Early Gastrula

6. Late Gastrula

7. Bipinnaria Larva

7a. Bipinnaria Larva

7b. Starfish

8. Radial and Spiral Cleavage