| Organism | : | Echinoderm Sea urchin |
|---|---|---|
| Species | : | Paracentrotus lividus |
| Description | : | Male and female sea urchins release huge quantities of gametes. The eggs are fertilized in open water where the embryos divide to form 2, 4, 8 cells in a few hours. They then develop into a ball of cells called a blastula. Photo : C. Sardet |
| Project | : | The Plankton Chronicles |
| Website | : | http://www.planktonchronicles.org |
| Tags | : | Embryo Blastula |