| Organism | : | Echinoderm Sea urchin |
|---|---|---|
| Species | : | Paracentrotus lividus |
| Description | : | In the sea urchin, fertilization is external and occurs when sperm and egg meet in open water, thus producing millions of embryos. Photo : N Sardet, CNRS |
| Project | : | The Plankton Chronicles |
| Website | : | http://www.planktonchronicles.org |
| Tags | : | Embryo Egg Fertilization |