| Organism | : | Echinoderm Sea urchin |
|---|---|---|
| Species | : | Paracentrotus lividus |
| Description | : | The egg elevates a fertilization envelope blocking other sperm from entering. The elevation of this protein barrier participates in the block to the entry of multiple sperm (polyspermy). Sea Urchin Paracentrotus lividus. |
| Project | : | Biologymultimedia |
| Website | : | http://www.biologymultimedia.com |
| Tags | : | Egg |