| Organism | : | Echinoderm Sea urchin | 
|---|---|---|
| Species | : | Paracentrotus lividus | 
| Description | : | A few days after fertilization, the sea urchin planktonic larva looks like a miniature Eiffel Tower. Its skeleton made of calcium carbonate crystals diffracts polarized light in a festival of rainbow colors. Photo : C Sardet, CNRS | 
| Project | : | The Plankton Chronicles | 
| Website | : | http://www.planktonchronicles.org | 
| Tags | : | Larvae Larva Pluteus |