Illustration of Pikaia gracilens, an eel-like chordate known from fossils in the Burgess Shale site (508 million years old) in British Columbia, Canada. The Burgess Shale fossil site records a key moment in Earth's history, the Cambrian Explosion, when an unprecedented period of evolution produced a wide diversity of body types, including those of today's animals. It is thought that Pikaia was the first chordate, a possible ancestor to today's vertebrates. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / JOSE ANTONIO PENAS |
Taille de l’image : | 5091 px × 3432 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |