Pikaia swimming in a Cambrian sea. Illustration of Pikaia gracilens, an eel-like chordate known from fossils in the Burgess Shale site (508 million years old) in British Columbia, Canada, swimming in a Cambrian sea. 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. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / JOHN SIBBICK |
Bildgröße: | 2683 px × 3354 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |