Trilobite (Xenasaphus devexus) fossils. These bottom dwelling marine arthropods inhabited seas between the Cambrian and Permian periods (542-250 million years ago). X. devexus lived in the Oligocene (34 to 23 million years ago). This specimen,from the Uchaka formation on the Wolga River,Russia,measures 45 centimetres wide | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5616 px × 3744 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |