Trilobite fossil. Fossil of the trilobite Onnia cobboldii. This trilobite lived during the Ordovician period (around 505-440 million years ago). It was distributed over regions now covered by the land masses of Europe,South America and northern Africa. Trilobites are extinct marine arthropods with a hard,segmented shell that is divided into 3 sections. O. cobboldii possessed an unusual body plan: it was very short,with only 5-7 segments forming the thorax. On the head,the cheeks (top left and right) tapered into long,slender spines (only one preserved,lower right) which kept the animal stable when it moved | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Stammers, Sinclair |
Taille de l’image : | 3552 px × 5291 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |