Ogyginus trilobite, illustration Illustration of an Ogyginus trilobite. This arthropod lived 500300 million years ago during the Ordovician period in what is now Wales., by MARK P. WITTONSCIENCE PHOTO LIBRARY Stock Photo - Afloimages
Illustration of an Ogyginus trilobite. This arthropod lived 500-300 million years ago during the Ordovician period in what is now Wales., by MARK P. WITTON/SCIENCE PHOTO LIBRARY