Trilobites: Creatures That Lived 252 Million Years Ago
Trilobites refer to a group of marine artiopodan arthropods that are now extinct. In fact, they are known as the earliest arthropod groups, having existed even during the Early Cambrian period 521 million years back. At the end of the Permian period around 252 million years ago, trilobites are believed to have undergone mass extinction. ...
