eurypterid

Eurypterids, also known as sea scorpions, are a group of extinct arthropods that lived during the Paleozoic era, from the Late Cambrian to the Permian period. They are characterized by their distinctive body structure, which includes a cephalothorax and a segmented abdomen, similar to modern arachnids. Eurypterids had a pair of large, lobster-like claws on their abdomen, which they used for predation and defense. Their eyes were large and compound, and they had a pair of antennae and a pair of walking legs. Eurypterids were marine creatures and are known from fossils found in various parts of the world, including North America, Europe, and Australia. They are believed to have been active predators, feeding on a variety of marine organisms. Eurypterids went extinct during the Permian-Triassic extinction event, which is one of the most severe mass extinctions in Earth's history.