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Prehistoric fossils of large sea scorpions lived 400 million years ago discovered in China.

Imagine meeting a 1-meter long scorpion when an average person is terrified of seeing a regular 5-inch scorpion. Scientists have named the scorpion Terropterus xiushanesis, which belongs to Eurypterids, an extinct anthropod group. These species were seen to have longer basket-type appendages for catching their prey and hence got placed in a group called Mixopterids.
Fossilized remains of at least a 1-meter long scorpion were found in China. Around 400 million years ago, the South China Sea was ruled by this scorpion species; Scientists believe it to be the super predator of its period on Earth. They existed way before the dinosaurs, during the Ordovician Age (480 million years ago), and the scorpion species reached its diversity peak, as scientists stated in the Silurian period (430 million years ago).
This group went extinct from the face of the Earth by the end of the Permian era about 280 million years ago.
A lead author from the Nanjing Institute of Geology and Paleontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Han Wang, stated that known facts about mixopterids are concerned scientists believe that only four species existed based on the fossilized remains found from the Silurian period.
Future work might reveal more groups of eurypterids, as stated by Ms. Han Wang in her paper to the science bulletin.