Dog-sized scorpion once roamed the waters off prehistoric China

A prehistoric fossil of a sea scorpion the size of a dog has been uncovered in the Lower Silurian region of South China, the first time a large eurypterid has been found in this part of the world.

The fossil belongs to Terropterus xiushanensis gen. et sp. nov., a member of the Mixopterids, a group of eurypterids characterized by specialized arms lined with special teeth-like structures used to catch prey in a kind of basket catch as it stalked the sea floor.

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