A Devonian pterygotid eurypterid playground in China.
Pterygotids (Eurypterida; Pterygotidae), known more commonly as ancient sea scorpions, were large apex predators of the Silurian-Devonian marine realm, and included some of the largest arthropods in Earth’s history, with some species reaching up to 2.5 meters in length. They are the only family of eurypterids to be found globally in marine deposits owing to their domination of the Mid-Palaeozoic seas.































