Before dinosaurs, giant sea scorpions dominated the oceans for 200 million years.

When Giant Scorpions Swarmed the Seas · 11:41 · Video: PBS Eons · Watch at the source

In short: Sea scorpions, or eurypterids, were incredibly diverse predators that evolved over millions of years. This video explores their unique adaptations, including crushing claws and specialized tails, and explains how some species grew to become the largest arthropods to ever exist.

Eurypterids thrived for 200 million years, showcasing a remarkable range of forms. Their evolutionary journey involved developing sophisticated physical traits, such as flattened tails optimized for swimming and powerful claws used for hunting. These adaptations allowed them to occupy various ecological niches throughout the Paleozoic era.

Beyond their functional anatomy, these creatures are famous for their immense size. Some species reached such significant proportions that they remain the record-holders for the largest arthropods in Earth's history. Their fossilized remains and trackways provide scientists with evidence of their complex behaviors and long-standing dominance in ancient marine environments.

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