praearcturus

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Praearcturus is the name associated with the world's largest known scorpion species that lived around 400 million years ago during the Devonian period in what is now the UK.

Praearcturus, identified from fossils dating back about 415 million years, represents the largest scorpion species ever discovered. This giant prehistoric arthropod, measuring more than three feet long—comparable to the size of a medium dog—roamed ancient Britain during the Devonian period. Scientists have analyzed these fossils to better understand the scale and ecology of early terrestrial life, highlighting the diverse and expansive nature of prehistoric ecosystems.