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The world’s largest scorpion lived 415 million years ago

Summary by Science News
A prehistoric scorpion was the largest ever to exist, and it may have preyed on land and freshwater species.

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The discovery of a marine scorpion of colossal dimensions in the province of Teruel has placed Spain as a world reference in the study of prehistoric invertebrates. Experts from the Geological and Mining Institute of Spain (IGME-CSIC) have rescued under Aragonese geology some remains that date from 400 million years ago. The relevance of the finding is absolute, not only because of the magnitude of the specimen, but because of the exceptionality…

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The recent discovery of the remains of the world’s largest scorpion rightly places the Iberian peninsula at the center of the international panorama of the paleontology of invertebrates. A group of scientists from the Geological and Mining Institute of Spain (IGME-CSIC) located this huge fossilized treasure under Aragonese rocks, an unprecedented fact. The first laboratory analyses confirm that the animal inhabited these lands about 400 million …

A fossil that has been intriguing scientists for more than 150 years is probably the largest known scorpion. Of a length of about one meter, this building about 415 million years old Praearcturus gigas was four to five times the size of the largest species of modern scorpion (Gigantometrus swammerdami), the researchers report on June 2nd [...]

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Science News broke the news in United States on Wednesday, June 24, 2026.
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