The world’s largest known scorpion lived about 415 million years ago at a time when other land animals were relatively small, in what is now Britain, a new study has revealed.
Prehistoric creature, named praearcturus gigasIt is estimated to have been about 3.3 feet (1 meter) long and was equipped with formidable pincers about 6.2 inches (16 centimeters) long, according to one statement From Manchester University.
The scorpion may have been a fearsome apex predator that stalked floodplains during the Early Devonian period, when life on land was still in its relatively early stages and dominated by small arthropods. Arthropods are now the most diverse animal groups on earthBecause these include insects, crustaceans, scorpions and spiders.
The discovery that such a large scorpion lived 415 million years ago – long before the appearance of complex terrestrial ecosystems, like a forest – Provides new insights into the evolutionary history of gigantism in arthropods.
“Confirming that this animal is a scorpion fundamentally changes our understanding of how and when these creatures evolved to such extraordinary sizes,” study first author richard howardthe curator of fossil arthropods at the Natural History Museum, London said in a statement.
remains of P. gigasThose recovered so far from locations in England and Wales were first documented in the 1870s, but researchers have long debated what type of animal it was.
fossils of praearcturus gigas In the Natural History Museum, London.
(Image credit: Natural History Museum)
“praearcturus Co-author of study that has puzzled us paleontologists for more than a century Russell Garwooda paleontologist from the University of Manchester said in the statement.
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Researchers initially suspected that the remains represented a large woodlouse-like crustacean. Then in the 1980s, Research It was suggested that the fossils were those of a scorpion. But that explanation came later Challenge: Due to the fragmentary nature of the known remains and the lack of the distinctive scorpion tail.
In the latest study, published Tuesday (June 2) in the journal paleontologyThe authors re-examined the key. P. gigas Samples housed in the collections of NHM using modern imaging and analytical techniques. He also compared them to other fossil material and described recent prehistoric animals that were more confidently identified as scorpions.
Their analysis indicated that P. gigas The study suggests it is likely a scorpion, and the team also reassigned several other specimens found in the same geological formation to this species. Additionally, the researchers suggested that the creature may have been at least partially aquatic based on the presence of flap-like structures called epimera in some of the fossils – similar to the structures that provide support and protection to the hard upper shells of lobsters and crabs.
A fossil showing the pincers of praearcturus gigas.
(Image credit: Natural History Museum)
“Without a complex ecosystem to support praearcturus “On land, these animals probably spend part of their lives hunting in the water,” Howard said at a natural history museum. statement.
A semi-aquatic lifestyle may partly explain the scorpion’s larger size than its modern relatives, as water can support it. big body. But it may also reflect the relative lack of competition from other large terrestrial predators, potentially enabling it to reach sizes that would have been more difficult to achieve had they existed.
“By bringing together material from multiple collections and using state-of-the-art imaging techniques, we have been able to build a clearer picture of the animal than ever before, which is really exciting,” Garwood said.
“what makes praearcturus Interestingly, it became huge at a time when life on land was very young. But this was a world that could somehow support a giant predator.”
Howard, RJ, Garwood, RJ, Edgecombe, GD, and Legg, DA (2026). A revision of Proercturus gigas: a giant scorpion from the Lower Devonian (Lochkovian) of Britain. Palaeontology, 69(3). https://doi.org/10.1111/pala.70064