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A life reconstruction of the newly named giant scorpion, Praearcturus gigas, in its Early Devonian habitat.(Image credit: © Franz Anthony High Res)Share this article 0Join the conversationFollow usAdd us as a preferred source on GoogleSubscribe to our newsletter
The planet’s largest recognized scorpion inhabited an era when other terrestrial creatures were comparatively diminutive, approximately 415 million years ago in the region now known as the U.K., a recent investigation reveals.
The extinct arthropod, designated Praearcturus gigas, is thought to have attained lengths of about 3.3 feet (1 meter) and possessed formidable pincers measuring approximately 6.2 inches (16 centimeters) in length, according to an announcement from the University of Manchester.
This arachnid was likely a formidable top predator that roamed floodplains during the Early Devonian Period, a time when terrestrial life was still in its nascent stages and characterized by small arthropods. Arthropods are currently the most varied animal phylum on Earth, encompassing insects, crustaceans, scorpions, and spiders.
The finding that such a massive scorpion existed 415 million years ago — well before the emergence of intricate terrestrial ecosystems, like forests — provides novel perspectives on the evolutionary trajectory of gigantism within arthropods.
“Validating that this creature is indeed a scorpion fundamentally alters our comprehension of how and when these beings evolved to such remarkable magnitudes,” stated study lead author Richard Howard, curator of fossil arthropods at the Natural History Museum, London, in the announcement.
Fossilized remnants of P. gigas, so far unearthed in England and Wales, were initially documented in the 1870s, but scientists have long debated the precise nature of the animal.
Fossils of Praearcturus gigas in the Natural History Museum, London.
(Image credit: The Natural History Museum)
“Praearcturus has perplexed us paleontologists for over a century,” remarked study co-author Russell Garwood, a paleontologist at the University of Manchester, in the announcement.
Initially, researchers theorized that the remains represented a large crustacean resembling a woodlouse. Subsequently, in the 1980s, research suggested the fossils pertained instead to a scorpion. However, that hypothesis was later contested due to the incomplete nature of the known remains and the absence of the distinctive scorpion tail.
In the most recent study, published on Tuesday (June 2) in the journal Palaeontology, the authors re-examined crucial P. gigas specimens housed in the NHM’s collections employing contemporary imaging and analytical methodologies. They also juxtaposed these with other fossil material and recently identified prehistoric fauna more definitively classified as scorpions.
Their examination indicated that P. gigas is most likely a scorpion, and the research team also reclassified several other specimens recovered from the same geological stratum to this species, as detailed in the study. Furthermore, the researchers proposed that the creature might have been partly aquatic, inferred from the presence of epimera—wing-like structures similar to those that provide structural support and shielding for the rigid upper carapaces of lobsters and crabs—in some of the fossilized remains.
A fossil showing the pincer of Praearcturus gigas.
(Image credit: The Natural History Museum)
“Absent extensive terrestrial ecosystems to sustain Praearcturus, these animals likely spent periods of their lives hunting in aquatic environments,” Howard stated in a Natural History Museum press release.
A semi-aquatic existence could partially account for the scorpion’s considerable size relative to its modern-day counterparts, as water offers buoyancy to large bodies. However, it might also reflect the comparative scarcity of competition from other large land predators, potentially allowing it to achieve sizes that would have been more challenging to attain if such competitors were present.
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“By consolidating material from multiple archives and utilizing state-of-the-art imaging techniques, we have managed to construct a more lucid depiction of the creature than was previously feasible, which is truly exciting,” Garwood commented.
“What renders Praearcturus so captivating is its immense size during an epoch when terrestrial life was otherwise quite small. Yet, it existed in a world capable of supporting a colossal predator.”
