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Scientists discover ‘biggest bug that ever lived’

Dec 29, 2021, 1:03 PM
Scientists discovered the 'biggest bug that ever lived;' nearly 9 ft. long  Photo: Neil Davies / TU...
Scientists discovered the 'biggest bug that ever lived;' nearly 9 ft. long Photo: Neil Davies / TU Bergakademie Freiberg

 (CNN) — A fossil of a giant millipede found on a beach in northern England has revealed the “biggest bug that ever lived,” paleontologists say.

The fossil was discovered in January 2018 in a chunk of sandstone that had fallen from a cliff onto the beach at Howick Bay in Northumberland. The rock had cracked open, revealing the fossil.

“It was a complete fluke of a discovery,” said Neil Davies, a lecturer in sedimentary geology at the University of Cambridge’s department of earth sciences, who said the fossil was spotted by a former doctoral student.

“It was an incredibly exciting find, but the fossil is so large it took four of us to carry it up the cliff face,” said Davies in a news statement.

The fossilized remains of the creature, named Arthropleura, dated from the Carboniferous Period about 326 million years ago. That’s over 100 million years before the rise of the dinosaurs.

When alive, the creature was estimated to have been 55 centimeters (22 inches) wide and up to 2.63 meters (8.6 feet) in length, weighing 50 kilograms (110 pounds). That would make it the largest-known invertebrate of all time — larger than ancient sea scorpions that previously held this title, the statement said. Invertebrates are animals with no backbone.

“This is definitely the biggest bug that ever lived,” Davies confirmed via email.

It’s only the third Arthropleura fossil to have been discovered. The other two were found in Germany and were much smaller than the new specimen.

To get to such a size, they must have eaten a nutritious diet. At that time, Britain lay on the equator, and invertebrates and early amphibians likely lived off the vegetation growing in a series of creeks and rivers.

The researchers think the fossilized skeleton was likely a moulted segment of exoskeleton that filled with sand, preserving it.

“Finding these giant millipede fossils is rare, because once they died, their bodies tend to disarticulate (separate at the joints), so it’s likely that the fossil is a moulted carapace that the animal shed as it grew,” said Davies in the statement.

“We have not yet found a fossilized head, so it’s difficult to know everything about them,” he added.

Arthropleura animals crawled around for about 45 million years before going extinct. It’s not known exactly why they disappeared, but it could be due to a changing climate that didn’t suit them. Or it could have occurred during the emergence of reptiles, which came to dominate the same type of habitat.

The fossil will go on public display at the Sedgwick Museum in Cambridge, England in 2022. The research was published in the Journal of the Geological Society.

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