A marine worm discovered off an Italian social gathering island has grown monumental eyes that weigh about 20 instances greater than the remainder of its head.

The eyes of the nocturnal Vanadis bristle worm are so giant that if people had eyes proportionally as large, they'd add an additional 100kg to our heads.

Scientists have now found their huge eyes are very delicate to ultraviolet (UV) mild and might be used to secretly talk with one another within the ocean darkness.

Their large eyes are additionally extremely developed and work in the identical approach as human eyes. Outside of people, no different vertebrates together with bugs, spiders, octopi and squid, have this sort of eyes.

"To be able to see in enough detail and at a high enough frame rate to be able to identify specific objects is actually kind of unusual," mentioned Michael Bok from Lund University, one of many marine biologists who investigated the worm's distinctive eyes.

"Their eyes are strangely very sensitive to ultraviolet light," added Mr Bok.

Worms might talk utilizing mild

The researchers suspect the bristle worms have developed to see a brand new sort of bioluminescence - a sort of chemical mild animals can produce.

"As far as we know, there's no ultraviolet bioluminescence in nature. Everything is green or blue colours so this would be a completely new thing," Mr Bok mentioned.

As no different animal is thought to make use of UV bioluminescence, the worms would have the ability to simply spot one another within the deep sea and talk utilizing their very own sort of sunshine.

'Very highly effective behavioural driver'

The findings from Lund University, Copenhagen University and Tuscia University additionally show how shortly eyes can evolve.

The closest relative to the Vanadis is nearly fully blind and backyard worms, who're in the identical household because the bristle worm, do not even have eyes - they've receptors that may inform them whether or not it's mild or darkish.

That suggests the bristle worm's eyes have developed in a short time, in evolutionary phrases.

"These worms have massively expanded on their eye structure for something, so there's got to be some very powerful behavioural driver for this to have happen," mentioned Mr Bok added.

After solely ever coming throughout one among them, Mr Bok hadn't even thought it was doable to check the worms within the wild. They are invisible in daylight so are exhausting to hunt.

"Randomly one day, I saw this video on YouTube of thousands of these worms swarming around some divers," he mentioned.

"That got me really excited. There was a place where we could actually go collect them."

'I freaked out once I noticed them'

He contacted the divers within the video who had filmed the worms within the Mediterranean close to Ponza, an Italian island recognized for its summer season nightlife.

One of the divers, Armando Macali, a biologist from Tuscia University, provided to take Mr Bok and collaborator Anders Garm from Copenhagen University out to gather some worms.

"He said we would find them every day and we were a little bit sceptical. We'd never seen them in the wild before besides one individual [years before]," Mr Bok mentioned.

"But, sure enough, when we jumped in the water the first night, there's hundreds of them everywhere."

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He added: "I freaked out at the first one I saw. I grabbed it in a plastic bag and frantically swam it back to the boat because I was so excited that we had one.

"Then I rotated and I noticed them coming into the dive lights, and there [were] a whole bunch of them."

The group went again every evening and picked up samples of the distinctive worm.

"I was pretty ecstatic and excited," Mr Bok added.

"When you see these things, they've got these big, bulbous beach balls bouncing around on the side of their head as they're swimming. So you know right away that definitely a [bristle worm], nothing else looks like that."

Mr Bok and his colleagues are heading again to Ponza in two weeks to seek out out precisely how the worms use their "remarkable" eyes.