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The Vanadis worm, a type of large-eyed bristle worm or polychaeta, exhibits eyesight comparable to that of rodents, enabling it to see UV light, focus on small moving objects, and presumably use this ability for nocturnal activities such as mating and hunting. Remarkably, the worm’s eyes are exceptionally large, weighing about 20 times more than the rest of its head, highlighting their significance in the worm’s survival strategies.
“Together, we set out to unravel the mystery of why a nearly invisible, transparent worm that feeds in the dead of night has evolved to acquire enormous eyes. As such, the first aim was to answer whether large eyes endow the worm with good vision,” says Michael Bok who together with Anders Garm, authors a new research article that does just that.
Precisely what the worms gain remains unclear, particularly because they are nocturnal animals that tuck away during the day, when eyes usually work best. “We have a theory that the worms themselves are bioluminescent and communicate with each other via light. If you use normal blue or green light as bioluminescence, you also risk attracting predators. But if instead, the worm uses UV light, it will remain invisible to animals other than those of its own species.
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