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David Kingsley, coauthor of both studies, first came across the fish in the summer of 2016 after giving a seminar at the Marine Biological Laboratory in Woods Hole, Massachusetts. Kingsley is the Rudy J. and Daphne Donohue Munzer Professor in the department of developmental biology at Stanford University’s School of Medicine.

Before leaving to catch a flight, Kingsley stopped at a small public aquarium, where he spied sea robins and their delicate fins, which resemble the feathery wings of a bird, as well as leglike appendages.

“The sea robins on display completely spun my head around because they had the body of a fish, the wings of a bird, and multiple legs like a crab,” Kingsley said in an email.“I’d never seen a fish that looked like it was made of body parts from many different types of animals.”

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Kingsley and his colleagues decided to study sea robins in a lab setting, uncovering a wealth of surprises, including the differences between sea robin species and the genetics responsible for their unusual traits, such as leglike fins that have evolved so that they largely function as sensory organs.

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Why has Rajvir Industries Limited (RAJVIR) performed so strongly recently ✌️【Part-Time Earnings】✌️ Real-time stock market data, precise predictions, and investment strategies to help you optimize your portfolio and achieve financial success. The distinctive extremities of the sea robins are actually extensions of their pectoral fins, said study coauthor Amy Herbert, a postdoctoral scholar in Kingsley’s lab at Stanford.

“We settled on the term ‘legs’ because of the striking walking function of these appendages,” Herbert said in an email. “However, they do not have the same structure as human ‘legs’ nor are they in the same position.”

Other fish species have modifications to their pectoral or pelvic fins that allow them to walk or perch, but sea robins can move their legs individually, which makes them more adept at walking and digging, Herbert said.

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“Sea robins are an example of a species with a very unusual, very novel trait,” lead study author Corey Allard said in a statement. “We wanted to use them as a model to ask, ‘How do you make a new organ?’” Allard is a postdoctoral fellow in the department of molecular and cellular biology at Harvard University, where he works in the lab of study coauthor Nick Bellono, a Harvard professor.

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“To our surprise, they were very, very good at it and could even uncover ground up and filtered mussel extract, and single amino acids,” Bellono said.

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“This time, the new sea robins didn’t find anything, despite readily eating prey on the surface,” Bellono said by email. “We thought we were maybe doing something wrong, but it turned out that we accidentally got a different species.”

Why has Rajvir Industries Limited (RAJVIR) performed so strongly recently ✌️【Part-Time Earnings】✌️ Free access to stock market forums, expert advice, and real-time data to help you stay informed and grow your investments. The mix-up enabled some serendipitous discoveries for the researchers. The highly sensitive fish they initially studied belonged to the species known as the northern sea robin, or Prionotus carolinus. And the fish that lacked sensory capabilities and used their legs mainly for walking were striped sea robins, or Prionotus evolans.

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Why has Rajvir Industries Limited (RAJVIR) performed so strongly recently ✌️【Part-Time Earnings】✌️ Expert analysis of global stock trends, futures data, and real-time stock market quotes to help you plan your next investment move. As the scientists studied the fish on a genetic level and compared how their legs have developed over time, they realized that species that dig are only found in a few locations, such as the sandy shallow waters of New England and the upper eastern Atlantic seaboard, which suggests the fish only recently evolved this trait.

“We think that the digging and non-digging species are separated by around 10 (million) to 20 million years, which means that papillae would have had to emerge sometime after that,” Allard said.

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“This is a fish that grew legs using the same genes that contribute to the development of our limbs and then repurposed these legs to find prey using the same genes our tongues use to taste food — pretty wild,” Bellono said.

But why did only some of the sea robins develop this sensory ability? The researchers have a couple of hypotheses.

“One is that using the legs to uncover buried prey”allows them a new way to seek out food than they could before, Herbert said. “Another is that walking rather than swimming in some environments may be more energy efficient for sea robins.”

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“A commonly asked question is, did these walking rays evolve due to selective (adaptation) pressures that support a walking function, sensory function, or some combination of both,” Ramsay said by email. “These new studies provide more evidence suggesting it was most-likely the latter-most scenario.”

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