Evolution of vipers (merfolk)

The ''vipers'' are semi aquatic humanoids species with webbed fingers on both hands and feet, they also have 2 fins on each leg and their legs are covered in scales from the feet up to their knees.

Also, they are moderately fit or at least like the average gym rats naturally and can grow to be massive when trained properly as adults.

Having both lungs and a pair of gills located on their chest right underneath the neck grants them the ability to breath underwater and on land.

The vipers live in the same world with mermaids, and both species are descendants of humans. Considering both vipers and mermaids evolved alongside one another, why did the mermaids evolve a fish tail while the vipers evolved fins on the legs, or should the real question be what reason did vipers have to live on both land and water and not be fully aquatic like mermaids?

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Evolution of vipers (merfolk)

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