Water bears, 1-millimeter long eight-legged creatures that have been known to survive the vacuum of space, are the toughest animals we’ve ever studied. How did they come to be this way?
Tardigrades are some of the most compelling organisms to have ever evolved on Earth. Also known as water bears, these 1-millimeter long eight-legged creatures have been known to survive the vacuum of space, withstand boiling water for at least an hour, endure high amounts of radiation, and make it through unscathed from some of the most extreme colds imaginable. As a result, tardigrades have managed to find a home on nearly every place on the planet.
Tardigrades are descended from an extinct organism known as lobopodians, which lived on the planet during the. Lobopodians themselves are an informal group of ancient marine worms with several stubby legs that lived in the ocean. Up until now, however, we’ve never been able to drill down exactly what groups of lobopodians today’s tardigrades may descend from., are the result of an analysis of 79 different subcategories of lobopodians, including 40 species of tardigrades.
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