A new study found that sea spiders use their extensive gut to pump oxygen through their bodies. Most animals use their heart to circulate blood and oxygen. But sea spiders “breathe” by taking oxygen in through their external skeleton and circulating the oxygen with their gut that runs throughout their bodies, including through their legs.
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Read “Underwater ‘Spider’ Breathes Through Its Legs.”
http://news.nationalgeographic.com/2017/07/oceans-sea-spiders-legs-heart/
These Sea Spiders ‘Breathe’ Through Their Legs | National Geographic
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