Sea Spiders Use Their Guts, Not Hearts, To Pump Oxygen

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Antarctic Sea Spiders are as big as a dinner plate (Photo Credit: Ian Phillips – Antarctica.gov.au)

Sea spiders, which have inhabited Earth for over 500 million years, are fascinating creatures. The marine arthropods, which range in size from a millimeter long to as big as a dinner plate, have eight jointed legs that convene around a tiny body. Since their torsos are so small, sea spiders use their legs to conduct normal body functions such as digestion and reproduction. Now, it seems the creatures also have a unique breathing mechanism.

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