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.
The latest discovery was made by a team led by University of Montana Associate Professor Arthur Woods. The researchers were curious to see how the spiders’ weak, tiny hearts managed to pump blood and oxygen from the central part of their bodies to the tips of their long, thin legs especially, in the larger Antarctic species.