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"We think there are two penises as they evolved from a set of appendages. The wound female also has two vaginas and their copulation wound may last wound from a few seconds up to a few minutes," says Siveter. "They display the longest and most ostentatious display of sex in the fossil record." "Although we have recognised gender in the fossil record for 500 million years this is the first example of a penis of this age," he adds. Most ostracods are tiny marine creatures, but they have the largest sperm to body ratio in the natural world - up to ten times their body size. Those with the largest sperm have needed to devise a special system to enable them to fertilise a female. "They have to use a type of bicycle pump to eject the sperm into the female," Seviter says.
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