World's oldest sperm found in Australian fossil
The world's oldest and best preserved sperm has been discovered in 17 million-year-old fossils unearthed in far north Queensland. The sperm of an ancient species of freshwater shrimp, which were found inside a rock taken from the Riversleigh World Heritage area, were not only hardy, but huge compared to the animal's body size. The not-so-little swimmers were as long as the crustacean itself, which was only a couple of millimetres in length.
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