In what can be described as somewhat of an accident, Benjamin Bomfleur of the Swedish Museum of Natural History discovered what is now known to be the oldest sperm ever, from an ancient worm.

Oldest worm sperm ever found in Antarctica. Image 1.

Image: Washington Post

The 50 million-year-old specimen was originally foraged by Thomas Mörs, a paleobiologist. While on an expedition in Seymour Island in Antarctica, he stumbled upon a fossilized cocoon. 

Through radiometric dating, it was discovered that the specimen was most likely the sperm of crayfish worm. The sticky cocoon also contained remnants of clam shells and other small animals.