Swedish team finds world's oldest sperm

Swedish researchers have announced the discovery of the world's oldest known animal sperm, the TT news agency reports.

Researcher Benjamin Bomfleur, along with colleagues from the Swedish Museum of Natural History, made the discovery last year while studying cocoons recovered from Seymour Island in Antarctica with an electron microscope.

The fossilized sperm cells are believed to be 50 million years old, and belonged to a previously unknown worm-like creature.

"The cocoons worked like protective cases for embryos, sperm and eggs," said Bomfleur.

According to Swedish Television, the sperm is 10 million years older than the previous oldest known animal sperm.