Ancient swimming jellyfish fossils reveal Earth's oldest species

The oldest species of swimming jellyfish, Burgessomedusa phasmiformis, has been discovered in 505 million-year-old fossils found at Burgess Shale in Canada. The well-preserved fossils provide insight into the evolutionary history of jellyfish, which have been difficult to study due to their delicate nature. The discovery suggests that the Cambrian food chain was more complex than previously thought, highlighting the diversity of life during that time period.