The permafrost formation, called Yedoma, kept the rotifer frozen solid at around -20 degrees C for the entire period.

500 million years ago, the world was a very different place. Basically all life lived in the water, which held a lot of animals that looked pretty different from the ones we recognize today. One of ...

But a UC Riverside-led team has now identified the oldest known ecdysozoan in the fossil record and the only one from the Precambrian period. Their discovery of Uncus dzaugisi, a worm-like creature ...