Saccorhytus coronarius was an ellipsoid shaped bag, with a big mouth, and was only about a millimeter long. It was also humans' earliest ancestor.
Archaeologists discover a fossil 300 million years older than the dinosaurs!
Scientists link mysterious ice-cream cone shaped fossils to Hallucigenia, a spiny, soft-bodied creature from 500 million years ago.
Picture this: it's the Cambrian period. There are all sorts of strange looking creatures swimming and crawling around the ocean floor...