Paleontologists unearthed a 500-million-year-old fossilized predator, Mosura fentoni, nicknamed the "sea moth," in Canada's Burgess Shale. This three-eyed creature, about the length of an index finger, possessed a circular, toothed mouth and claws. Unlike other radiodonts, Mosura had a 16-segmented body with gills, showcasing unexpected complexity. Its well-preserved fossil reveals an open circulatory system. The discovery sheds light on the diversity of life preceding the Cambrian explosion, suggesting even earlier, more complex creatures than previously thought.

Prepared by Olivia Bennett and reviewed by editorial team.