Paleontologists have discovered a new 506-million-year-old species, *Mosura fentoni*, from Canada's Burgess Shale. This index-finger-sized radiodont predator possessed three eyes, spiny claws, and a unique multi-segmented abdomen unlike other known radiodonts. Its unusual abdomen may indicate unique respiratory needs or habitat preferences. The well-preserved fossils, including details of internal organs, offer significant insights into early arthropod evolution and circulatory systems. The discovery highlights the biodiversity of early arthropods and the ongoing value of museum collections.

Prepared by Olivia Bennett and reviewed by editorial team.