The 500-million-year-old spiky slug which tells us more about the origins of oysters and octopuses
![The 500-million-year-old spiky slug which tells us more about the origins of oysters and octopuses](https://e3.365dm.com/24/08/1920x1080/skynews-spiny-slug_6644794.jpg?20240801141708)
The discovery of a half-a-billion-year-old slug with spines has shed light on the origins of animals like oysters and octopuses, researchers have said.