“Half-a-billion-year-old spiny slug reveals octopus origins”
Researchers have discovered a new species of mollusc that lived 500 million years ago. The fossil, called Shishania aculeata, is a flat, shell-less slug covered in a protective spiny armour. Some fossils were found preserved upside down, showing that the animal’s bottom was naked, with a muscular foot like a slug. Experts suggest that this … Read more