Half-a-billion-year-old slug reveals mollusc origins BBC.comHalf-a-billion-year-old new species reveals the origins of the octopus The IndependentPrimordial spiny slug from China was forerunner of world’s mollusks ReutersIs that a durian? No, it’s a weird ancient mollusc Nature.comResearchers uncover 500 million-year-old mollusk ancestor Phys.org