Scientists have found evidence that a 300-million-year-old sea creature previously thought to be the world’s oldest octopus is actually a nautilus relative. University of Reading zoology lecturer Thomas Clements led the research, which found that the fossil, originally identified in 2000, had too many teeth to be an octopus. The creature was found in Illinois and had puzzled scientists for years, because it is much older than the next-earliest known octopus The findings, published this week, mean Guinness World Records will no longer list the specimen it as the earliest known octopus.