For over two decades, the 300-million-year-old fossil Pohlsepia mazonensis was celebrated as the world’s oldest octopus ancestor due to its soft, sack-like appearance, but after 20 years of study, it ...

For years, this fossil seemed to tell a thrilling story. Here was an animal from more than 300 million years ago that appeared to look like an octopus, complete with what were described as arms, fins ...

More than two decades after scientists identified a fossil as the world’s oldest octopus — officials now say it wasn’t one at all. A recent study published in the journal Proceedings of the Royal ...