Interpretive drawings of Paleocanna tentaculum as living organisms: depiction of individual polyps living in single tubes, as well as clusters of two or three tubes attached together. Credit: Louis-Philippe Bateman / McGill University

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Jellyfish are delicate, almost ghostly creatures. But under just the right circumstances, these spectral invertebrates can still tell stories long after their death. Not far from Quebec City, Canada marine paleontologists have discovered a new species of invertebrate that swayed in Paleozoic ocean currents over 450 million years ago.…