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Female Paper Nautilus in Salp 5-19-22-6872.jpg

Female Paper Nautilus in Salp, Philippines, First of all, the 'paper nautilus' isn't actually a nautilus. Also known as argonauts, argaunauta hians, these creatures derive their name from the paper-thin, spiralled shell that females produce to shield their eggs. argonaut and nautilus shells may look like but are not.