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Paper Nautilus are a type of octopus found in temperate and tropical waters world wide. Only the female has a shell which serves as a brood chamber and a flotation device. This shell is secreted by the greatly extended web of one pair of arms. Young females kept in aquaria have been found to start building a shell twelve days after hatching. It is a general thought that they carry their shells throughout their lives, adding to the outer edge as they grow
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