Pachydiscus seppenradensis

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Pachydiscus seppenradensis

fossil cephalopod

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characteristics

In cephalopod: General features and importance to humans
…shell of the fossil ammonite Pachydiscus seppenradensis from the Cretaceous measures 205 centimetres (6 feet 8 inches) in diameter; it is considered to have been the largest shelled mollusk.
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