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Paraphyletic groups
Early Ordovician first appearances
Mesozoic cephalopods
Paleozoic cephalopods
Prehistoric cephalopod orders
Orthocerida
Triassic extinctions

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Orthocerida

Septum (cephalopod)

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Lituites

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Nautiloid

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Siphuncle

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Cephalopod

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