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Rayonnoceras
Rayonnoceras is a genus of extinct cephalopod of the order Actinoceratida and that lived around 325 million years ago, during Ordovician to Carboniferous times. They were among the last of the Actinoceratida, which were highly specialized nautiloids characterized by possessing a long straight, sometimes large and nearly cylindrical shell, which, like the endoceroids, contains an unusually large and heavy siphuncle.
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