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Keywords from Image Description:
Rayonnoceras section. en reproduction of polished section of Rayonnoceras specimen Nautiloidea Actinocerida internal siphuncle space annulosiphonate deposits connective rings perispatium septa with cyrtocoanitic septal necks endocameral deposits Own Antonov Rayonnoceras Illustrations of Cephalopoda fossils Cephalopoda anatomy