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Augustoceras : ウィキペディア英語版 | Augustoceras
''Augustoceras'' is a nautiloid cephalopod genus included in the order Oncocerida and family Valcouroceratidae. It is known form the Middle and Upper Ordovician of Kentucky and Ohio in the US. Shells of ''Augustocers'' are slender, supwardly cureved, fusiform, exogastric cyrtocones with subtriangular cross-sections, short chambers, oblique sutures, and subventral siphuncles with simple internal radial actinosiphonate deposits. ''Kindleoceras'' from the Upper Ordovician of Ontario differs in having a more triangular cross-section and more numerous actinosiphonate rays in its siphuncle. ==''References''==
*Walter C Sweet, 1964 Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology Part K Mollusca 3. Geological Society of America and University of Kansas Press
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