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Cliftonoceras : ウィキペディア英語版 | Cliftonoceras
''Cliftonoceras'' is a barrandeoceroid type tarphycerid from the Uranoceratidae characterized by a smooth gyroconic shell with a rounded dorsum and flattened venter, and by a subvental siphuncle composed of thin connecting rings and necks that are straight ventrally, recumbent dorsally. ''Cliftonoceras'' has been found in Middle Silurian age sediments in Tennessee and Indiana. The type species is ''C. quadratum''. ==References==
*Sweet, Walter C. 1964. Nautiloidea-Barrandeocerida. Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ Kansas Press.
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