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Cumingsoceras : ウィキペディア英語版 | Cumingsoceras ''Cummingsoceras'' is a barrandeoceroid genus within the Tarphycerida, included in the family Uranoceratidae. Its shell is a rapidly expanding gyrocone of about 1.5 narrowly separated whorls. The surface is faintly cancellated by slight longitudinal lines that cross growth lines which define a deep hyponmic sinus. The siphuncle is small, subcentral, and with recumbent necks. ''Cummingsoceras'' is known from the middle Silurian of Indiana and Illinois. ==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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