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Cyrtobaltoceras : ウィキペディア英語版 | Cyrtobaltoceras
''Cyrtobaltoceras'' is an extinct cephalopod genus known from the upper Lower Ordovician Fort Cassin Formation at Valcour, N.Y. that is included in the Nautiloid family Baltoceratidae ==Taxonomy== ''Cyrtobaltoceras'' was named by Flower (1964 〔Flower 1964; The Nautiloid Order Ellesmerocerida (Cephalopoda; Memour 12, New Mexico Bureau of Mines and MIneral Resources〕 who then assigned it to the Baltoceratidae which at that time was included in the Ellesmerocerida. The Baltoceratidae, along with included genera, has since been moved to the Orthocerida.〔Kroger et al 2007; Early orthoceratoid cephalopods from the Argentine Precordillera, Journal of Paleontology Nov 2007; v. 81; no. 6; p. 1266-1283;〕
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