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Cochlioceras : ウィキペディア英語版 | Cochlioceras
''Cochlioceras'' is an extinct baltoceratid genus from the lower and middle Ordovician (Arenig - Llanvrin) of what are now Europe, the U.S (Vermont), and China, having existed for approximately 14 million years, from about 478 to 464 mya. 〔Teichert et al 1964, Treatise on Invertebrate Paleontology Part K; Nautiloidea - Ellesmerocerida by W.M. Furnish and Brian F. Glenister, pp K129 -K160.〕 ==Taxonomy== ''Cochlioceras'' was named by Eichwald (1860). Its type is ''Cochlioceras avus''. It was assigned to the Baltoceratidae by Furtnish and Glensiter in Teichert et al. (1964) 〔 and removed, with the Baltoceratidae, from the Ellesmerocerida to the Orthocerida by Kroger et al. (2007)
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