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Geisonocerina : ウィキペディア英語版 | Geisonocerina
''Geisonocerina'' is an extinct genus from the carnivorous nautiloid cephalopod order Orthocerida that lived in what would be North America, Europe, and Asia during the Ordovician through Permian from 449—290 mya, existing for approximately . ==Taxonomy== ''Geisonocerina'' was named by Foeste (1935) and included in the Geisonoceratidae as part of the Orthocerida 〔 Sweet 1964. Nautiloidea-Orthocerida, Treatise on Invertebrate Paleontology Part K, Teichert and Moore (eds), Geological Society of America and University of Kansas press. 〕 where it is listed in Sepkoski (2002). 〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕
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