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Hemicosmorthoceras : ウィキペディア英語版 | Hemicosmorthoceras
''Geisonocerina'' is an extinct genus of actively mobile carnivorous cephalopod, essentially a ''Nautiloid'', that lived in what would be present day Europe during the Silurian to Devonian from 422.9—412.3 mya, existing for approximately .〔(PaleoBiology Database: ''Hemicosmorthoceras'', basic info )〕 ==Taxonomy== ''Hemicosmorthoceras'' was named by Foerste (1925). It was assigned to ''Orthocerida'' by Teichert et al. (1964); and to Endocerida by Sepkoski (2002).〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕
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