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Pseudorthocerataceae : ウィキペディア英語版 | Pseudorthocerataceae
''Pseudorthocerataceae'' is an extinct genus of actively mobile carnivorous cephalopod, essentially a ''Nautiloid'', that lived in what would be North America, Europe, Australia, and Asia during the Ordovician from 490—445.6 mya, existing for approximately .〔(PaleoBiology Database: ''Pseudorthocerataceae'', basic info )〕 ==Taxonomy== ''Pseudorthocerataceae'' was named by Sweet (1964). It was assigned to ''Pseudorthocerida'' by Barskov (1968); and to ''Orthocerida'' by Sweet (1964), Evans (1994) and Evans (1994).〔W. C. Sweet. 1964. Nautiloidea–Orthocerida. In C. Teichert et al. (ed.), Treatise on Invertebrate Paleontology (K) Mollusca 3 216-261〕〔D. H. Evans. 1994. The Cephalopod Fauna of the Bardahessaigh Formation (Caradoc Series) of Pomeroy, County Tyrone. Irish Journal of Earth Sciences 13:11-29 〕
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