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Paradnatoceras : ウィキペディア英語版 | Paradnatoceras
''Paradnatoceras'' is an extinct straight-shelled cephalopod genus that lived in what would become China during the Ordovician from 478.6 to about 461 mya, existing for approximately 17.6 Ma.〔(PaleoBiology Database: ''Paradnatoceras'', basic info )〕 ==Taxonomy== ''Paradnatoceras'' is included in the Orthocerida according to Sepkoski (2002).〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕 Inclusion of the Orthocerida in the subclass Orthoceratoidea is according to more recent taxonomic opinion.〔Björn Kröger. A new genus of middle Tremadocian orthoceratoids and the Early Ordovician origin of orthoceratoid cephalopods. ''Acta Palaeontologica Polonica'' 53 (4): 745–749, 2008 ()〕 In older taxonomies,e.g.,〔Treatise on Invertebrate Paleontology, Part K, 1964; Teichert and Moore (eds)〕 the Orthocerida were included in the Nautiloidea.
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