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Protobactrites : ウィキペディア英語版 | Protobactrites
''Protobactrites'' is an extinct nautiloid cephalopod belonging to the Orthoceratoidea that lived in what would be Europe and Asia during the Ordovician and Silurian from 466–421.3 mya, existing for approximately .〔(PaleoBiology Database: ''Protobactrites'', basic info )〕 ==Taxonomy== ''Protobactrites'', named by Hyatt in Zittel (1900), is an orthocerid of unknown familial affiliation〔Sweet, Walter C. 1964. Nautiloidea- Orthocerida; Treatise on Invertebrate Paleontology K(3); R.C. Moore (ed)〕 where it was retained by Sepkoski (2002).〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕 In spite of the name, ''Protobactrites'' has no known relationship to the Bactritida
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