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Lawrenceoceras : ウィキペディア英語版 | Lawrenceoceras
''Lawrenceoceras'' is a moderately curved, gently expanding bassleroceratid (Nautiloidia, Ellesmerocerida) from the Lower Ordovician of eastern North America. Septa dividing the chambers are close spaced; sutures straight, transverse; the siphuncle narrow, submarginal. ''Lawrenceoceras'' is closely related to nautiloids such as ''Bassleroceras'' that gave rise to the Tarphycerida although it specifically may not be ancestral. ==References==
* W.M.Furnish & Brian F. Glenister, 1964. Nautiloidea - Ellesmerocerida; Treatise on Invertebrate Paleontology, Part K. Geological Society of America. * (''Lawrenceoceras'' ) in (Fossilworks )
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Lawrenceoceras」の詳細全文を読む
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