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Lawrenceoceras
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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 )


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