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Manitoulinoceras : ウィキペディア英語版
Manitoulinoceras

''Manitoulinoceras'' is a Late Ordovician oncocerid nautilod cephalopod, found in North America (Kentucky, Ohio, Indiana, and Ontario). The shell is cyrtoconic, exogastric, more strongly curved than in ''Kindleoceras''. The cross section is somewhat wider than high, with a somewhat flattened upper side, known as the dorsum. Actinosiphonate deposits in the siphuncle are confined to early part of phragmocone.
''Staufferoceras'', a valcuouroceratid from the Middle and Upper Ordovician of Minnesota and Ohio named by Foeste, 1932, is much like ''Manitoulinoceras'' but with a living chamber that is swollen in the middle, narrowing toward the aperture.
==References==

*Walter C Sweet, 1964 Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology Part K Mollusca 3. Geological Society of America and University of Kansas Press.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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