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Saxoceras : ウィキペディア英語版
Saxoceras

''Saxoceras'' is a very evolute schlotheimiid ammonoid from the Lower Jurassic of Europe and New Caledonia.
The shell of ''Saxoceras'' is discoidal bearing strong, generally straight ribs that arise on the umbilical shoulder and thicken on the middle of the venter. Similar ''Waehneroceras'' has ribs that curve forward as they approach the venter and ''Kammerkarites'' has finer ribs with secondaried. Both are also evolute schlotheimiids with all whorls exposed. ''Epamminites'' of the Arietitidae is similar from the side but has a smooth band running along the venter with a median keel.
==References==

* W.J. Arkell, et al, 1957. Mesozoic Ammonoidea, Treatise on invertebrate Paleontology, Part L, Mollusca 4. 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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