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

''Anapachydiscus'' is an extinct cephalopod genus from the Upper Cretaceous, Coniacian - Maastrichtian of Europe, Africa, Madagascar, S.India, N Z, Calif. Mexico, Argentina, and the Antarctic belonging to the ammonoid family Pachydiscidae.
''Anapachydiscus'' has a rather involute shell with a broad to moderately compressed whorl section. Early whorls smooth, intermediary develop straight or slightly curved, radial ribs that thicken toward the umbilicus. Outer whorls may again be smooth, or have coarse ribs so as to resemble ''Eupachydiscus''.
==References==

*Treatise on invertebrate Paleontology, Part L, Mollusca 4. Mesozoic Ammonoidea. Geological Society of America and Univ. Kansas Press (1957)
*(''Anapachydiscus''-Paleodb ) 5/02/11

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「Anapachydiscus」の詳細全文を読む



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