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''Eupachydisus'' is a large, coarse-ribbed Pachydiscid ammonite genus from the Upper Cretaceous, found in Coniacian to Campanian age strata in Europe, Madagascar, Japan, and British Columbia. The whorl section in ''Eupachydiscus'' is inflated and depressed, almost round in the later growth stages. Ribs are narrow but prominent in the early whorls, becoming thick and strong in the later. ''Eupachydiscus'' is distinct from the mostly later, Campanian - Maastrichtian, compressed and high-whorled ''Pachydiscus'', but somewhat similar to the coeval, inflated and coarse ribbed, Coniacian-Santonian, ''Pachydiscoides'' ==Species== * ''Eupachydiscus isculensis'' † Redtenbacher 1873 * ''Eupachydiscus macoveii'' † Szaisz 1981 * ''Eupachydiscus pseudogrossouvrei'' † Collignon 1955 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「Eupachydiscus」の詳細全文を読む スポンサード リンク
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