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:''For the plant genus Clymenia, see Clymenia (plant)'' | taxon = Clymenia | authority = Swingle, 1939 | subdivision_ranks = Species |subdivision_ranks = Species |subdivision = * ''C. laevigata'' * ''C. sedgwickii'' }} ''Clymenia'' is a genus in the ammonoid order Clymeniida, restricted to the Upper Devonian, characterized as with all clymeniids by a dorsal siphuncle that runs along the inside of the whorls, unusual for ammonoids. ''Clymenia'' has a closely coiled evolute shell that may be faintly ribbed. The dorsum, on the inside of the whorl, is slightly impressed, a result of the outermost whorl slightly enveloping the previous. The venter may be rounded or acute. The suture is simple, with a broad ventral saddle, broad lateral lobe, a dorso-lateral saddle, and a moderately deep hidden dorsal lobe. Septal necks are usually short and do not form a continuous tube. The suture and siphuncle are characteristic of the family. ''Clymenia'' is included in the family Clymeniidae. Is fossils have been found in Europe and Western Australia. ==References== ;Notes ;Bibliography * ''Rocks, Minerals & Fossils of the World'' by Chris Pellant and Roger Phillips * ''Treatise on Invertebrate Paleontology, Part L Ammonoidea''; Geological Society of America and Univ of Kansas Press, 1964 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「Clymenia (ammonite)」の詳細全文を読む スポンサード リンク
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