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''Polonoceras'' is a genus included in the goniatitid subfamily Aulatornoceratinae named by Dybczynski, 1913. The type species is ''Polonoceras planum'' Dybczynski. According to Miller, et al. in the American Treatise on Invertebrate Paleontology, 1957, ''Polonoceras'' is a subgenus of ''Tornoceras''. ''Polonoceras'', which lived during the Late Devonian, has an involute or moderately evolute, discoidal shell with a high aperture and flattened, grooved venter. The adventitious lobe, next to the ventral lobe, is widely rounded, the Ventro-lateral saddle narrow and sometimes higher than lateral saddle. ''Polonoceras'' is found in Europe, in Poland, where it was discovered. It is also reported from Upper Devonian (middle Famennian) in Canning Basin, Western Australia. ==References== *''Polonoceras'' in (GONIAT Online ) 6/10/12 *(The Paleobiology Database ''Polonoceras'' entry ) accessed 10 June 2012 * 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「Polonoceras」の詳細全文を読む スポンサード リンク
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