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''Arctohungarites'' is a Triassic ammonoid now placed in the ceratitid family Danubitidae, but previously included in the Hungeritidae. The shell of ''Arctohungerites'' is subdiscoidal, involute, with a rounded venter, weak sigmoidal folds on the body chamber and a distinct ventral keel on the distal end of the chambered portion. The suture is ceratitic. ''Arctohungerites'' was found in Middle Triassic (Anisian) sediments in northern Siberia ==''References''== * Arkell ''et al''. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geol Soc of America and Univ Kansas press. R. C. Moore (Ed) *( Classification of E. T. Tozer 1981 ) 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「Arctohungarites」の詳細全文を読む スポンサード リンク
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