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''Acanthinites'' is an extinct cephalopod genus belonging to the ammonoid order Ceratitida described by Mojsisovics in 1893 who established the type species of the group as ''Acanthinites excelsus''. The Shell is involute, compressed; sides arched, converging on narrow venter with a central furrow bordered by low serrated keels. Flanks are covered by numerous spiral rows of tubercles. ''Acanthinites'' has been found in the Alps, Himalayas, and Timor, and in the case of ''A. magnificus'' British Columbia in western Canada. Its fossils are found in the Norian stage of the Triassic Period, which lasted from about 216.5 to 203.6 million years ago. ''Acanthinites'' was previously included in the Certopleuitidae of the Clydonitaceae but now in the closely related Tibetitidae with certopleutids reduced to an included subfamily. Related genera include ''Cyrtopleurites'', and ''Himavites''. ==References== * W.J. Arkell, et al, 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L, Ammonoidea. University of Kansas Press. *( Acantnites ) in Fossilworks 1/4/15. 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「Acanthinites」の詳細全文を読む スポンサード リンク
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