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Ptychagnostus atavus : ウィキペディア英語版 | Ptychagnostus atavus
''Ptychagnostus atavus'' is a species of agnostid trilobite. It belongs to the genus ''Ptychagnostus'' in the family Ptychagnostidae. It was originally described by Swedish paleontologist as ''Agnostus atavus'' in 1880.〔(【引用サイトリンク】title=''Ptychagnostus atavus'' )〕 It is used in biostratigraphy as an index fossil. Its first appearance at the GSSP section in the Wheeler Shale of Utah is defined as the beginning of the Drumian Age (around million years ago) of the Cambrian Series 3 (Middle Cambrian). ==References==
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「Ptychagnostus atavus」の詳細全文を読む
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