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Plectronoceratidae : ウィキペディア英語版 | Plectronocerida
Plectronocerida is a primitive order from which subsequent cephalopod orders are ultimately derived.〔Curt Teichert, 1988. Main Features of Cephalopod Evolution. The Mollusca Vol. 12 Paleontology and Neontology of Cephalopds; Academic Pres Inc.〕 ==Occurrence== Plectronoceratids are known from the Upper Cambrian (upper Franconian – middle Trempealeauan )of China and North America (Minnesota, Wisconsin). Two families are recognized (Flower, 1964),〔Flower, Rousseau H. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda); Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro, New Mexico〕 the generally straight to endogastric Plectronoceratidae and the slightly exogastric Balkoceratidae.
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「Plectronocerida」の詳細全文を読む
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