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''Burenoceras'' is a genus of small, even tiny, Gasconadian cyrtoconic ellesmeroceratids in which the phragmocone -the chambered portion- is shorter that the living chamber. In general form, ''Burenoceras'' is similar to ''Levisoceras'', but much smaller. Two species, ''B. phragmoceroides'' and ''B. percompressum'' with contracted, slit-like apertures, are miniature forms resembling the much larger homeomorphic Silurian discosorid ''Phragmoceras'' and Devonian oncocerid ''Bolloceras''. Other ''Burenoceras'' have apertures that are variable straight sided or flaring. ''Burenoceras'' is among what are referred to as microellesmeroceroids. ==''references''== *Flower, R.H. 1964. The Nautiloid Order Ellesmerocerida (Cephalopoda); Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro N.M. *W. M. Furnish & Brian F. Glenister, 1964. Nautiloidia -- Ellesmerocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America, Teichert and Moore (eds). 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「Burenoceras」の詳細全文を読む スポンサード リンク
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