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Barroisiceras : ウィキペディア英語版 | Barroisiceras
''Barroisiceras'' is an acanthoceratacean ammonite from the Upper Cretaceous, Coniacian, included in the family Collignoniceratidae. ==Diagnosis== The shell of ''Barroisiceras'' is rather involute, coiled such that the outer whorl embraces much of the previous, and is generally compressed. Whorls are high with a strong crenulate keel and sparse umbilical tubercles that develop into pairs of commonly flat ribs.
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「Barroisiceras」の詳細全文を読む
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