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Placenticeras meeki : ウィキペディア英語版 | Placenticeras meeki
''Placenticeras meeki'' is an ammonite species from the Late Cretaceous. These cephalopods were fast-moving nektonic carnivores. They mainly lived in the American Interior Basin (Western Interior Seaway). ==Description== Shells of this species could reach a diameter of about . They are discoidal, involute and compressed. Whorls are stout and rounded to diameter of 3 millimeters. The surface of fossils is usually covered by opalized nacre (ammolite).
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「Placenticeras meeki」の詳細全文を読む
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