胎盘菊石

胎盘菊石学名Placenticeras),又名平盘菊石饼菊石,是生存在晚白垩纪海洋中的一菊石。它们可能是所有已知的菊石中游速最快的,透过喷水的动力来追逐猎物、逃避两栖动物鱼类的攻击。[2]化石亚洲欧洲美洲都有发现。[1]

胎盘菊石属
化石时期:99.7–66.043 Ma
白垩纪晚期
Placenticeras meeki的化石
科学分类 编辑
界: 动物界 Animalia
门: 软体动物门 Mollusca
纲: 头足纲 Cephalopoda
目: 菊石目 Ammonitida
科: 胎盘菊石科 Placenticeratidae
属: 胎盘菊石属 Placenticeras
Meek英语Fielding Bradford Meek, 1876[1]

见内文

异名
  • Diplacmoceras

特征

 
Placenticeras whitfieldi的化石,壳上有沧龙的咬痕。

胎盘菊石具有紧压的、内旋的壳,腹狭窄,有散发光彩的厚实真珠质层。它们最大可长到50公分长,其巨大的体型和流线型的壳体使它们在水中能快速游动。[2]

物种[1]

  • Placenticeras bidorsatum
  • Placenticeras cumminsi
  • Placenticeras fritschi
  • Placenticeras grossouvrei
  • Placenticeras kolbajense
  • Placenticeras maherndli
  • Placenticeras mediasiaticum
  • Placenticeras memoriaschloenbachi
  • Placenticeras orbignyanum
  • Placenticeras paraplanum
  • Placenticeras placenta
  • Placenticeras polyopsis
  • Placenticeras pseudoplacenta
  • Placenticeras semiornatum
  • Placenticeras syrtale
  • Placenticeras tamulicum
  • Placenticeras vredenburgi
  • Placenticeras whitfieldi

参考文献

  1. ^ 1.0 1.1 1.2 Fossilworks: Placenticeras. [2018-06-01]. (原始内容存档于2016-03-22) (英语). 
  2. ^ 2.0 2.1 Walker, Cyril英语Cyril Walker (palaeontologist); Ward, David. Fossils. Smithsonian Handbooks revised, illustrated. Dorling Kindersley. 2002: 149. ISBN 0789489848. 
  • Arkell et al., 1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Soc. of America, Univ of Kansas Press. R.C. Moore, (Ed)
  • W. A. Cobban and Hook, S. C. 1983 Mid-Cretaceous (Turonian) ammonite fauna from Fence Lake area of west-central New Mexico. Memoir 41, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
  • W. A. Cobban and Hook, S. C. 1979, Collignoniceras woollgari wooollgari (Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States. Memoir 37, New Mexico Bureau of Mines&Mineral Resources, Socorro NM.
  • Discovering Fossils: How to Find and Identify Remains of the Prehistoric Past (Fossils & Dinosaurs) by Frank A. Garcia, Donald S. Miller, and Jasper Burns

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