胎盤菊石

胎盤菊石學名Placenticeras),又名平盤菊石餅菊石,是生存在晚白堊紀海洋中的一菊石。牠們可能是所有已知的菊石中游速最快的,透過噴水的動力來追逐獵物、逃避兩棲動物魚類的攻擊。[2]化石亞洲歐洲美洲都有發現。[1]

胎盤菊石屬
化石時期:99.7–66.043 Ma
白堊紀晚期
Placenticeras meeki的化石
科學分類 編輯
界: 動物界 Animalia
門: 軟體動物門 Mollusca
綱: 頭足綱 Cephalopoda
目: 菊石目 Ammonitida
科: 胎盤菊石科 Placenticeratidae
屬: 胎盤菊石屬 Placenticeras
Meek英語Fielding Bradford Meek, 1876[1]

見內文

異名
  • Diplacmoceras

特徵

 
Placenticeras whitfieldi的化石,殼上有滄龍的咬痕。

胎盤菊石具有緊壓的、內旋的殼,腹狹窄,有散發光彩的厚實真珠質層。牠們最大可長到50公分長,其巨大的體型和流線型的殼體使牠們在水中能快速游動。[2]

物種[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

參考文獻

  1. ^ 1.0 1.1 1.2 Fossilworks: Placenticeras. [2018-06-01]. (原始內容存檔於2016-03-22) (英語). 
  2. ^ 2.0 2.1 Walker, Cyril英語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

外部連結