粗碟菊石

粗碟菊石（學名：），又名厚盤菊石、厚圓盤菊石，是生存於晚白堊紀的一屬菊石，生活在開闊的海域中，游水能力很強。本屬下包括有菊石界中的巨物，殼長達2公尺。國際地層委員會將本屬下Pachydiscus neubergicus化石的訂為白堊紀-{馬斯垂克期}-開始的標誌。

特徵 
粗碟菊石的外殼均勻內旋且壓縮，並有短小微彎的肋條。腹是圓形的。

物種 
Joaquinites fascicostatum 
Pachydiscus (Neodesmoceras) 
Pachydiscus (Pachydiscus) 
Pachydiscus (Parapachydiscus) gardneri 
Pachydiscus (Parapachydiscus) woodringi 
Pachydiscus ashlandicus 
Pachydiscus averilli 
Pachydiscus epiplectus 
Pachydiscus excelsus 
Pachydiscus flexuosus 
Pachydiscus gollevillensis 
Pachydiscus hauthali 
Pachydiscus naumanni 
Pachydiscus neubergicus 
Pachydiscus oregonensis 
Pachydiscus patagonicus 
Pachydiscus riccardi 
Pachydiscus stallauensis 
Pachydiscus steinmanni 
Parapachydiscus albuquerquei 
Parapachydiscus arionis 
Parapachydiscus athena 
Parapachydiscus bidwelli 
Parapachydiscus brasiliensis 
Parapachydiscus bruneti 
Parapachydiscus catarinae 
Parapachydiscus coalingensis 
Parapachydiscus cortinaensis 
Parapachydiscus endymion 
Parapachydiscus eurydice 
Parapachydiscus euzebioi 
Parapachydiscus gettyi 
Parapachydiscus hera 
Parapachydiscus hermes 
Parapachydiscus oceanus 
Parapachydiscus orpheus 
Parapachydiscus panochensis 
Parapachydiscus parahybensis 
Parapachydiscus peninsularis 
Parapachydiscus perseus 
Parapachydiscus poseidon 
Parapachydiscus psyche 
Parapachydiscus reedsi 
Parapachydiscus stanislausensis 
Parapachydiscus sumneri 
Parapachydiscus williamsoni

參考文獻

外部連結 
 Pachydiscus   in the

延伸閱讀 
 , Part L, Ammonoidea. R.C. Moore, ed. Geological Soc. of America and Univ. Kansas press. p L377-L380.
 A Pictorial Guide to Fossils by Gerard Ramon Case
 Cephalopods Present and Past: New Insights and Fresh Perspectives by Neil H. Landman, Richard Arnold Davis, and Royal H. Mapes
 Kennedy, W. J. (1986). Campanian and Maastrichtian Ammonites from Northern Aquitaine, France (No. 36). Palaeontological association. page 30

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