鬆卷角石

鬆卷角石學名:)是一滅絕鸚鵡螺類。牠們生活在晚奧陶紀海洋中。其化石分布於北美中國[1]

鬆卷角石屬
化石时期:晚奧陶紀
PreЄ
Aphetoceras americanus的化石
藝術家筆下的復原圖:一隻房角石正在捕食鬆卷角石,一旁有些許Cyclostomiceras動物游著
科学分类
界: 动物界 Animalia
门: 軟體動物門 Mollusca
纲: 頭足綱 Cephalopoda
目: 触环角石目 Tarphycerida
科: 爱沙尼亚角石科 Estonioceratidae
属: 鬆卷角石屬 Aphetoceras
Hyatt, 1894
模式种
Aphetoceras americanum
Hyatt, 1894

見內文

特徵

鬆卷角石擁有捲曲的外殼,盤捲得很鬆,因而得名。其螺層間並不相連。

牠們在概述上與愛沙尼亞角石Alaskoceras相近,但其截面與Clytoceras最為相似。

物種[1]

  • Aphetoceras americanum
  • Aphetoceras attenuatum
  • Aphetoceras boreale
  • Aphetoceras evolutum
  • Aphetoceras farnsworthi
  • Aphetoceras oderi
  • Aphetoceras ruedemanni
  • Aphetoceras subcostulatum

參考文獻

  1. . [2018-05-30] (英语).
  • Aphetoceras, p K358 in Vol K of the Treatise on Invertebrate Paleontology in the section on the Estonioceratidae, p K357-K359, included in the Chapter on the Tarphycerida by Furnish and Glenister starting with page K343.
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