環角石(學名:Cycloceras)是一屬已滅絕的鸚鵡螺類。牠們生活在奧陶紀至二疊紀的海洋中。[1]
分類學
環角石屬是由McCoy於1844年所命名。1962年時Flower將其分入米契林角石目,1964年時Sweet in Teichert et al.則將其分入直角石目。[3]環角石屬可能是Cycloceratidae下的一員且可能是Perigrammoceras屬的異名。
物種[1]
- Cycloceras hsiangtanense Zhao, 1954
- Cycloceras laevigatum M'Coy, 1844
參考文獻
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