Latest Helcionelloid Molluscs from the Lower
普通话考试入口
Ordovician of Kazakhstan
"电商物流"期刊名称： Palaeontology
作者： Alexander P. Gubanov,John S. Peel
年份： 2003年
白云源
期号： 第4期静字的图片
关键词： helcionelloid molluscs;late Cambrian;Early Ordovician;Kazakhstan零的英文>改革开放四十周年
摘要：The helcionelloid mollusc Chuiliella elenae gen. et sp. nov. is described from the Lower Ordovician of Kazakhstan. It reprents the geologically youngest record of a group of mainly bilaterally symmetrical ancient molluscs which originated in the earliest Cambrian, flourished during the earlymid Cambrian and was thought to have become extinct during the late Cambrian. Chuiliella is a ty
蜻蜓的资料
那一刻我的世界春暖花开作文pical helcionelloid in terms of shell shape, although the comarginal ornamentation characteristic of many helcionelloids is lacking. Interpretation of the raid margin of the aperture adjacent to the earlier coiled whorl as exhalant channels favours reconstruction of helcionelloids as endogastrically coiled, i.e., with the apex posterior.
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