Geographical Distribution and Diversity History of Late Cambrian and Ordovician Gastropods in China

摘要

1 Introduction Gastropods are one of the most diverse groups in the living animals.The rich,long-ranging and extensive occurrences of gastropod fossils make them a unique animal group for evolutionary,ecologic,and biogeographic studies(Fryda and Rohr,2004).As a major component of shallow-water benthic fauna.