报告题目：Silurian Bryozoa – twist of fate in the Palaeozoic
报告人：Andrej Ernst
报告人单位：University of Hamburg, Germany
时间：12月9日（周五） 下午16:30
腾讯会议：683-881-669
主办：国家重点实验室、科技处、青促会、人教处
报告简介：
The phylum Bryozoa comprises aquatic colonial animals known from the early Cambrian until today. The main group of bryozoans during Palaeozoic, Palaeostomata, is represented by more than 600 genera, mainly distributed between the early Ordovician and late Triassic. After their fast diversification in the Ordovician, palaeostomates declined strongly in the Hirnantian. Total bryozoan diversity remained low during the Silurian although quite abundant local faunas are known worldwide. In the succeeding Devonian time palaeostomates experienced several waves of diversification which resulted in a significant increase of bryozoan diversity.
The reasons for the depressed bryozoan diversity in the Silurian are not completely understood. Detailed taxonomic analysis shows that during the Silurian some shifts in the composition of bryozoans communities occurred. These changes determined the Devonian diversification of bryozoans. Ecological factors like depressed reef growth could have influenced the bryozoan diversity. Furthermore, sampling bias in the study of Silurian bryozoans appears significant. The majority of bryozoan species in the Silurian reveal small sizes and are apparently often neglected in the field. The ongoing project aims the study of bryozoan faunas in the lower Silurian of South China, in order to search for possible explanations of the sluggish diversification of bryozoans in the Silurian.
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