Ordovician Bryozoan Diversity Changes and Bearing on the Origin of Bryozoa
详细信息
- 责任者：Xia Fengsheng (State Key Laboratory of Palaeobiology and Stratigraphy ; Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Ma Junye
- 刊名：Acta Palaeontologica Sinica
- 出版年：2010
- 卷期：49(2)
- 关键词：苔藓动物门 ; Bryozoa
- 页码：p.139-163
- 图表：8 illus., 2 tables, 156 refs.
- 分类号：1101
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
The Ordovician Period has great significance for the origination, radiation and extinction of bryozoans, and also for formation of bryoherms. The oldest known bryozoans are found in the strata of Fenhsiang Formation of China, and nearly all recognized orders of bryozoans appeared successively throughout the Ordovician. Within bryozoans, Trepostomida and Cryptostomida first appeared in Tr2 of the Tremadocian, and maintained relatively low diversity in the Floan and Dapingian. Their diversity increased beginning in the Darriwilian, and a major radiation occurred from the Sandbian through the Katian.