Classification and Evolutionary Trends of Middle Ordovician to Silurian Rugosa from the Yangtze Region
详细信息
- 责任者：He Xinyi (China University of Geosciences ; Beijing 100083 ; China) ; Tang Lan
- 刊名：Acta Palaeontologica Sinica
- 出版年：2013
- 卷期：52(1)
- 关键词：四射珊瑚目 ; Tetracorallia ; 扬子地区 ; Yangtze Region
- 页码：p.35-50
- 图表：illus., 3 tables, 57 refs.
- 分类号：1102
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
Middle Ordovician to Early and Late Silurian rugose corals are well developed in the Yangtze region , especially in the Middle-Late Ashgillian and the Aeronian to Telychian of the Llandovery.According to the most up to date records there are 124 genera in total , comprising 31genera from the Landeilo to Middle-Late Ashgillian , 87from the Silurian Llandovery , and six from the Late Silurian.However , the characteristics of some genera previously have not been well defined and their taxonomic relationships were uncertain.After reviewing the published data and our own collections , a classification of rugose corals from the Middle-Late Ordovician and Silurian in the Yangtze Region is proposed and discussed.We suggest that 46out of a total of 124 genera , belonging to 7 families , may be included in the Streptelasmatida ; 37 genera in 14 families may be referred to Columnariida ; and 41 genera in 9 families may be placed in Cystiphyllida.Evolutionary trends amongst some families and genera of Rugosa from the Yangtze Region are also proposed and discussed , within an evolutionary systematics framework.
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