摘要
扬子区中奥陶世至早、晚志留世产有丰富的四射珊瑚,尤其Ashgill期中、晚期和Llandovery世的Aero-nian—Telychian期产出珊瑚最盛。据已报道统计,该地区共有四射珊瑚124属,包括中、晚奥陶世31属,早志留世(Llandovery世)87属,晚志留世6属。其中有一些属的分类位置以及属征各家仍存在分歧。对扬子区中、晚奥陶世和志留纪四射珊瑚群已发表和笔者手中尚存资料进行系统整理之后,提出该区奥陶纪、志留纪四射珊瑚的分类意见并加以讨论,共分3个目:即扭心珊瑚目(Streptelasmatida),柱珊瑚目(Columnariida)和泡沫珊瑚目(Cystiphyllida)。其中扭心珊瑚目含有46属,分属7个科,柱珊瑚目包含37属,分属14个科,而泡沫珊瑚目包含41属,分属9个科。此外,文中提出扬子区中、晚奥陶世和早志留世四射珊瑚某些科、属的演化趋向并加以适当讨论。
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 31 genera from the Landeilo to Middle-Late Ashgillian, 87 from 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 re- viewing the published data and our own collec- tions, a classification of rugose corals from the Middle-Late Ordovician and Silurian in the Yangtze Region is proposed and discussed. We suggest that 46 out 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.
出处
《古生物学报》
CAS
CSCD
北大核心
2013年第1期35-50,共16页
Acta Palaeontologica Sinica
基金
IGCP591项目"早
中古生代重大事件"的阶段成果
关键词
四射珊瑚
分类
演化中
晚奥陶世
志留纪
扬子区
Rugose corals, Middle-Late Ordovician, Silurian, classification, evolutionary systematics, Yangtzeregion
