THE EARLIEST SILURIAN CATHAYSIORTHIS FAUNA (BRACHIOPODS) OF E CHINA AND ITS EVOLUTIONARY SIGNIFICANCE
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Abstract:
Since a preliminary investigation carried out by Rong and Zhan(2006),more material of the brachiopods have been collected from the basal part of the Shiyang and Anji formations at various localities in northeastern Jiangxi and western and northern Zhejiang provinces during the past five years.These brachiopods are of earliest Rhuddanian in age(Akidograptus ascensus Biozone).Twenty three species of 23 genera belonging to 20 families of the brachiopods are identified,including Paracraniops,Deliella,Katastrophomena,Leptaena,Tashanomena,Eopholidostrophia,Eoplectodonta,Leangella,Skenidioides,Hesperorthis,Glyptorthis,Cathaysiorthis gen.nov.,Dalmanella,Levenea,Epitomyonia,Coolinia,Triplesia,Brevilamnulella,Thebesia,?Alispira,Eospirigerina,Hyattidina and Eospirifer,in addition to Yushanomena which was described by Zeng and Hu(1997)from this assemblage is considered to be a junior subjective synonym of Tashanomena Rong and Zhan,1994.However,we have not found Tashanomena in the new collections.
