| 峡东奥陶纪末期笔石Tangyagraptus的厘定 |
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| 引用本文： | 王传尚,汪啸风.峡东奥陶纪末期笔石Tangyagraptus的厘定[J].地球学报,2004,25(1):47-51. |
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| 作者姓名： | 王传尚 汪啸风 |
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| 作者单位： | 中国地质调查局地层古生物研究中心，湖北宜昌，443003;中国地质调查局地层古生物研究中心，湖北宜昌，443003 |
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| 基金项目： | 国地质调查局“中国古大陆环境变化及年代、生物、层序、事件、化学和构造地层响应”项目(编号2000113900072) |
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| 摘 要： | 本文通过对峡东奥陶系五峰组笔石了Tangyagraptus的系统采集和研究，认为该属以厘定为3个种为宜：Tangyagraptus typicus，T．gracilis和T．remotus，这三个种之间差别明显，前两者个体较小，但T．gracilis笔石枝较细，且宽度均匀，易与T．typicus区别，T．remotus一般个体较大，因第一个次生枝的着生位置远离胎管而得名。该属各种之间在海水中有不同的深度分带，并因此而降低相互之间的生存竞争。
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| 关 键 词： | Tangyagraptus 笔石 厘定 深度分带 |
A Revision of Late Ordovician Tangyagraptus (graptolite)in Eastern Yangtze Gorges Area |
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| WANG Chuan-shang and WANG Xiao-feng.A Revision of Late Ordovician Tangyagraptus (graptolite)in Eastern Yangtze Gorges Area[J].Acta Geoscientia Sinica,2004,25(1):47-51. |
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| Authors: | WANG Chuan-shang and WANG Xiao-feng |
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| Institution: | Center for Stratigraphy and Palaeotology, China Geological Survey, Yichang, Hubei, 443003;Center for Stratigraphy and Palaeotology, China Geological Survey, Yichang, Hubei, 443003 |
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| Abstract: | On the basis of a systematic collection and study of Late Ordovician Tangyagraptus (graptolite) in eastern Yangtze Gorges area, the genus Tangyagraptus is reclassified into 3 species, i.e., Tangyagraptus typicus , T. gracilis and T. remotus . The rhabdosomes of the first two species are relatively small in size, and the slender and uniform stripes of T. gracilis make it easy to distinguish these two species. The rhabdosomes of T. remotus are relatively large in size and the secondary stripes from the primary stripes are always beyond the 8 th thecae-far away from the sicula. These three species occupy different depths in the water column (depth zonation) in the ocean, thus alleviating the competition between each other. |
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| Keywords: | Tangyagraptus graptolite revision depth zonation |
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