| The Bivalve Yangtzedonta is not the Brachiopod Xianfengella |
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| 作者姓名： | YU Wen Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing Jiangsu China |
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| 作者单位： | Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing,Jiangsu 210008, China （Present address： Department of Earth and Planetary Sciences, Western Australian Museum, Francis Street, Perth, Western Australia 6000, Australia） |
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| 摘 要： | Abstract The alleged ＂holotype＂of the bivalve Yangtzedonta primitiva Yu.1985 figured by Qian （2001） is a broken and distorted specimen of the brachiopod Xianfengella prima He and Yang, 1982 and not the holotype of Y. primitiva. Qian contends that the oldest recognized monoplacophoran, Maikhanella pristinis （Jiang, 1980）, is neither a monoplacophoran nor the oldest molluscan fossil in the Meishucunian Stage of China. Furthermore, he considers that the oldest bivalve Xianfengoconcha eUiptica Zhang, 1980 is an inarticulate brachiopod, not a mollusc. WatsoneUa yunnanensis （He and Yang, 1982）, is associated with Yangtzedonta primitiva Yu but indicates no evolutionary relationship between the Classes Rostroconchia and Bivalvia in the Lower Cambrian Zhongyicun Member of the Yuhucun Formation. Qian＇s confusion in using non-molluscan fossils to discuss the early evolution of shelled molluscs also confuses the basic concepts of the respective groups.
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| 关 键 词： | 腕足类动物 动物群 正模 软体动物 进化论 |
| 收稿时间： | 2005-01-21 |
| 修稿时间： | 2005-06-03 |
The Bivalve Yangtzedonta is not the Brachiopod Xianfengella |
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| Authors: | YU Wen Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing Jiangsu China |
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| Abstract: | Abstract The alleged “holotype” of the bivalve Yangtzedonta primitiva Yu, 1985 figured by Qian (2001) is a broken and distorted specimen of the brachiopod Xianfengella prima He and Yang, 1982 and not the holotype of Y. primitiva. Qian contends that the oldest recognized monoplacophoran, Maikhanella pristinis (Jiang, 1980), is neither a monoplacophoran nor the oldest molluscan fossil in the Meishucunian Stage of China. Furthermore, he considers that the oldest bivalve Xianfengoconcha elliptica Zhang, 1980 is an inarticulate brachiopod, not a mollusc. Watsonella yunnanensis (He and Yang, 1982), is associated with Yangtzedonta primitiva Yu but indicates no evolutionary relationship between the Classes Rostroconchia and Bivalvia in the Lower Cambrian Zhongyicun Member of the Yuhucun Formation. Qian's confusion in using non‐molluscan fossils to discuss the early evolution of shelled molluscs also confuses the basic concepts of the respective groups. |
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| Keywords: | Yangtzedonta Bivalvia Xianfengella Xianfengoconcha inarticulate brachiopods Yangtze micromolluscan fauna |
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