| 滇西澜沧老厂晚二叠世双壳动物群的发现及其生物区系特征 |
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| 引用本文： | 冯庆来,崔新省,刘本培.滇西澜沧老厂晚二叠世双壳动物群的发现及其生物区系特征[J].地球科学,1992(5). |
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| 作者姓名： | 冯庆来 崔新省 刘本培 |
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| 作者单位： | 中国地质大学地质系
(冯庆来，崔新省)，中国地质大学地质系(刘本培) |
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| 摘 要： | 本文描述了采自云南澜沧老厂的双壳类,共计13属、15种和未定种(其中1新属、4新种)。该动物群地质时代为晚二叠世,其组成既有鲜明的地方特色,又与扬子地区有明显联系,属扬子生物区系,并具亚热带生物特征。
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| 关 键 词： | 晚二叠世 双壳类 生物区系 澜沧地区 |
DISCOVERY OF LATE PERMIAN BIVALVE-FAUNA FROM LAOCHANG OF LANCANG, WEST YUNNAN AND ITS BIOGEOGRAPHIC CHARACTERISTICS |
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| Feng Qinglai Cui Xinsheng Liu Benpei.DISCOVERY OF LATE PERMIAN BIVALVE-FAUNA FROM LAOCHANG OF LANCANG, WEST YUNNAN AND ITS BIOGEOGRAPHIC CHARACTERISTICS[J].Earth Science-Journal of China University of Geosciences,1992(5). |
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| Authors: | Feng Qinglai Cui Xinsheng Liu Benpei |
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| Abstract: | Fossil bivalve reported here was collected from Laochang in Lancang, west Yunnan, includes 15 species (6 uncertain), 11 genera (2 uncertain) belonging to 9 families. The fauna is very similar to the bivalve fauna of Late Permian in South China and belongs to Tethysian realm in paleobiogeography.
Family Streblochondriidae Newell, 1937 Genus Xinanopecten gen. nov.
Type species: Xinanopecten orbicu laris gen. et sp. nov.
Diagnosis Shell medium in size, subcircular, acline. Left valve more convex than the right one. All ears triangular, sculptured with weak concentric lines, but anterior ear longer than the posterior. Radial costae wide and clear, concentric lines very weak in the middle and posterior parts of the shell body; but radial costae narrow and weak, concentric lines clear in the anterior part of the shell body. Costae growing bifurcately on the left and right valves.
Remarks The new genus is similar to streblochondria in the outline of the body and the ears, but differs from the latter in the ornamentation.
Distribution Southwestern China, Late Permian. |
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| Keywords: | Late Permian bivalve-fauna biogeography Lancang area |
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