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首页> 外文期刊>Journal of Molluscan Studies >First records of freshwater rissooidean gastropods from the Palaeogene of Southeast Asia
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First records of freshwater rissooidean gastropods from the Palaeogene of Southeast Asia

机译：东南亚古近纪的淡水里索类腹足动物的初步记录

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This paper provides the first records of freshwater rissooidean gastropods from the Palaeogene (uppermost Eocene to Lower Oligocene) of northern Vietnam (Cao Bang Basin). The most abundant element of the assemblage is the new genus Bacbotricula (Pomatiopsidae: Triculinae?), comprising numerous well-preserved specimens belonging to two new species, B. nhamaygachensis and B. dongbangensis. The assemblage also contains poorly preserved specimens of two other species, one of which is tentatively assigned to the Bithyniidae. The Cao Bang assemblage is among the earliest Cenozoic freshwater gastropod faunas described from Southeast Asia and Bacbotricula is the only pomatiopsid that has been recorded for the Palaeogene. The occurrence of Bacbotricula in northern Vietnam during this period of time suggests that the palaeo-Red River may have served as an early dispersal corridor for the Triculinae. The gastropods likely lived on deltaic plains in Lake Cao Bang and were preyed upon by cyprinid fishes.
机译：本文提供了越南北部（曹邦盆地）古近纪（最高始新世至下渐新世）的淡水里索类腹足动物的最初记录。组合中最丰富的元素是新芽孢杆菌属（Bacbotricula）（Pomatiopsidae：Triculinae？），其中包括许多保存完好的标本，分别属于B. nhamaygachensis和B. dongbangensis。该组合还包含保存较差的另外两个物种的标本，其中一个暂定归类为Bithyniidae。 Cao Bang组合是东南亚描述的最早的新生代淡水腹足动物群之一，而Bacbotricula是唯一记录到古近纪的pomatiopsid。在这段时间里，越南北部的芽孢杆菌的出现表明古红河可能已成为三角藻的早期扩散通道。腹足动物可能生活在草帮湖的三角洲平原上，并被鲤科鱼类捕食。

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