First records of freshwater rissooidean gastropods from the Palaeogene of Southeast Asia

First records of freshwater rissooidean gastropods from the Palaeogene of Southeast Asia
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东南亚古近纪淡水里索亚科腹足动物的首次记录

DOI:
10.1093/mollus/eys011
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发表时间:
2012
影响因子:
1.2
通讯作者:
Prieto
Prieto
中科院分区:
生物学3区
文献类型:
--
作者:
Neubauer;Schneider;Böhme;Prieto

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本文首次报道了越南北部(曹邦盆地)古近纪(始新世最晚至下渐新世)淡水类腹足类的新记录。该组合中最丰富的元素是新的芽孢杆菌属(Pomatiopsidae:Tousinae?),由属于两个新种的大量保存完好的标本组成,即B.nhamaygachensandB.东邦。该组合还包含另外两个保存不佳的物种的标本,其中一个暂时被归类为双鱼科。曹邦组合是东南亚最早描述的新生代淡水腹足动物群之一,芽孢杆菌是古近纪唯一有记录的古足类。这一时期越南北部芽孢杆菌的出现表明,古红河可能是细菌亚科的早期扩散走廊。这些腹足类很可能生活在曹邦湖的三角洲平原上,被鲤科鱼类捕食。
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 genusBacbotricula(Pomatiopsidae: Triculinae?), comprising numerous well-preserved specimens belonging to two new species,B. nhamaygachensisandB. 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 andBacbotriculais the only pomatiopsid that has been recorded for the Palaeogene. The occurrence ofBacbotriculain 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.
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