Burmese amber continues to provide unique insights into the terrestrial biota inhabiting tropical equatorial forests during mid-Cretaceous time. In contrast to the large amount and great diversity of terrestrial species retrieved so far, aquatic biota constitute rare inclusions. Here we describe the first freshwater snail ever preserved in amber. The new species Galba prima sp. nov. belongs in the family Lymnaeidae, today a diverse and near globally distributed family. Its inclusion in terrestrial amber is probably a result of the amphibious lifestyle typical of modern representatives of the genus. The finding of a freshwater snail on the Burma Terrane, back then an island situated at some 1500 km from mainland Asia, has implications for the dispersal mechanisms of Mesozoic lymnaeids. The Cenomanian species precedes the evolution of waterfowl, which are today considered a main vector for long-distance dispersal. In their absence, we discuss several hypotheses to explain the disjunct occurrence of the new species.

中文翻译：

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琥珀中保存的第一个淡水腹足动物表明在白垩纪进行了长距离传播

缅甸琥珀继续为白垩纪中期居住在热带赤道森林的陆地生物群提供独特的见解。与迄今为止检索到的大量和多样性的陆地物种相比，水生生物群构成了稀有的内含物。在这里，我们描述了第一只保存在琥珀中的淡水蜗牛。新物种最初的加尔巴sp。十一月 属于Lymnaeidae家族，今天是一个多样化且近乎全球分布的家族。它包含在陆地琥珀中可能是该属现代代表典型的两栖生活方式的结果。在当时距离亚洲大陆约 1500 公里的缅甸地块上发现了淡水蜗牛，这对中生代 lymnaeids 的传播机制具有重要意义。Cenomanian 物种早于水禽的进化，今天被认为是长距离传播的主要媒介。在他们缺席的情况下，我们讨论了几个假设来解释新物种的分离出现。