Abstract A new species of Euthema of mid-Cretaceous age (Cenomanian, ca. 99–98 Ma), E. annae sp. nov., is described on the basis of two shells in Burmese amber (northern Myanmar). It differs by the presence of a parietal inclusion in the aperture and by the weakly convex whorls with dense, diagonally aligned ribs on the last whorl. The genus Euthema is redescribed, and a new synonym recognised, Paleodiplommatina. A list of all currently described molluscan species from Burmese amber is provided. Lagocheilus electrospira is reassigned to the genus Eotrichophorus. The taxonomic diversity and abundance of molluscs in Burmese amber are discussed on the basis of 198 observed snail inclusions from amber trading exchange and published data. Apparently, molluscs are much more common in Burmese amber than in any other deposit of amber, with a notable predominance of Cyclophoroidea. There are no specimens that could indicate the presence of Stylommatophora, Ellobioidea or other “pulmonates”.

中文翻译：

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从白垩纪中期缅甸琥珀记录的软体动物清单，描述了一种陆地蜗牛，Euthema annae sp。十一月 (Caenogastropoda, Cyclophoroidea, Diplommatinidae)

摘要 白垩纪中期 (Cenomanian, ca. 99–98 Ma) 的 Euthema 新种 E. annae sp. 11 月，根据缅甸琥珀（缅甸北部）中的两个贝壳进行描述。它的不同之处在于孔径中存在顶叶内含物，以及最后一个螺纹上带有密集的、对角对齐的肋的弱凸螺纹。重新描述了 Euthema 属，并确认了一个新的同义词，Paleodiplommatina。提供了缅甸琥珀中所有目前描述的软体动物物种的清单。Lagocheilus Electrospira 被重新指定为 Eotrichophorus 属。缅甸琥珀中软体动物的分类多样性和丰度是根据从琥珀交易交易所观察到的 198 只蜗牛内含物和公布的数据进行讨论的。显然，软体动物在缅甸琥珀中比在任何其他琥珀矿中更为常见，Cyclophoroidea 占显着优势。没有标本可以表明柱形纲、Ellobioidea 或其他“肺纲”的存在。