Five land snails and the borings of marine bivalves are reported from Hkamti (Khamti) amber whose age was recently uranium-lead dated to be ca. 110 Ma, in contrast to the nearby Kachin (‘Burmese’) amber considered to be ca. 99 Ma. Four of the snails belong to Cyclophoridae, and although their condition does not allow unambiguous identification or description of the species, one of them strongly resembles Archaeocyclotus plicatula Asato and Hirano in Hirano et al., 2019 from Kachin amber. The fifth snail, Euthema myanmarica n. sp. (Diplommatinidae), is a representative of a genus that was known exclusively from Kachin amber until now. The genus Euthema Yu, Wang, and Pan, 2018 is revised, with a new synonym, Xenostoma Bullis et al., 2020. The recently described ‘Truncatellina dilatatus’ Yu, 2020 from Kachin amber is placed in Euthema. A comparison of the distinguishing characters of the eight Euthema species is provided. The borings of bivalves in Hkamti amber correspond to the ichnospecies Teredolites clavatus Leymerie, 1842, associated with the bivalve genus Martesia Sowerby, 1824 (Pholadidae), and are common in Kachin amber. Similarity of the malacofauna from Hkamti and Kachin ambers, as well as the presence of numerous, similar Teredolites clavatus, indicates that these ambers were formed in very similar paleoenvironments. This indication suggests that forests with very similar conditions existed throughout the entire Albian to the early Cenomanian, or that the dating of at least one of these amber deposits is incorrect. In the latter case, it would mean that Kachin amber is at least 110 Ma or older.UUID: http://zoobank.org/142f10a2-307f-4053-9b29-8aa18db66219

中文翻译：

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来自白垩纪中期 Hkamti 琥珀（缅甸）的软体动物的首次记录，并描述了一种陆地蜗牛 Euthema myanmarica n。sp。(Caenogastropoda, Cyclophoroidea, Diplommatinidae)

据报道，从 Hkamti (Khamti) 琥珀中发现了五只陆地蜗牛和海洋双壳贝类的钻孔，其年龄最近是铀铅，可追溯到 ca。110 Ma，与附近的克钦（'缅甸'）琥珀形成对比，被认为是 ca。99 马。其中四只蜗牛属于环线虫科，虽然它们的状况不允许明确识别或描述该物种，但其中一只非常相似褶裥古环虫Asato 和 Hirano 在 Hirano 等人，2019 年来自克钦琥珀。第五只蜗牛，缅甸药草n. sp。（Diplommatinidae），是迄今为止仅从克钦琥珀中知道的一个属的代表。属尤西玛Yu, Wang, and Pan, 2018 修订，新的同义词，异种口Bullis 等人，2020 年。最近描述的“蒺藜' Yu, 2020 来自克钦琥珀尤西玛. 八种性格特征对比尤西玛提供物种。Hkamti 琥珀中双壳类的钻孔对应于 ichnospecies棒状石榴石Leymerie，1842，与双壳类有关马蒂西亚Sowerby, 1824 (Pholadidae)，在克钦琥珀中很常见。来自 Hkamti 和克钦琥珀的马拉科动物的相似性，以及大量相似的存在棒状石榴石，表明这些琥珀是在非常相似的古环境中形成的。这一迹象表明，在整个阿尔比纪到塞诺曼纪早期，整个阿尔比纪都存在条件非常相似的森林，或者这些琥珀矿床中至少有一个的年代是不正确的。在后一种情况下，这意味着克钦琥珀至少为 110 Ma 或更早。UUID：http://zoobank.org/142f10a2-307f-4053-9b29-8aa18db66219