Abstract: Recent collections from six sections, Lanongla area, Tethyan Himalaya allow the establishment of four Buchia subokensis, In ascending order they are Buchia concentrica-Buchia spitiensis; Buchia mosquensis-Buchia rugosa; Buchia fischiana-Buchia blanfordiana; Buchia subokensis assemblage. These Buchia assemblages first demonstrate that not only the Upper Jurassic strata but also the highest Buchia assemblage Buchia subokensis are present in the Lanongla area, which appeared in Lower Cretaceous strata all over the world. This first records the highest Buchia assemblage in Lanongla area.

Key words: Tethyan Himalaya area, Buchia, Upper Jurassic, Lower Cretaceous

摘要： 通过藏南喜马拉雅地区聂拉木至古措地区6个剖面中雏蛤的研究，发现该地区除前人发现的晚侏罗世雏蛤外，还含有 Buchia subokensis，(在世界其他产地都出现于早白垩世地层)，并研究识别出 Buchia concentrica-Buchia spitiensis; Buchia mosquensis-Buchia rugosa; Buchia fischiana-Buchia blanfordiana; Buchia subokensis 4个雏蛤组合。首次记述了该区最高层位的雏蛤组合，同时，新发现的 Buchia subokensis 雏蛤生物组合为藏南存在下白垩统提供了新的生物证据。

关键词: 特提斯喜马拉雅, 雏蛤, 上侏罗统, 下白垩统