蒋宏忱+侯卫国
摘要：在中生代生态系统里，多瘤齿兽非常成功地开拓了比任何其它哺乳动物都更加丰富多彩的植食生境。在白垩纪和古近纪，它们还发育了多种多样的运动适应。这里，我们报道一件产自中国晚侏罗世的最原始的多瘤齿兽化石。新发现的侏罗纪的多瘤齿兽的牙齿特征体现杂食的适应，其保存完整的骨骼为所有多瘤齿兽最原始的骨骼特征提供了重要信息，特别是适于后足多种运动功能的高度灵活的踝关节，是白垩纪和古近纪多瘤齿兽后期成功进化的关键。
关键词：侏罗世；多瘤齿兽；哺乳动物
Discovery of Earliest Jurassic Multituberculate mammals in Liaoning， China
Abstract：Multituberculates were successful herbivorous mammals and were more diverse and numerically abundant than any other mammal groups in Mesozoic ecosystems. The clade also developed diverse locomotor adaptations in the Cretaceous and Paleogene. We report a new fossil skeleton from the Late Jurassic of China that belongs to the basalmost multituberculate family. Dental features of this new Jurassic multituberculate show omnivorous adaptation， and its well-preserved skeleton sheds light on ancestral skeletal features of all multituberculates， especially the highly mobile joints of the ankle， crucial for later evolutionary success of multituberculates in the Cretaceous and Paleogene.
Keywords：Jurassic； Multituberculate； mammals
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