蔣宏忱+侯衛(wèi)國

摘要：在中生代生態(tài)系統(tǒng)里，多瘤齒獸非常成功地開拓了比任何其它哺乳動(dòng)物都更加豐富多彩的植食生境。在白堊紀(jì)和古近紀(jì)，它們還發(fā)育了多種多樣的運(yùn)動(dòng)適應(yīng)。這里，我們報(bào)道一件產(chǎn)自中國晚侏羅世的最原始的多瘤齒獸化石。新發(fā)現(xiàn)的侏羅紀(jì)的多瘤齒獸的牙齒特征體現(xiàn)雜食的適應(yīng)，其保存完整的骨骼為所有多瘤齒獸最原始的骨骼特征提供了重要信息，特別是適于后足多種運(yùn)動(dòng)功能的高度靈活的踝關(guān)節(jié)，是白堊紀(jì)和古近紀(jì)多瘤齒獸后期成功進(jìn)化的關(guān)鍵。

關(guān)鍵詞：侏羅世；多瘤齒獸；哺乳動(dòng)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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