Dissertation Research: Molecular Systematics of Xenarthrans

论文研究：Xenarthrans 的分子系统学

• 批准号: 9423665
• 负责人: Mary Ashley
• 金额: $ 1万
• 依托单位: University of Illinois at Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-03-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423665&HistoricalAwards=false
• 关键词: Dissertation; Research; Molecular; Systematics; Xenarthrans

9423665 Ashley The proposed research involves a molecular systematic study of the mammalian order Xenarthra (sloths, armadillos, and anteaters) and their close relatives the Pholidota (pangolins or scaly anteaters). The relationships among these taxa and with other mammalian orders remain controversial. Establishing or refuting the position of the Xenarthra as a basal lineage of mammals is critical for interpreting the overall pattern of mammalian evolution. %%% In addition the data will provide important information on the biogeographic history of the group from its South American origin and dispersal to Central American and the Antilles. If xenarthrans are closely related to pangolins which are known from Africa, Asia and Europe and possibly North America it suggests a testable hypothesis, divergence of these groups that would have predated the separation of Africa and South America which occurred 85 million years ago. This would push back considerably the timing of the radiation of eutherian mammals. ***

9423665阿什利 拟议的研究涉及对哺乳动物Xenarthra（树懒，犰狳和食蚁兽）及其近亲Pholidota（穿山甲或有鳞食蚁兽）的分子系统研究。这些分类群之间的关系和与其他哺乳动物的订单仍然存在争议。 建立或反驳的立场，Xenarthra作为一个基础的血统的哺乳动物是至关重要的解释整体模式的哺乳动物进化。 %%% 此外，这些数据将提供有关该群体从南美洲起源到中美洲和安的列斯群岛传播的地理历史的重要信息。如果xenarthrans与非洲，亚洲和欧洲以及可能的北美的穿山甲密切相关，这表明了一个可验证的假设，这些群体的分歧早于8500万年前发生的非洲和南美洲的分离。这将大大推迟真兽目哺乳动物的辐射时间。 ***