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云南元谋晚中新世禄丰古猿地点的跳兔化石

拉纳·梅赫罗斯·法扎尔1,2,3   倪喜军1,2   李  强1,2   邱铸鼎1   杨阳河山4   

  1. (1 中国科学院古脊椎动物与古人类研究所,脊椎动物演化与人类起源重点实验室  北京 100044)
    (2 中国科学院大学地球与行星科学学院  北京 100049)
    (3 巴基斯坦哈兹大学动物学院  旁遮普德拉格哈兹汗 03221)
    (4 华东师范大学生态与环境科学学院  上海 200062)

A springhare from the Late Miocene Yuanmou Lufengpithecus site in Yunnan Province, China

Rana Mehroz FAZAL1,2,3   NI Xi-Jun1,2*  LI Qiang1,2   QIU Zhu-Ding1   YANG Yang-Heshan4   

  1. (1 Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese
     Academy of Sciences  Beijing 100044, China)
    (2 University of Chinese Academy of Sciences Beijing 100049, China   *Corresponding author: nixijun@ivpp.ac.cn)
    (3 Department of Zoology, Ghazi University Dera Ghazi Khan 03221, Punjab, Pakistan)
    (4 School of Ecological and Environmental Sciences, East China Normal University Shanghai 200062, China)

摘要:

跳兔类(跳兔科)化石在非洲大陆的中新世地层中比较常见,但在非洲之外却非常罕见。报道了跳兔类化石在东亚的首次发现。新的跳兔类化石产自云南元谋盆地晚中新世禄丰古猿(Lufengpithecus)地点,当时的古环境被认为是亚热带森林生态群系。尽管新材料只有一件左下前臼齿,但这件标本拥有一系列跳兔类的自近裔性状,包括柱状的高齿冠、两条脊和咀嚼面相对平坦。云南晚中新世新的跳兔类的下前臼齿具有短的下中沟和长的下次沟,以此区别于除了早中新世的Parapedetes属之外的所有非洲大陆内的跳兔类,被命名为亚非施氏跳兔新属新种(Storchipedetes afroasiaticus gen. et sp. nov.)。云南的跳兔化石可能代表了一支早期从跳兔科分化出来的支系,并且比它的非洲亲戚们更适应较封闭的环境。云南跳兔类化石所代表的绝灭支系可能是在早中新世新近纪哺乳动物“走出非洲”的第一波浪潮中从非洲扩散至亚洲。 

关键词: 云南元谋禄丰古猿地点, 晚中新世, 跳兔科, 跳兔

Abstract:

While scarce outside of Africa, fossils of springhares (Pedetidae) are common in the Miocene of the continent. We report on the first fossil record of springhare in East Asia. The new springhare fossil is from the Late Miocene Yuanmou Lufengpithecus site in Yunnan Province of China, the paleoenvironment of which is considered to be a subtropical forest biome. Although represented only by a single lower left premolar, the specimen exhibits a set of synapomorphies of pedetids, including a column-like high tooth crown, two lophids, and a relatively flat occlusal surface. The new springhare from the Late Miocene of Yunnan has a short mesostriid and long hypostriid in the lower cheek tooth, differing from all other pedetids with the exception of the Early Miocene Parapedetes from Africa. The Yuanmou springhare has been classified as Storchipedetes afroasiaticus gen. et sp. nov. It is likely that the Yunnan springhare represents an early divergent lineage of the Pedetidae that was adapted to a more closed environment than its African relatives. This extinct lineage probably dispersed to Asia as part of the first wave of the “out of Africa” Neogene mammals in the Early Miocene. 

Key words: Lufengpithecus site, Yuanmou, Yunnan, Late Miocene, Pedetidae, springhares