Fast spread followed by anagenetic evolution in Eurasian and North American Amphimachairodus
Fast spread followed by anagenetic evolution in Eurasian and North American Amphimachairodus
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DOI：
10.1080/08912963.2022.2067756
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发表时间：
2022-05
影响因子：
1.4
通讯作者：
Xiaoming Wang;Ó. Carranza-Castañeda;Z. J. Tseng
中科院分区：
文献类型：
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作者：
Xiaoming Wang;Ó. Carranza-Castañeda;Z. J. Tseng
摘要在非洲、欧亚大陆和北美的晚中新世沉积物中，有大量但基本上是零碎的关于有魅力的剑齿猫Amphimachairodus的记录。该属有着复杂的分类历史，大部分的Amphimachairodus材料来自孤立的地区，通常在没有地层背景的情况下进行研究。在这里，我们分析了来自中国保德地层的长期连续记录，该地层在整个剖面中都产生了Amphimachairodus，并证明了A。palanderi-horribilis年代种演替代表了一个规模不断增大的原位再生演化的连续体。然后，我们合成的时间发生的Amphimachairodus从所有的泛北极记录和重新构建它们的进化作为一个案件的年代种继承。两个平行的再生谱系是明显的：一个欧亚A。第二种为北美A. coloradensis-alvarezi年代种演替后的移民事件在早期Hemphillian。除了更大的hypercarnivory证明牙齿专业化，欧亚血统显示出一个大的身体尺寸的趋势，而北美血统的大小减少。我们借此机会描述材料Amphimachairodus alvarezi从Yepómera（最新Hemphillian）在奇瓦瓦州，墨西哥，和以前未描述的材料从圣米格尔德阿连德盆地。本文综述了中国A. horribilis和相关分类群。
ABSTRACT The charismatic sabretooth cat Amphimachairodus has numerous but largely fragmentary records across late Miocene deposits of Africa, Eurasia and North America. The genus has a complex taxonomic history, and the majority of Amphimachairodus materials come from isolated localities, often studied without stratigraphic context. Here, we analyse the long, continuous records from the classic Chinese Baode strata, which produce Amphimachairodus throughout the section, and demonstrate that an A. palanderi-horribilis chronospecies succession represents a continuum of in situ anagenetic evolution of increasing size. We then synthesise chronological occurrences of Amphimachairodus from all Holarctic records and reframe their evolution as a case of chronospecies succession. Two parallel anagenetic lineages are evident: a Eurasian A. giganteus-palanderi-horribilis chronospecies succession and second, a North American A. coloradensis-alvarezi chronospecies succession following an immigration event in the early Hemphillian. In addition to greater hypercarnivory evidenced by dental specialisation, the Eurasian lineage shows a trend towards a large body size, whereas the North American lineage decreases in size. We take this opportunity to describe materials of Amphimachairodus alvarezi from Yepómera (latest Hemphillian) in the state of Chihuahua, Mexico, and previously undescribed materials from San Miguel de Allende Basin. We review taxonomic status of Chinese A. horribilis and related taxa.