Chapter 15 The Murine Cradle
Chapter 15 The Murine Cradle
复制标题
第15章鼠类摇篮
DOI：
10.1007/978-3-030-49753-8_15
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
L. L. Jacobs
中科院分区：
文献类型：
--
作者：
Flynn L. J.;Y. Kimura;L. L. Jacobs
印度次大陆独特的地质、地球物理和构造环境创造了一个进化舞台，为许多中生代和新生代早期脊椎动物群体的起源和早期多样化提供了一个相对隔绝的避难所。这种现象一直持续到中新世，伴随着自然屏障的发展：山脉、主要河流系统和海洋边界。陆地屏障是半透性的过滤器，它允许选择的生物通过差异通道，并允许某些分支的地方性进化。现代级别的鼠形目啮齿类动物是在中新世早期进化的，部分是在它们出现在次大陆之后地方性进化的。一个地方性的鼠类谱系导致了鼠科，现存的小鼠和大鼠，而印度和巴基斯坦半孤立的物理环境促进了中新世中期小鼠的局部进化，在此之前，它们在大约1000万年前分散到欧亚大陆和更远的地方。在这里，我们注意到在鼠科进化早期出现的牙齿形态特征，以记录导致现存老鼠的两个主要分支的分化。在磨牙表型的明确分类分离之前，它们最早的假定成员在较老的样品中形态相似。
The unique geological, geophysical, and tectonic setting of the Indian Subcontinent created a theater of evolution that provided a relatively insulated refuge for origination and early diversification of many Mesozoic and early Cenozoic age vertebrate groups. This phenomenon continued into the Miocene Epoch in association with developing physical barriers: mountains, major river systems, and oceanic borders. The terrestrial barriers were semi-permeable filters that allowed differential passage of select organisms, and endemic evolution of certain clades. Muroid rodents of modern grade are a group that evolved by the earliest Miocene, in part endemically after they appeared on the subcontinent. One endemic muroid lineage led to the Murinae, extant mice and rats, and the semi-isolated physical setting of India and Pakistan promoted local evolution of murines during the middle Miocene, prior to their dispersion throughout Eurasia and beyond around ten million years ago. Here we note dental morphological features that appeared early in the evolution of Murinae to document the divergence of two major clades leading to extant murines. Their earliest presumed members are morphologically similar in older samples before clear taxonomic separation of molar phenotypes.