Inner Ear Evolution in Primates Through the Cenozoic: Implications for the Evolution of Hearing
Inner Ear Evolution in Primates Through the Cenozoic: Implications for the Evolution of Hearing
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DOI：
10.1002/ar.22422
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发表时间：
2012-04-01
影响因子：
2
通讯作者：
Boyer, Doug M.
中科院分区：
文献类型：
--
作者：
Coleman, Mark N.;Boyer, Doug M.
哺乳动物是唯一一种可以在高频范围(12千赫)听到声音的羊膜动物，但关于听觉模式进化发展的细节仍然知之甚少。在这项研究中，我们使用高分辨率X射线计算机断层扫描技术研究了21个灵长类化石物种(距今60 Ma)和25个现存真原生动物(灵长类、树鼠和飞狐猴)内耳的几个功能相关的听觉结构。检查的结构包括耳蜗长、骨性螺旋板的发育和椭圆形窗(如果存在的话，或腓骨踏板)的面积。使用这些测量，我们预测了低频和高频敏感度的方面，并表明灵长类动物的听力模式可能在新生代前半部分经历了几个阶段的演变。这些结果为现存谱系中听力模式的发展提供了时间界限，并有力地表明，祖先的尤阿康坦听力模式具有较好的高频听力特征，但相对较差的低频敏感性。他们还表明，单耳猴在灵长类(无论是现存的还是灭绝的)中都是独一无二的，因为它的耳蜗长得相对较长，对低频的敏感度也较高。我们将这些结果与其他更古老的古生物学证据结合起来，将这些发现放在更广泛的进化背景下。Anat Rec，295：615-631,2012。(C)2012年威利期刊公司。
Mammals are unique in being the only group of amniotes that can hear sounds in the upper frequency range (>12 kHz), yet details about the evolutionary development of hearing patterns remain poorly understood. In this study, we used high resolution X-ray computed tomography to investigate several functionally relevant auditory structures of the inner ear in a sample of 21 fossil primate species (60 Ma to recent times) and 25 species of living euarchontans (primates, tree shrews, and flying lemurs). The structures examined include the length of the cochlea, development of bony spiral lamina and area of the oval window (or stapedial footplate when present). Using these measurements we predicted aspects of low-frequency and high-frequency sensitivity and show that hearing patterns in primates likely evolved in several stages through the first half of the Cenozoic. These results provide temporal boundaries for the development of hearing patterns in extant lineages and strongly suggest that the ancestral euarchontan hearing pattern was characterized by good high-frequency hearing but relatively poor low-frequency sensitivity. They also show that haplorhines are unique among primates (extant or extinct) in having relatively longer cochleae and increased low-frequency sensitivity. We combined these results with additional, older paleontological evidence to put these findings in a broader evolutionary context. Anat Rec, 295:615-631, 2012. (C)2012 Wiley Periodicals, Inc.