Mammalian skull heterochrony reveals modular evolution and a link between cranial development and brain size

被引：0
作者：
Daisuke Koyabu
Ingmar Werneburg
Naoki Morimoto
Christoph P. E. Zollikofer
Analia M. Forasiepi
Hideki Endo
Junpei Kimura
Satoshi D. Ohdachi
Nguyen Truong Son
Marcelo R. Sánchez-Villagra
机构：
[1] Palaeontological Institute and Museum,Department of Anatomy and Cell Biology
[2] University of Zürich,undefined
[3] The University Museum,undefined
[4] The University of Tokyo,undefined
[5] Anthropological Institute and Museum,undefined
[6] University of Zürich,undefined
[7] Ianigla,undefined
[8] CCT-Mendoza,undefined
[9] CONICET,undefined
[10] Avda. Ruiz Leal s/n,undefined
[11] College of Veterinary Medicine,undefined
[12] Seoul National University,undefined
[13] Institute of Low Temperature Science,undefined
[14] Hokkaido University,undefined
[15] Institute of Ecology and Biological Resources,undefined
[16] Vietnam Academy of Science and Technology,undefined
来源：
Nature Communications | / 5卷
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摘要：
The multiple skeletal components of the skull originate asynchronously and their developmental schedule varies across amniotes. Here we present the embryonic ossification sequence of 134 species, covering all major groups of mammals and their close relatives. This comprehensive data set allows reconstruction of the heterochronic and modular evolution of the skull and the condition of the last common ancestor of mammals. We show that the mode of ossification (dermal or endochondral) unites bones into integrated evolutionary modules of heterochronic changes and imposes evolutionary constraints on cranial heterochrony. However, some skull-roof bones, such as the supraoccipital, exhibit evolutionary degrees of freedom in these constraints. Ossification timing of the neurocranium was considerably accelerated during the origin of mammals. Furthermore, association between developmental timing of the supraoccipital and brain size was identified among amniotes. We argue that cranial heterochrony in mammals has occurred in concert with encephalization but within a conserved modular organization.
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