Novel 3D Scanning and Multi-Angle Analysis Uncover the Ontogenetic Developmental Dynamics of the Skull in Vespertilio sinensis.

The mammalian skull, which surrounds and protects the brain, is one of the most morphologically diverse and functionally important structures in the vertebrate body. As one of the most ecologically diverse mammals, the developmental dynamics of morphological and structural changes and functional diversity in the skull of bats need to be revealed. Here, we focused on the developmental characteristics of the Vespertilio sinensis skull, and used statistical analysis, spatial morphology visualization, and comparative analysis of the Stretch Factors (SF) of the masticatory muscles to better understand the connection between the morphology of the skull and the development of the body size during the developmental process of V. sinensis, the changes in the three-dimensional (3D) spatial morphology and structure, and the correlations between opening capacity and the transformation of feeding habits. This study not only provides a new perspective for understanding the morphological adaptive mechanism of ecological niche expansion that accompanies the transition of mammalian skulls from juvenile to adult feeding but also provides a crucial scientific basis for an in-depth understanding of the growth and developmental mechanism of bats' skull and even vertebrates as a whole, which is potentially useful for the development of ecological conservation and evolutionary biology.