Ito Kai, Tu Vuong Tan, Eiting Thomas P, Nojiri Taro, Koyabu Daisuke
Department of Anatomy, Tissue and Cell Biology, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
Front Cell Dev Biol. 2021 Mar 23;9:613545. doi: 10.3389/fcell.2021.613545. eCollection 2021.
Multiple corrugated cartilaginous structures are formed within the mammalian nasal capsule, eventually developing into turbinals. Due to its complex and derived morphology, the homologies of the bat nasal turbinals have been highly disputed and uncertain. Tracing prenatal development has been proven to provide a means to resolve homological problems. To elucidate bat turbinate homology, we conducted the most comprehensive study to date on prenatal development of the nasal capsule. Using diffusible iodine-based contrast-enhanced computed tomography (diceCT), we studied in detail the 3D prenatal development of various bat species and non-bat laurasiatherians. We found that the structure previously identified as "maxilloturbinal" is not the true maxilloturbinal and is only part of the ethmoturbinal I pars anterior. Our results also allowed us to trace the evolutionary history of the nasal turbinals in bats. The turbinate structures are overall comparable between laurasiatherians and pteropodids, suggesting that pteropodids retain the ancestral laurasiatherian condition. The absence of the ethmoturbinal I pars posterior in yangochiropterans and rhinolophoids has possibly occurred independently by convergent evolution.
在哺乳动物的鼻囊中形成了多个波纹状软骨结构，最终发育成鼻甲。由于其复杂且衍生的形态，蝙蝠鼻甲的同源性一直存在高度争议且不确定。事实证明，追踪产前发育为解决同源性问题提供了一种方法。为了阐明蝙蝠鼻甲的同源性，我们对鼻囊的产前发育进行了迄今为止最全面的研究。使用基于可扩散碘的对比增强计算机断层扫描（diceCT），我们详细研究了各种蝙蝠物种和非蝙蝠劳亚兽类的三维产前发育。我们发现，先前被鉴定为“上颌鼻甲”的结构并非真正的上颌鼻甲，只是筛鼻甲I前部的一部分。我们的研究结果还使我们能够追溯蝙蝠鼻甲的进化历史。劳亚兽类和狐蝠科之间的鼻甲结构总体上具有可比性，这表明狐蝠科保留了劳亚兽类的祖先状态。阳翼手目和菊头蝠科中筛鼻甲I后部的缺失可能是通过趋同进化独立发生的。
