Synapsids were one of the four main divisions of early reptilian life, the others being anapsids, euryapsids, and diapsids.
下孔亚纲是早期4要部之一,其他3部分别是缺孔亚纲、调孔亚纲和双孔亚纲。
关注我们的微信
下载手机客户端
划词翻译
详细解释