出典:Wikipedia
出典:『Wikipedia』 (2011/02/23 06:31 UTC 版)
Gansus is a genus of aquatic birds that lived during the Aptian or Albian age of the Early Cretaceous period (somewhere between 115 to 105 million years ago) in what is now Gansu province, western China. It is the oldest-known of the Ornithurae, the group which includes modern birds (Neornithes) and extinct related groups, such as Ichthyornis and Hesperornithes.