孔子鸟目(鸟类：尾综骨类)的分类厘定

王敏, 邹晶梅, 周忠和

A taxonomical revision of the Confuciusornithiformes (Aves: Pygostylia)

WANG Min, Jingmai O’CONNOR, ZHOU Zhong-He

Fig. 4 Photograph of the holotype of Changchengornis hengdaoziensis, GMV 2129 Scale bars = 20 mm