亚洲最古老鸽子(Columbidae)物种有效性再检验：北京周口店早更新世丛氏原鸽(Columba congi)

沈韦, Thomas A. STIDHAM, 李志恒

Reexamination of the oldest pigeon (Aves: Columbidae) from Asia: Columba congi from the Early Pleistocene of Zhoukoudian, Beijing, China

SHEN Wei, Thomas A. STIDHAM, LI Zhi-Heng

Fig. 2 Comparison of proximal pigeon humeri in ventral view illustrating a potential diagnostic feature A. Columba congi (IVPP V 6436.1); B. C. rupestris (IVPP OV 869) Arrow indicates the convex margin of the rim of the pneumotricipital fossa Abbreviations: bc. bicipital crest; h. humeral head; tg. transverse ligamental groove. Scale bar=5 mm