Fig. 2 Detail anatomy of Confuciusornis sanctus showing some diagnostic characters
A. right forelimb of C. sanctus IVPP V 10928 (hand in ventral view, humerus in cranial view); B. hindlimbs of C. sanctus V 11552 in dorsal view; C, D. photograph (C) and reconstruction (D) of the sternum of C. sanctus in dorsal view; E. sternal reconstruction of C. dui (modified from Hou et al., 1999); F. sternal reconstruction of Eoconfuciusornis zhengi (modified from Zhang et al., 2008) The arrowhead in A denotes the ridge on the craniaodorsal margin of the deltopectoral crest, and the arrow indicates the unfused carpometacarpus. The arrowheads in B mark the extensor retinaculum tubercle on the dorsal surface of the distal tibiotarsus (diagnostic character); and the arrows indicate the dorsal tubercles on metatarsals II and III. The arrows in D denote the cranial and caudal projections of the lateral process of the sternum in C. sanctus (diagnostic character). The dash lines in E indicate the length (vertical) and width (horizontal) of the sternum that are measured in this study Scale bars equal 10 mm in A and C, 5 mm in B; D-F not to scale
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