Figure 2. Pectoral girdle and sternum of Archaeornithura meemannae gen. et sp. nov., in comparison with other hongshanornithids.

(a) STM7-163, counter slab (zyphoid process of the sternum is outlined by a dash line); (b) STM7-145, main slab; (c) photograph and (d) line drawing of STM7-145, counter slab. Line drawing (not scaled) of furcula and sternum of other hongshanornithids: (e) Hongshanornis longicresta; (f) Longicrusavis houi; (g) Tianyuornis cheni; (h) Parahongshanornis chaoyangensis. Anatomical abbreviations: ca, carina; co, coracoid; cv, cervical vertebrae; fu, furcula; hy, hypocleidium; lt, lateral trabecula of the sternum; ne, supracoracoidal nerve foramen; pc, procoracoid process; sc, scapula; sl, sternocoracoidal process; st, sternum; uc, uncinate process; zp, zyphoid process of the sternum. Scale bars, 5 mm.