Fig. 5
From: On the taxonomy and osteology of the Early Eocene North American Geranoididae (Aves, Gruoidea)
Eogrus aeola (Eogruidae), tentatively referred left coracoid (AMNH 2941) from the Middle Eocene of the Irdin Manha Formation of the Shara Murun region in Inner Mongolia (China), in a dorsal, b medial, and c ventral view. Coracoids of extant Gruoidea in dorsal view: d Psophia crepitans (Psophiidae). e Aramus guarauna (Aramidae). f Balearica regulorum (Gruidae). csc cotyla scapularis, fns foramen nervi supracoracoidei, ppc processus procoracoideus, and rdg ridge-like scars. Scale bars 10Â mm