Fig. 25 in The Basal Penguin (Aves: Sphenisciformes) Perudyptes Devriesi And A Phylogenetic Evaluation Of The Penguin Fossil Record

Fig. 25. Coracoids of selected penguin taxa, illustrating phylogenetic characters: (A) the stem penguin Archaeospheniscus lowei (OM GL407); (B) extant Aptenodytes forsteri (AMNH 3767). The bone is incomplete in A, causing the proximal end to appear less widened. Broken edges suggest that the coracoid fenestra was originally completely enclosed in A. Scale bars 5 1 cm. See appendix 5 for abbreviations.