Figure 2 in Evolution of the brain and sensory organs in Sphenisciformes: new data from the stem penguin Paraptenodytes antarcticus

Figure 2. Virtual endocasts of A, Gavia immer (common loon); B, Phoebastria immutabilis (Laysan albatross); C, Paraptenodytes antarcticus (fossil stem penguin); D, Spheniscus humboldti (Humboldt penguin); E, Aptenodytes patagonicus (king penguin); and F, Pygoscelis antarctica (chinstrap penguin) in rostral aspect. Olfactory bulbs are slightly truncated in E and F because of scan length. Abbreviations: c, cerebrum; cca, cranial carotid artery; mo, medulla oblongata; ob, olfactory bulb; ol, optic lobe; pb, pituitary body; se, sagittal eminence; II-XI, cranial nerves II-XI.