Figure 7 in Evolution of the brain and sensory organs in Sphenisciformes: new data from the stem penguin Paraptenodytes antarcticus

Figure 7. Virtual endocasts of the labyrinth 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 posterior aspect. Abbreviations: aa, ampulla of anterior semicircular canal; asc, anterior semicircular canal; cc, common crus; ed, endolymphatic duct; ha, ampulla of horizontal semicircular canal; hsc, horizontal semicircular canal; lc, lagenar canal; pa, ampulla of posterior semicircular canal; psc, posterior semicircular canal; vf, vestibular foramen.