Figure 5.

Polar stereographic projection to 35 °S at 40, 25, 15 and 5 mya. Reconstructions have continents represented by present-day shorelines (ODSN 2004). Antarctica is indicated as partially (b–c) and fully covered in ice (d–f) (Shevell et al. 2004). Genera are represented by different coloured capital letters, following the coloured names indicated at the bottom. As they start to diversify, species are represented by small letters according to the first letter of common names given in figure 2, except royal penguin represented by r1. Oldest and biggest penguin fossils (Simpson 1976; Clarke et al. 2004) are numbered 1–6 and projected at (a) 40 and (b) 25 mya. The Antarctic circumpolar current, indicated by arrows in the reconstruction at 25 mya only, was formed at the end of the Oligocene.