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. 2011 Apr 18;6(4):e18911. doi: 10.1371/journal.pone.0018911

Figure 3. Comparison of notothenioid divergence dates and geological events.

Figure 3

Phylogenetic nodes are labelled with letters U-X according to Fig. 1. The diversification of the Antarctic Clade (node X) coincides with an increase in frequency of glacial extensions well onto the shelf, the Mi-1 glacial event, the first occurences of sea-ice dependent diatoms in Antarctic waters, and a sharp decline of atmospheric CO2 levels. Paleoc.:Paleocene, Oligoc.:Oligocene, Pl.:Pliocene, P.:Pleistocene.