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. 2017 Feb 21;5:e3024. doi: 10.7717/peerj.3024

Figure 16. Stratigraphically calibrated strict consensus phylogenetic tree of Phocidae.

Figure 16

Phylogenetic analysis performed with PAUP version 4.0b10 for Macintosh (Swofford, 2002). Stratigraphic range data for extinct Monachinae derived from http://www.paleobiodb.org/ and published accounts for each taxon. Stratigraphic range for Leptophoca proxima based on biostratigraphic data presented in this study and unpublished stratigraphic data. Stratigraphic range of Prophoca rousseaui possibly extendable to 7.2 Ma based on biostratigraphy. Geological time scale based on Cohen et al. (2013). Red dots represent corrected divergence dates at major nodes, published by Higdon et al. (2007). Other nodes are graphical heuristics and do not reflect time-calibrated divergence dates. Abbreviations: Paleog., Paleogene; Q., Quaternary; Pleisto., Pleistocene.