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Map depicting the geographic ranges of wing‐propelled diving clades. Ranges for extant species correspond to those summarized in del Hoyo et al. (1992, 1996, 2005). The geographic range of Pan‐Alcidae extended further to the south in the Western Atlantic Ocean as recently as the Pleistocene (Smith & Clarke, 2015). Fossil localities for Plotopteridae are those summarized by Mayr et al. (2015)
