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. 2008 Nov;35(11):2102–2118. doi: 10.1111/j.1365-2699.2008.01942.x

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Journal compilation © 2008 Blackwell Publishing Ltd

Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.

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Superimposition of the geographical ranges of Microdipodops pallidus Merriam (black and white distributions) and M. megacephalus Merriam (grey-shaded distribution) showing the coincidence of the distributional boundary between the eastern and western phylogroups of M. pallidus with the distributional border of M. megacephalus in south-central Nevada. The inset shows a reduced distribution map of M. megacephalus for comparison. The mean elevation of M. pallidus localities in the area of overlap of the eastern clade with the distribution of M. megacephalus is significantly different (and higher) than the mean elevation of the localities in the western clade (see text for discussion).