Data from: Biogeographic regions of North American mammals based on endemism

Since the 19th century, two regions have been recognized for North
American mammals, which overlap in Mexico. The Nearctic region corresponds
to the northern areas and the Neotropical region to the southern ones.
There are no recent regionalizations for these regions under the criterion
of endemism. We integrate herein two methods to regionalize North America,
using species distribution models of mammals: Endemicity Analysis (EA) and
Parsimony Analysis of Endemicity (PAE). EA was used to obtain areas of
endemism and PAE to hierarchize them. We found 76 consensus areas from 329
sets, classified in 146 cladograms, and the strict consensus cladogram
shows a basal polytomy with 14 areas and 16 clades. The final
regionalization recognizes two regions (Nearctic and Neotropical) and a
transition zone (Mexican Transition Zone), six subregions (Canadian,
Alleghanian, Californian-Rocky Mountain, Pacific Central America, Mexican
Gulf-Central America and Central America), two dominions (Californian and
Rocky Mountain) and 23 provinces. Our analysis show that North America is
probably more complex than previously assumed.