one plots the frequencies of cell occurrences for the 93 species, i.e., their
distribution frequencies, one sees
a typical “J-curve,” with the majority of species having highly restricted
ranges.Nearly ½ of the species are known from 5 or fewer cells and
therefore could be considered “rare.”Indeed, 19 species are
known from only a single cell (= “subpopulation”).The 16 cells in which these 19 species are only found are “irreplaceable” in terms of the
minimum areas (cells) necessary to conserve all 93 species.