| recent divergence with gene flow in tennessee cave salamanders (plethodontidae: gyrinophilus) inferred from gene genealogies. | cave organisms occupy a special place in evolutionary biology because convergent morphologies of many species demonstrate repeatability in evolution even as they obscure phylogenetic relationships. the origin of specialized cave-dwelling species also raises the issue of the relative importance of isolation vs. natural selection in speciation. two alternative hypotheses describe the origin of subterranean species. the 'climate-relict' model proposes allopatric speciation after populations of cold ... | 2008 | 18410292 |