| out of asia: natricine snakes support the cenozoic beringian dispersal hypothesis. | based on a combination of six mitochondrial gene fragments (12s rna, cyt b, nd1, nd2, nd4 and co1) and one nuclear gene (c-mos) from 22 genera we infer phylogenetic relationships among natricine snakes and examine the date and area of origin of these snakes. our phylogenetic results indicate: (1) the subfamily natricinae is strongly supported as monophyletic including a majority of extant genera, and a poorly known and previously unassigned species trachischium monticola, (2) two main clades are ... | 2012 | 22430561 |