| phylogeography and molecular systematics of the peromyscus aztecus species group (rodentia: muridae) inferred using parsimony and likelihood. | mice of the peromyscus aztecus species group occur at mid to high elevations in several mountain ranges in the highlands of middle america (mexico and central america), a region of high endemicity. we examined the biogeography of this group by conducting phylogenetic analyses of 668 bp of the mitochondrial cytochrome b (cyt b) gene. phylogenetic analyses under both parsimony and likelihood frameworks produced the same topologies, but estimates of nodal support were artificially high in weighted ... | 1997 | 11975329 |