| phylogeny of neotropical oryzomyine rodents (muridae: sigmodontinae) based on the nuclear irbp exon. | sigmodontine rodents are the most diverse family-level mammalian clade in the neotropical region, with about 70 genera and 320 recognized species. partial sequences (1266 bp) from the first exon of the nuclear gene encoding the interphotoreceptor retinoid binding protein (irbp) were used to infer the phylogenetic relationships among 44 species representing all 16 currently recognized genera of the largest sigmodontine tribe, the oryzomyini. monophyly of the tribe was assessed relative to 15 non- ... | 2003 | 13678688 |