Systematics
The genus Ramphotrigon formerly was considered to be related to Tolmomyias and Rhynchocyclus, two other genera of small tyrant flycatchers with broad bills . It is proposed that Ramphotrigon was more closely related to Myiarchus, due to shared derived features of the cranium and syrinx, and to shared similarities in nest site. Two recent phylogenetic analyses of DNA sequence data yielded somewhat incongruent information on the relationships of Ramphotrigon. Both studies confirmed, however, that Ramphotrigon is not at all closely related to Tolmomyias or Rhynchocyclus. It is found that Ramphotrigon is basal to a clade that includes Myiarchus (as well as Tyrannus and related genera),
Read more about this topic: Rufous-tailed Flatbill