Brown-crested Flycatcher (Myiarchus tyrannulus) - HBW 9, p. 438

Taxonomy: Muscicapa tyrannulus Statius Muller, 1776, Cayenne.
Phylogenetic analysis of mitochondrial DNA places this species in a clade with M. yucatanensis, M. crinitus and M. cinerascens. It further suggests that M. nugator (formerly treated as conspecific) together with Caribbean, N Venezuelan and Colombian populations of present species may warrant separation at species level (as M. erythrocercus); also, that remaining populations of South America (nominate race and bahiae) belong to a different clade; additionally, that currently recognized races of North and Central America fall into a third clade (that may warrant recognition as M. cooperi). Morphological diversity among all populations is low. Possibility, nature and extent of any interaction and intergradation in Honduras and El Salvador between cooperi and brachyurus require study. Island taxa cozumelae and insularum weakly differentiated morphologically. Race bahiae reportedly intergrades with nominate. Revision needed of circumscription of this species and the races within it. Seven subspecies currently recognized.