The Greenish Tyrannulet is now being recognized as separate species, being now an Atlantic Forest endemic. It is found in humid forest and tall second growth below approximately 1000 m, from southeast Brazil south to southeastern Paraguay and northeastern Argentina. The species’ plumage is typical of most Phyllomyias tyrannulets, the Greenish Tyrannulet being mainly olive-green above, with obvious double wing bars, a pale supercilium, and pale yellowish-white underparts. It is usually a relatively common bird, and it frequently joins mixed-species flocks foraging in the canopy and at middle levels. Diet is poorly known but can include arthropods. Forages at all heights in interior and edges of forest, sometimes within 2 m of ground. Not globally threatened and apparently not entirely dependent on undisturbed forest; found also in secondary vegetation and edge habitat.
