Coopmans’s tyrannulet is a small bird recorded from Colombia’s Sierra Nevada de Santa Marta and eastern Venezuela. It has yellow markings; the original type specimen had a 43 mm wing and 37 mm tail.
Its yellow markings and mantle differ in tone from those of Zimmerius chrysops. The original type specimen had a 43 mm wing and 37 mm tail.
During field observations in Santa Marta between December 2015 and January 2016, one bird was recorded high in a tree.
An extinction-risk assessment has not been added yet.