The innermost feathers of its tail are black and the outermost approximately 80% white, with those between intergrading.

The reserve is "on [the] border of ecoregions characterized as Napo moist forest and Iquitos várzea.

It actively forages in the upper quarter of trees with mixed-species flocks, usually gleaning from the ends of branches and sometimes sallying out to catch flying insects.

[4] "The nest, eggs, and breeding behavior of Iquitos Gnatcatcher remain undescribed.

Those data and "continuing loss of [its] apparently specialized white-sand forest habitat" meet the IUCN criteria for Critically Endangered status.