This triller is endemic to Indonesia's Tanimbar Islands. It forages in the upper forest for fruit and small arthropods.
It has black upperparts with a blue-green gloss, a white eyebrow, white wing-bars, a white rump, and white underparts. The sexes are similar.
It uses lowland forest, edges, secondary growth, scrub, gardens, and mangroves. It takes fruit and arthropods in the canopy and middle storey.
An extinction-risk assessment has not been added yet.