The Iphis Monarch occurs on Ua Huka in the Marquesas Islands. It lives in valley forests and eats insects. Its plumage differs by sex and age.
Adult males are black and white and become darker with age. Females are brown-grey above and cream below; juveniles are light brown with a yellow bill.
The species profile describes it feeding on insects in forests along valleys.
An extinction-risk assessment has not been added yet.