Formerly united with O. fuscatus and O. anaethetus in separate genus Haliplana. Monotypic.
Northern Mariana Is E through Wake I and N Marshall Is to Hawaiian Is, and S through Phoenix and Line Is to Fiji, then E to Tuamotu Is and Austral Is; possibly formerly at Easter I; possibly also Samoa and Society Is. Wanders irregularly W to N Moluccas.
Food and feeding
Status and conservation
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