Formerly united with O. anaethetus and O. lunatus in separate genus Haliplana. Geographical variation subtle: kermadeci may be better regarded as a synonym of serratus#R, and recognition of serratus and crissalis as races possibly not warranted. Proposed form somalensis (possibly endemic on Mait I, in Gulf of Aden) synonymized with nubilosus, but perhaps worthy of recognition; study required. Proposed form infuscatus (Indonesia) also subsumed within nubilosus. Seven subspecies currently recognized.
Food and feeding
Status and conservation
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