Formerly united with O. fuscatus and O. lunatus in separate genus Haliplana. Geographical variation subtle, and subspecific divisions probably exaggerated; taxonomy in need of revision; nelsoni perhaps inseparable from melanopterus. Proposed forms recognitus (from West Indies, Belize and islands off N Venezuela) is included in melanopterus, and fuligula (Red Sea and E Africa to Persian Gulf and W India) in antarcticus; described forms rogersi (N Western Australia) and novaehollandiae (Queensland to S Australia) currently synonymized with nominate; further study desirable. Four subspecies currently recognized.
Food and feeding
Status and conservation
Only subscribers are able to see the bibliography. Login or Subscribe to get access to a lot of extra features!