Three enigmatic genera of waterfowl, Mionetta from the Late Oligocene to Middle Miocene of central Europe and Dunstanetta and Manuherikia from the Bathans Early/Middle Miocene of Otago, New Zealand, show some similarities to oxyurine ducks and judging from biogeography, the latter two may plausibly be related.
The wide flat plateau of the Maniototo which lies between the upper reaches of the Taieri River and the Clutha's northern tributary the Manuherikia is also usually considered part of Central Otago.