Nukuhiva Swamphen (Zapornia sp.)
This extinct form is currently known fonly from a few subfossil remains, which were found on the island of Nuku Hiva, Marquesas.
The species has not been described so far. [1]
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References:
[1] David W. Steadman: Extinction and Biogeography of Tropical Pacific Birds. University of Chicago Press 2006
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edited: 13.09.2020