Buka Swamphen (Porphyrio sp.)  

The Buka Swamphen is known only from (sub)fossil bones that had been found on the island of Buka, Solomon Islands.

The species has not yet been described, it was larger than any other member of its genus except for the likewise undescribed species recorded from the island of New Ireland. [1]

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The remains assigned to this species can be dated to Late Pleistocene age, the species, however, may well have survived into the Early Holocene and probably was soon extirpated by the first human settlers. [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: 18.05.2019