Marquesan Sandpiper (Prosobonia sp.)
This species is known from subfossil remains that were recovered from deposits on the island of Ua Huka, Marquesas. [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: 07.05.2021
Christmas Sandpiper (Prosobonia cancellata)
The Christmas Sandpiper was apparently restricted to the Kiritimati atoll in Kiribati when it was discovered, described and depicted during the third voyage under the command of Captain James Cook, which visited the atoll from 1777 to 1778; it might very well have once been much wider distributed in the archipelago.
The species disappeared due to the introduction of rats to its home, it might already have been on the brink of extinction when it was first met by Europeans and probably disappeared shortly after.
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edited: 07.05.2021
Henderon Island Sandpiper (Prosobonia sauli)
The Henderson Island Sandpiper is known from subfossil remains, which were compared to the bones of the extant Tuamotu Sandpiper (Prosobonia parvirostris (Peale)); it differed from that species by its longer leg bones and its reduced outer wing bones.
Given the fact that this species apparently had some reduced flight abilities, it might have indeed been restricted to Henderson Island. [1]
The species was finally described in 2020 as a new species, after having been known for almost 26 years. [2]
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References:
[1] Graham M. Wragg; Marshall I. Weisler: Extinctions and new records of birds from Henderson Island. Notornis 41: 61-70. 1994
[2] Vanesa L. De Pietri; Trevor H. Worthy; R. Paul Scofield; Theresa L. Cole; Jamie R. Wood; Kieren J. Mitchell; Alice Cibois; Justin J. F. J. Jansen; Alan J. Cooper; Shaohong Feng; Wanjun Chen; Alan J. D. Tennyson; Graham M. Wragg: A new extinct species of Polynesian sandpiper (Charadriiformes: Scolopacidae: Prosobonia) from Henderson Island, Pitcairn Island Group, and the phylogenetic relationships of Prosobonia. Zoological Journal of the Linnean Society 20: 1-26. 2020
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edited: 07.05.2021