The Pallid Amber Snail was confined to the sister islands of Ra’iatea and Taha’a, where it was historically very abundant and could be found on any moist places on the ground.
The species, which was described in 1847, is now extinct.
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References:
[1] Justin Gerlach: Land and Freshwater Snails of Tahiti and the other Society Islands. Phelsuma Press, Cambridge 2017
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edited: 26.11.2018
Guam Amber Snail (Succinea guamensis)
The Guam Amber Snail was described in 1857, it is thought to be endemic to the island of Guam, Mariana Islands.
The species appears to be extinct now.
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According to another source this species is said to also inhabit Koror, Palau Islands as well as the island of Pohnpei in the Federated States of Micronesia, the specimens collected from there, however, are somewhat smaller that those from Guam. [1]
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References:
[1] O. F. von Moellendorff: The land shells of the Caroline Islands. Journal of Malacology 7: 101-126. 1900
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edited: 26.11.2018
Rotuma Amber Snail (Succinea rotumana)
The Rotuma Amber Snail is endemic is to the island of Rotuma, Fiji, including at least one of the offshore islets.
The species was described in 1897 based on six specimens that were collected on the island of Rotuma, another specimen was collected in 1938 on the offshore islet of Uea, this is also the last record for this species, that now is considered most likely extinct.
There is, however, the chance that the species indeed survives on Uea or one of the other offshore islets.
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References:
[1] Gilianne Brodie; Gary M. Bakker; Froseann Stevens; Monifa Fiu: Preliminary re-survey of the land snail fauna of Rotuma: conservation and biosecurity implications. Pacific Conservation Biology 20(1): 94-107. 2014
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edited: 26.11.2018