Small Tree-Snail (Partula diminuta)
This species was described in 1851.
The Small Tree-Snail was restricted to the Pirae valley in northwestern Tahiti, Society Islands, which is now largely cleared for agriculture.
The species appears to have been last recorded in 1970, when it was already restricted to the uppermost parts of its former range. It is now extinct.
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References:
[1] Justin Gerlach: Icons of Evolution: Pacific Island Tree-Snails of the Family Partulidae. Phelsuma Press 2016
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(public domain)
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edited: 21.10.2017