Rapa Nui Nesopupa Snail (Nesopupa sp.)  

This snail is known from a single specimen that was collected in 1991 during excavations at Anakena at the north coast of Rapa Nui. [1]

The Rapa Nui taxon was certainly an endemic species that is now extinct. 

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References: 

[1] Patrick V. Kirch; Carl C. Christensen; David W. Steadman: Subfossil Land Snails from Easter Island, Including Hotumatua anakenana, New Genus and Species (Pulmonata: Achatinellidae). Pacific Science, 63: 105–122. 2009

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edited: 11.12.2018