The Hachijojima Snail was described in 1945; it is, or maybe was, restricted to the island of Hachijojima in the Izu Islands group, Japan.
The species is considered extinct since 2016. [1]
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References:
[1] Robert H. Cowie; Claire Régnier; Benoît Fontaine; Philippe Bouchet. Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41. 2017
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edited: 08.05.2022
Hatai’s Boninea Snail (Boninena hataii)
Hatai’s Boninea Snail was described in 1973 on the basis of (sub)fossil shells that were recovered from deposits on the island of Minaijima in the Ogasawara archipelago, Japan.
The shells reach heights of about 1.3 cm; they are light brown, fusiform in shape with a highly conical spire of seven whorls and differ from those of their living relatives by being solid with a conical elevated spire and a large blunt apex. [1]
The species very likely disappeared before any humans set foot on the island caused by naturally occurring climatic changes.
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References:
[1] Tadashige Habe: Fossil land snails from Minami-jima, Bonin Islands. Science Reports of the Tohoku University, Special Volume 6 (Hatai Memorial Volume): 51-53. 1973
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edited: 27.02.2024
Gran Canaria Napaeus Snail (Napaeus indifferens)
This species was described in 1872, known only by subfossil shells that look quite fresh, however, so it might have become extinct quite recently or might turn out to be still alive.
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edited: 13.09.2020