Saeronius Galapagos Snail (Naesiotus saeronius)

This species was described in 1917, it was restricted to the Isla Santa Cruz in the Galápagos archipelago.

The species was last seen in 1974; it could not be found alive during the last recent searches and might thus be extinct. 

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References: 

[1] William Healey Dall; Washington Henry Ochsner: Landshells of the Galapagos Islands. Proceedings of the California Academy of Sciences. Ser. 4. Vol. 17.: 141-185. 1928  

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edited: 01.06.2021