White-lipped Amastra Snail (Amastra albolabris)  

This species was described in 1853, it was restricted to the Wai’anae Mountains in western O’ahu, Hawaiian Islands, where it appears to have been quite common and widespread.  

The shells reached sizes of about 1,3 to 1,6 cm.  

The White-lipped Amastra Snail is now considered extinct, like most of its congeners.  

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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: 27.09.2017