The Squaremouth Amnicola was described in 1968; it was found in rivers and streams west of the St. John’s River in eastern Florida, USA, it appears to have been restricted to certain types of waterways with sandy bottoms.

The species was not found at the known sites during the last surveys and is now thought to be possibly extinct.

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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: 27.01.2022