Tag Archives: Athearnia crassa

Athearnia crassa (Haldeman)

Boulder Snail (Athearnia crassa)

The Boulder Snail was described in 1842; it inhabited the Clinch- and the Powell rivers which are a part of a river system that spans over parts of Georgia, Iowa and Tennessee, USA.

The species is now extinct, the last remaining population of this species disappeared when the Tellico River was dammed in 1979 to create Lake Tellico.


The Boulder Snail is sometimes considered rediscovered, however, these accounts must be assigned to a closely related species, Anthony’s Boulder Snail (Athearnia anthonyi (Redfield)).


edited: 14.11.2021