Bithynia (Parafossarulus) crassitesta Parafossarulus crassitesta is an extinct species of freshwater snail with gills and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae.

Glöer (2002)[2] reassigned two European extinct species of Parafossarulus as a subgenus of the genus Bithynia, but genus Parafossarulus is generally accepted for Asian species.

This species occurred in Europe in the Pleistocene Epoch.

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