Theodoxus fluviatilis is considered holarctic, occurring in both the Nearctic and Palearctic biogeographic regions. However, they are more commonly seen in the Palearctic region, spreading far west to England, and east into southwestern Asia. Many patches within Europe are uninhabited, mainly the mountainous regions. This snail's ability to survive in freshwater allowed for migration throughout Eastern Europe, and later re-entry into the brackish waters of the Baltic Sea.
Biogeographic Regions: nearctic (Introduced ); palearctic (Native )
Other Geographic Terms: holarctic
- Bunje, P. 2005. Pan-European phylogeography of the aquatic snail Theodoxus fluviatilis (Gastropoda: Neritidae). Molecular Ecology, 14: 4323-4340. Accessed May 23, 2011 at http://paulbunje.com/pdfs/Bunje2005.pdf.
- Symanowski, F., J. Hildebrandt. 1984. Differences in osmotolerance in freshwater and brackish water populations of Theodoxus fluviatilis (Gastropoda: Neritidae) are associated with differential protein expression. Journal of Comparative Physiology, 180 (3): 337-346.
- Zettler, M., J. Frankowski, R. Bochert, M. Rohner. 2004. Morphological and ecological features of Theodoxus fluviatilis (Linnaeus, 1758) from Baltic brackish water and German freshwater populations. Journal of Conchology, 38 (3): 305-316. Accessed May 11, 2011 at http://www.io-warnemuende.de/tl_files/bio/ag-benthische-organismen/pdf/zettler_et_al-2004-theodoxus.pdf.