Markus,

I have only generalized data about the northern range of T. fluviatilis, but
I believe that two publications might provide you with the best overview of
the range of T. fluviatilis.  There are certainly many other papers, but
nothing comes specifically to mind at present.  Try:

Bunje, Paul. "Pan-European Phylogeography of the Aquatic Snail Theodoxus
Fluviatilis (Gastropoda: Neritidae)." Molecular Ecology 14 (2005): 4323-40.

Bunje, Paul M. E., and David R. Lindberg. "Lineage Divergence of a
Freshwater Snail Clade Associated With Post-Tethys Marine Basin
Development." Molecular Phylogenetics and Evolution 42.2002 (2007): 373-87.

Tom Eichhorst

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