Fig. 1
From: Discrete or indiscrete? Redefining the colour polymorphism of the land snail Cepaea nemoralis

Sample sites across Europe, grouped by geographically contiguous regions. a (England, n = 397), b (Ireland, n = 144), c (North Spain and Pyrenees, n = 112), d (North France, Belgium, Germany, n = 178), e (Scandinavia, n = 77), f (Poland, n = 126). One final group, g, is all other samples (n = 138)