which are probably several million years old and reproductively
isolated [14], but morphologically not clearly distinct [36]. In
Central Europe, the two most commonly detected species (type A
and type B) differ in their geographical distribution, with an
eastern type A and a western type B, but their distribution ranges
overlap in a contact zone within the Rhine drainage in Germany
and Switzerland [14,35,37].
which are probably several million years old and reproductivelyisolated [14], but morphologically not clearly distinct [36]. InCentral Europe, the two most commonly detected species (type Aand type B) differ in their geographical distribution, with aneastern type A and a western type B, but their distribution rangesoverlap in a contact zone within the Rhine drainage in Germanyand Switzerland [14,35,37].
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