Recently Pontogammarus robustoides, a Ponto-Caspian amphipod species that has invaded Baltic lagoons and lower Vistula River at the end of 20lh century, abundantly appeared in some water bodies of the Great Masurian Lakes area.
In a small piece of Baltic amber several poorly preserved amphipod crustaceans were found. The most probable seems to be the affinity of these amphipods to the freshwater family Crangonyctidae.
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