Abstract
In August 2021, two specimens of invasive oligochaete of tropical origin Branchiura sowerbyi were found in the Sheksna reservoir of the Vologda region (59°45ʹ21ʺN, 38°21ʹ28ʺE). For today, this is the northernmost finding of this species. Probably, this species penetrated with the ballast waters from the Don River lower course through the Volgo-Don canal and the Volgo-Baltic waterway. The temperature regime of the water bodies of the Vologda region allows reproduction of this oligohaeta.
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