|Abundance||scarce (very unlikely)||Ref.||Winkler, H.M., K. Skora, R. Repecka, M. Ploks, A. Neelov, L. Urho, A. Gushin and H. Jespersen, 2000|
Reached westwards to the German Baltic coast in 2002 (Ref. 59043). Recorded in Dutch Rhine delta in 2004 and upper German Rhine near the city of Zons in 2008 (Ref. 86622). Found in Rhine River near the city of Rees (Rhine-km 843) in 2010 (Ref. 88692). Also Ref. 94072.