Invasion

Invasion Description

1st record: Copenhagen/Denmark/Oresund (1953, Jensen and Knudsen 2005, failed; 2008, Tendal et al. 2011, established)

Tendal, Ole Secher; Olesen, Jorgen; Soeborg Lundholm, Beth (2011). [Estuarine mud crab (Harris mud crab, white-fingered mud crab) in Denmark: old guest and new invasive species.] Den ostamerikanske brakvandskrabbe Rhithropanopeus harrisii i Danmark: Gammel gaest og ny invasiv art. Flora og Fauna. 2011 April; 117(1):23-26

Abstract: Rhithropanopeus harrisii has been recognized in Europe since 1949. It was, however, introduced from the American east coast at least 75 years earlier, but was described and became known under another name, the Zuidersee crab (Pilumnus tridentatus Maitland, 1874). In Denmark it was found for the first time in 1953 in the harbour of Copenhagen. It seems to have been absent for more than 50 years, until it turned up again in 2008 in southern Denmark (Nysted Nor, the Baltic coast of Lolland) and around Copenhagen. It was reported also in 2009 and 2010 from the earlier known localities and some new in southern Zealand. A specimen with 28 mm carapace width is the largest ever recorded for the species.

Geographic Extent

Copenhagen/Denmark/Oresund (1953, Jensen and Knudsen 2005, no further records until 2008, Tendal et al. 2011); Copenhagen/Denmark/Frederiksholm Harbor, S Part (7-2-54, USNM 231715, US National Museum of Natural History 2008, failed); southern Sjaeland/Denmark/Baltic Sea (2009, Tendal et al. 2011); Germany/Darss-Zingel Lagoons (Nehring 2000)