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Thank you Iain.
Any suggestion to further this request.

Anyone who can help me with a key of Kowarzia species.

(Only Kowarzia bipunctata is listed so far for the Netherlands, but several others occur in neighbouring countries (source Fauna Europaea) and may be potential for our region such as K. barbatula, K. tenella, K. plectrum, K. madicola and K. tibiella.)