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Hi Jürgen, thank you, seems to be right.
On a well-known German photographer's website I just read as a caption "T. cf. lateralis", but otherwise on a dutch site another photographer wrote, T. lateralis would be very easy to identify. So who's right...(it seems that none of them is an expert) - are there similar species?
Maybe someone can answer this.
Greetings,
Lennart