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I photographed this small crab spider c 8mm body on Wild marjoram in early September in Wiltshire UK. Xysticus for sure, but not one I've seen before. It matches X acerbus best from images I can find, although that species is quite rarely recorded in the UK, just once from this county and seems to more usually be a ground living species. It's a difficult genus to ID from photos alone, so guess Xysticus sp. is the best ID for it, but maybe an expert could be more definitive?