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Hi,
Yesterday I saw this young Araneus diadematus spider in my garden. I took a photograph because of its nice colours and then noticed a yellow "swelling" on the side of its abdomen that is obviously a larva. I know Pompilid wasps burying paralyzed spiders with an added egg, but I did not know that unburied lively spiders can be attacked by parasitic larvae. Which insects can be such parasites?
Thanks for any information, Sundew