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Dear Stephen
I'm convinced that this must be a Thaumalaeidae. Although I can hardly see the head, the purplish spots on the abdomen as well as the detailed photo of the anal segment show a typical Thaumalaeidae. I photoshopped your photo and I marked the bilobed (dorsally placed) anal segment (with the spiracles) as well as the posterior pseudopod in ventral position. To me this is all typical of Thaumalaeidae.