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Very interesting, thanks for the explanation. I have spent a good deal of time attempting to photograph posterior spiracles of puparia in various families as part of my studies of stem-dwelling insects. Unfortunately I don't have access to a good dissecting scope or similarly high-powered magnifying tool to really dive into the intricacies; the most detailed spiracle photos I get are a bit less zoomed-in than what you posted here. Best of luck with your latrine fauna investigations - it sounds like an intriguing line of study.