most uroplatus eggs take 90 days to hatch, at least from what i've experienced. thenagain i dont have guentheri. just keep patient, and im sure it'll hatch. my uroplatus eggs always get dark when theres actually an embryo inside. hard-shelled eggs won't grow at all. just keep incubating, and hopefully youll have some more guentheri soon!
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-Mike Martin
North Carolina