I am wondering whether acari moult. For instance the Red Velvet mite. The few information that I've gathered so far is that "all arthropods molt", which seems to imply that all acari do molt. And that "most arthropods moult" which is totally different from what I had started to read. Asking this question directly to google did not return an all cooked answer. Thank you for any "trustable" information. P.S.:Now that I've read that spiders molt, I remember having saw a cellar spider exoskeleton. And I've taken a photo of a loxosceles (laeta I think) exoskeleton. Previously I thought they were dead spiders, but now I know they were quite likely exoskeleton resulting from moulting.