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Message: <blockquote data-quote="Chubbs" data-source="post: 58746" data-attributes="member: 1084">The "gunk" you're referring to are a pile urticating hairs that have been partially brushed off. When most species with them kick off the hairs, it comes off in sort of a cloud of hairs. It's not the entire hair that comes off usually, just fragments of them. There are several different types of urticating hairs. I don't remember all of the types, but most Avicularia for example cannot kick the hairs off, they must actually be pressed into the skin, where they break off. I believe Iridopelma are the same. Then we have Ephebopus that have the hairs on the pedipalps which they flick off by rubbing them against their chelicerae.The indentation in the carapace is called the fovea, which is an internal attachment point for muscles. Hope this helps.</blockquote>