I did notice that and will be watching...my suspicion is that its more like a callous, if that is even possible on a tarantula. I just got a few new spiders, (this being one of them) and the substrate was dense and hard. I think it may be a combo of fat spider on a hard, coarse substrate.
I'll say female though, I have a C.fasciatum too at about 3 inches. She's in premolt now and probably maturing. Her epigastric furrow looks like a lot like yours except it's really dark and the hairs looks like they're combed down on it (kind of like the bangs on a bowl cut hairstyle)
^Yeah, just speculating until moult time...
I watched mine walk the side of the enclosure, when it flexed going around the corner the epigastric area became more exposed, I could see the distinct white furrow. If it is a male, my friend has a female, so it'll still be ok. And it was only $10.
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