As am I. The only way to know for sure, would be to check if both Color Forms can originate from the same egg-sac. Since a G. rosea grows at the same rate as a glacier, getting to the point where you can unequivocally determine whether or not this is the case is going to take a near eternity.

To clear up the RCF and NCF issue,
Basically from the hobby's perspective rosea and cala were originally thought to be 2 different species. If you had what is now called G. rosea rcf it was cala and if you had the normal colour form it was just rosea (or spatulata if you go back a bit). Then Gunter Schmidt came along and synonymised cala with rosea saying that cala was just a different colour form rather than an actual seperate species which is all fine and well. However the problem is Schmidt never examined any type specimens when he did this (i assume he looked at some pet trade stuff instead :roll: ) so he can not really say that what was originally described as cala really is the same as rosea. Rick West however has examined the type specimen of cala and is convinced that it is a seperate species to rosea but at the moment there is nothing in print about this as far as i'm aware.
So what does all that mean to us hobbyists just now? Well if your spider is the red form then it used to be called cala but is now G. rosea rcf and if your spider is the greyish brown form then it is just your normal G. rosea. Simple eh? Unfortunately not quite. A couple of years ago at the BTS lectures Fernando Perez-Miles mentioned something along the lines that what we have in the hobby as your normal G. rosea could very well be G. porteri and that the red form is actually G. rosea. As far as i'm aware he has a paper in prep on this so if you label your spiders then it is probably best to do so in pencil as there should be a fair bit of name changing going on in the near future.

Please post a picture of your spider so we can look at the problem. Grammostola's don't often kick of all their hair and go bold like some other species, unless it's a old mature male.

lol!

hey guys, i saw the t. dont have a camera with me but will put up a pic tommorrow.
It's not actually a bald spot, in fact there's still hairs there. But the skin looks flaky.
really alot like dandruff/dried out.
We changed it's living arrangements now - bigger tank, cleaned it out and added some slightly moist substrate, as it seemed to have been slightly neglected.
I think it dried out :S
It's also not eating, not sure if that's important, but from what I can see it seems to be way post molt.
has anyone experienced a dandruff t before?

Oh sorry it DID have a bold spot, but it's odd-looking condition(the flakes on the abdomen) seems to have cleared up, and she's looking healthy now as far as I can tell.
It hasn't eaten in more than 3 weeks though..

Hey Halfniak, don't worry about the flakes, it is usually the hair the tarantula flicks off that just gets stuck in all the other hairs, but it's is 100% healthy, and don't make the cage damp, just a water bowl since they are an arid species, very unlikely to dehydrate. The fasting is what they do all the time, don't worry about it, it will eat eventually

ok thanks, T-rad!