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Here's my grammastolla pulchripes immature female. Photo points out the gonoslit. This sexing was confirmed by examining her shed skin. She is about 4.5" now but is was able to sex her at 3.5".
What do you think now? I've a clear photo shot of her abdomen too me in my eyes she looks like she has that (yes I'm being really careful and watching her)
Tara I took the liberty of tweaking your photo in iPhoto. Based on this photo with a gun to my head, I would say its a male. If you look between the anterior book lungs there appears to be a small round spot. I'm 75% sure it's male but to be 100% sure you'd have to examine the next molted skin.
Tara, you appear to have a male. The epiandrous fussilae is clearly visible. That said, Ventral sexing is not 100% accurate and I would wait for a molt to confirm.