Note: That is a merely a general guide, and some species do not adhere to those conventions whatsoever, so it's always a good idea to google your genus and species followed by "ventral sexing." Chances are, someone on here has already had a specimen sexed and you can use that as a very good comparison to your specimen to get an idea of what you might have. But this T is clearly exhibiting female traits so I'm fairly confident in telling you that it's a female tarantula! The epigastric furrow lies along the curvature of the first pair of book lungs, which is usually a good indicator that it's a female. Male's book lungs tend to be closer together as you'll be able to see in that guide.