Chromatopelma cyaneopubescens
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Chromatopelma cyaneopubescens

Hello to everyone!
I bought this as a determined female but the owner wasn't 100% sure because of the size of the last molt. She told me to call her if there are any problems. But when I look at it now, it looks pretty male to me.What do you think?
Looks pretty female to me actually. The upper book lungs are more spaced out compared to how they would be on a male GBB. Also, that white "dot" that I think is making you think male, is the gonoslit, or a glare, or skin pigmentation, not the males epiandrous fusillade "dark patch"/ "dot".
 
Thanks. You made my day. Obviously, my "white dot" theory doesn't work. I fully ignored the other signs because of the "dot". I was so certain in it because I've sexed pretty accurate most of my brachypelmas this way, but almost all I have are males, so there's nothing to compare to. From what I have seen, in small juvenile males, the place where the epiandrous fusillae are is whitish in color, but here the location is different. About the lung thing: doesn't that place change size when the tarantula has eaten and its abdomen has become larger? And also, from what I have seen on the web about GBB, the female's furrow is nice and round, while the males have a little curve pointing upwards. This is visible on this specimen, too. What do you think?
 
Both my MM P. Irminias had a 'white dot' before they matured, but where the epiandrous fussilae would be located.. but I guess this is species dependant, not one of them had a dark dot.. my other one didn't even have a break, had trouble sexing it until it eventually matured.

When it comes to the space between the anterior booklungs I think it's also species dependant, it becomes useful if you have familiarised yourself with the vents of both males and females of a certain species. For instance in the psalmo genus there isn't much difference in the space between the anterior booklungs of different genders of the same size and species IME, where in brachypelma you would see the difference clearly.

Regarding the notch, not all males have those, my one MM irminia didn't have a notch, again adding to the frustration of the difficulty vent sexing it, whereas my other MM irminia had a very visible notch, these notches are quite tiny, some females may have a furrow that tend to rise in the middle.

What you are referring to on your specimen as a 'notch' I think is a vent opening which again indicates female. Obviously molt sexing would be the only foolproof way, but if you are still uncertain, maybe a pic with more light? (no glare though), but I'm strongly leaning towards female on this one :)
 
looks verry fem comparing it to my males pics[have 2]. . havnt tried my fem she came to me guaranteed molt sexed from a guy i trust here and then moltied a few months later ^_^ but def leanin fem
 
Thanks for all the replies! They've been very helpful. I was confused because I've seen ventral pics of males and females from this species and none of the females had a white spot like this. Actually, I rarely make sex guesses before looking at several pictures of a certain species and get familiar with the differences. About the space between the lungs: I know that it is different in different species. My question actually was if the width changes when the tarantula's abdomen is smaller and larger. For example: a freshly molted male's furrow isn't very wide, but after he eats several times and his abdomen becomes larger, does the furrow also become wider? Unfortunately, this is the best picture I can do because of the plastic box and also the tarantula's too fast to pinch grab it. I'll wait for the molt and then post the results here.
 
Nah I don't think it stretches, I think the anterior booklungs might be more visible with a fatter T. And yeah rather not pinch grab hehe ;-P
 
Thanks for the reply. I'll check that myself with the males I care for. The tarantula was slower at first when I got it but it was a bit cold outside. It became faster after it warmed up. I once tried to pinch grab a large female Hysterocrates so I could see better her underside and I'm not trying this again.O_O Nothing serious happened but an incident could have occurred.
 

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Epiandrous fusillae sexing (Not Molts)
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